#!/usr/bin/env bash
# gstack setup — build browser binary + register skills with Claude Code / Codex
set -e
umask 077  # Restrict new files to owner-only (0o600 files, 0o700 dirs)

usage() {
  cat <<'EOF'
gstack setup — install gstack skills + build browse binary

Usage: ./setup [options]

Options:
  --host <name>     Install for a specific host (claude, codex, kiro, factory,
                    opencode, openclaw, hermes, gbrain, auto). Default: claude.
  --prefix          Install skills with the gstack- prefix (e.g. /gstack-review).
  --no-prefix       Install skills with short names (e.g. /review). Default.
  --team            Switch to team mode (per-repo gstack with auto-update).
  --no-team         Force solo install even if a team-mode repo is detected.
  -q, --quiet       Suppress progress output.
  -h, --help        Show this help and exit.

Examples:
  ./setup                          # solo install for Claude Code
  ./setup --host codex             # install for OpenAI Codex CLI
  ./setup --team                   # team mode for a shared repo
  ./setup --no-prefix              # use short slash-command names

Docs: https://github.com/garrytan/gstack
EOF
}

# Short-circuit on -h/--help before any environment checks so users can
# discover flags even without bun installed.
for _arg in "$@"; do
  case "$_arg" in
    -h|--help) usage; exit 0 ;;
  esac
done

if ! command -v bun >/dev/null 2>&1; then
  echo "Error: bun is required but not installed." >&2
  echo "Install with checksum verification:" >&2
  echo '  BUN_VERSION="1.3.10"' >&2
  echo '  tmpfile=$(mktemp)' >&2
  echo '  curl -fsSL "https://bun.sh/install" -o "$tmpfile"' >&2
  echo '  echo "Verify checksum before running: shasum -a 256 $tmpfile"' >&2
  echo '  BUN_VERSION="$BUN_VERSION" bash "$tmpfile" && rm "$tmpfile"' >&2
  exit 1
fi

INSTALL_GSTACK_DIR="$(cd "$(dirname "$0")" && pwd)"
SOURCE_GSTACK_DIR="$(cd "$(dirname "$0")" && pwd -P)"
INSTALL_SKILLS_DIR="$(dirname "$INSTALL_GSTACK_DIR")"
BROWSE_BIN="$SOURCE_GSTACK_DIR/browse/dist/browse"
CODEX_SKILLS="$HOME/.codex/skills"
CODEX_GSTACK="$CODEX_SKILLS/gstack"
FACTORY_SKILLS="$HOME/.factory/skills"
FACTORY_GSTACK="$FACTORY_SKILLS/gstack"
OPENCODE_SKILLS="$HOME/.config/opencode/skills"
OPENCODE_GSTACK="$OPENCODE_SKILLS/gstack"
CURSOR_SKILLS="$HOME/.cursor/skills"
CURSOR_GSTACK="$CURSOR_SKILLS/gstack"

IS_WINDOWS=0
case "$(uname -s)" in
  MINGW*|MSYS*|CYGWIN*|Windows_NT) IS_WINDOWS=1 ;;
esac

# Windows: binaries are compiled with .exe suffix
if [ "$IS_WINDOWS" -eq 1 ]; then
  BROWSE_BIN="$SOURCE_GSTACK_DIR/browse/dist/browse.exe"
fi

# ─── Symlink-or-copy helper ───────────────────────────────────
# On macOS/Linux: create a symlink (existing behavior).
# On Windows without Developer Mode (MSYS2/Git Bash): plain ln -snf silently
# creates a frozen file copy that doesn't refresh after `git pull`. We use
# explicit `cp -R` / `cp -f` so the user gets a real copy and the staleness
# is reportable (re-run ./setup after pull). Auto-detects file vs dir.
#
# INVARIANT: every symlink in this script MUST route through this helper.
# A raw ln call here will be caught by test/setup-windows-fallback.test.ts
# (the static-invariant assertion D7).
_link_or_copy() {
  local src="$1"
  local dst="$2"
  if [ "$IS_WINDOWS" -eq 1 ]; then
    rm -rf "$dst"
    # Unix `ln -snf` accepts a name-only or relative-path source even when the
    # target doesn't resolve from CWD (e.g. the connect-chrome alias points at
    # the sibling-relative "gstack/open-gstack-browser"). On Windows the
    # equivalent semantics don't exist — we'd need a real source on disk to
    # copy. Skip the alias quietly rather than aborting setup under `set -e`.
    if [ ! -e "$src" ]; then
      return 0
    fi
    if [ -d "$src" ]; then
      cp -R "$src" "$dst"
    else
      cp -f "$src" "$dst"
    fi
  else
    ln -snf "$src" "$dst"
  fi
}

# ─── Ownership gates for the Windows refresh bypass (#2444 → #2142) ─────────
# On Windows a refresh means rm -rf + re-copy (_link_or_copy). The host
# skills dirs are SHARED namespaces (~/.codex/skills, ~/.factory/skills,
# ~/.cursor/skills, ...), so a gstack* glob name can collide with a user's
# OWN real directory (e.g. ~/.cursor/skills/gstack-notes) — deleting it on
# every ./setup re-run is silent data loss. Mirror of bin/gstack-uninstall's
# provenance gate (#2563): an existing REAL skill dir may only be replaced
# when its SKILL.md carries the generated banner. Missing targets and
# symlinks always pass (replacing a link never destroys content); non-dir
# targets pass (file targets live inside gstack-owned roots).
_owned_for_windows_refresh() {
  local dst="$1"
  if [ ! -e "$dst" ] && [ ! -L "$dst" ]; then return 0; fi
  if [ -L "$dst" ]; then return 0; fi
  if [ ! -d "$dst" ]; then return 0; fi
  grep -q '<!-- AUTO-GENERATED from' "$dst/SKILL.md" 2>/dev/null
}

# A sidecar/runtime ROOT (…/skills/gstack) is provably USER-owned when it is
# a real dir whose SKILL.md exists but lacks the generated banner — a
# hand-written skill squatting on the canonical name. The sidecar installers
# skip it entirely rather than write into (or wipe) someone else's skill.
# A root with NO SKILL.md stays presumed ours: it is the documented gstack
# install location and old/partial installs legitimately look like that.
_sidecar_root_user_owned() {
  local root="$1"
  [ -d "$root" ] || return 1
  [ -L "$root" ] && return 1
  [ -f "$root/SKILL.md" ] || return 1
  ! grep -q '<!-- AUTO-GENERATED from' "$root/SKILL.md" 2>/dev/null
}

# Swap a freshly-rendered tmp dir into the live render location (#2569
# hardening). Installed skills SYMLINK into the live dir, so it is only ever
# replaced AFTER a successful render — a failed render leaves the previous
# render (and every link into it) fully intact. Keep in sync with
# bin/gstack-config's _swap_in_render (same contract, both pinned by
# test/user-render-out-dir-install.test.ts).
_swap_in_render() {
  local render_dir="$1" render_tmp="$2"
  local render_old="$render_dir.old.$$"
  rm -rf "$render_old"
  if [ -e "$render_dir" ] || [ -L "$render_dir" ]; then mv "$render_dir" "$render_old"; fi
  mv "$render_tmp" "$render_dir"
  rm -rf "$render_old"
}

_WINDOWS_COPY_NOTE_PRINTED=0
_print_windows_copy_note_once() {
  if [ "$IS_WINDOWS" -eq 1 ] && [ "$_WINDOWS_COPY_NOTE_PRINTED" -eq 0 ]; then
    echo "  note: Windows install uses file copies (no Developer Mode required). Re-run ./setup after every 'git pull' to refresh skill files."
    _WINDOWS_COPY_NOTE_PRINTED=1
  fi
}

# ─── Quiet mode helper ────────────────────────────────────────
QUIET=0
log() { [ "$QUIET" -eq 0 ] && echo "$@" || true; }

# ─── Parse flags ──────────────────────────────────────────────
HOST="claude"
LOCAL_INSTALL=0
SKILL_PREFIX=1
SKILL_PREFIX_FLAG=0
TEAM_MODE=0
NO_TEAM_MODE=0
PLAN_TUNE_HOOKS_MODE=""   # "" = resolve from env/config/prompt; "yes"/"no" = explicit
while [ $# -gt 0 ]; do
  case "$1" in
    --host) [ -z "$2" ] && echo "Missing value for --host (expected claude, codex, kiro, factory, opencode, cursor, slate, openclaw, hermes, gbrain, or auto)" >&2 && exit 1; HOST="$2"; shift 2 ;;
    --host=*) HOST="${1#--host=}"; shift ;;
    --local) LOCAL_INSTALL=1; shift ;;
    --prefix)    SKILL_PREFIX=1; SKILL_PREFIX_FLAG=1; shift ;;
    --no-prefix) SKILL_PREFIX=0; SKILL_PREFIX_FLAG=1; shift ;;
    --team)    TEAM_MODE=1; shift ;;
    --no-team) NO_TEAM_MODE=1; shift ;;
    --plan-tune-hooks)    PLAN_TUNE_HOOKS_MODE="yes"; shift ;;
    --no-plan-tune-hooks) PLAN_TUNE_HOOKS_MODE="no"; shift ;;
    --plan-tune-hooks=*)  PLAN_TUNE_HOOKS_MODE="${1#--plan-tune-hooks=}"; shift ;;
    -q|--quiet) QUIET=1; shift ;;
    *) shift ;;
  esac
done

case "$HOST" in
  claude|codex|kiro|factory|opencode|cursor|slate|auto) ;;
  openclaw)
    echo ""
    echo "OpenClaw integration uses a different model — OpenClaw spawns Claude Code"
    echo "sessions natively via ACP. gstack provides methodology artifacts, not a"
    echo "full skill installation."
    echo ""
    echo "To integrate gstack with OpenClaw:"
    echo "  1. Tell your OpenClaw agent: 'install gstack for openclaw'"
    echo "  2. Or generate artifacts: bun run gen:skill-docs --host openclaw"
    echo "  3. See docs/OPENCLAW.md for the full architecture"
    echo ""
    exit 0 ;;
  hermes)
    echo ""
    echo "Hermes integration uses the same model as OpenClaw — Hermes spawns"
    echo "Claude Code sessions, and gstack provides methodology artifacts."
    echo ""
    echo "To integrate gstack with Hermes:"
    echo "  1. Tell your Hermes agent: 'install gstack for hermes'"
    echo "  2. Or generate artifacts: bun run gen:skill-docs --host hermes"
    echo ""
    exit 0 ;;
  gbrain)
    echo ""
    echo "GBrain is a mod for gstack — it makes coding skills brain-aware."
    echo "GBrain generates brain-enhanced skill variants that search your brain"
    echo "for context before starting and save results after finishing."
    echo ""
    echo "To generate brain-aware skills:"
    echo "  bun run gen:skill-docs --host gbrain"
    echo ""
    echo "GBrain setup and brain skills ship from the GBrain repo."
    echo ""
    exit 0 ;;
  *) echo "Unknown --host value: $HOST (expected claude, codex, kiro, factory, opencode, cursor, slate, openclaw, hermes, gbrain, or auto)" >&2; exit 1 ;;
esac

# ─── Resolve skill prefix preference ─────────────────────────
# Priority: CLI flag > saved config > interactive prompt (or flat default for non-TTY)
GSTACK_CONFIG="$SOURCE_GSTACK_DIR/bin/gstack-config"
export GSTACK_SETUP_RUNNING=1  # Prevent gstack-config post-set hook from triggering relink mid-setup
if [ "$SKILL_PREFIX_FLAG" -eq 0 ]; then
  _saved_prefix="$("$GSTACK_CONFIG" get skill_prefix 2>/dev/null || true)"
  if [ "$_saved_prefix" = "true" ]; then
    SKILL_PREFIX=1
  elif [ "$_saved_prefix" = "false" ]; then
    SKILL_PREFIX=0
  else
    # No saved preference — prompt interactively (or default flat for non-TTY/quiet)
    if [ "$QUIET" -eq 1 ]; then
      SKILL_PREFIX=0
    elif [ -t 0 ]; then
      echo ""
      echo "Skill naming: how should gstack skills appear?"
      echo ""
      echo "  1) Short names: /qa, /ship, /review"
      echo "     Recommended. Clean and fast to type."
      echo ""
      echo "  2) Namespaced: /gstack-qa, /gstack-ship, /gstack-review"
      echo "     Use this if you run other skill packs alongside gstack to avoid conflicts."
      echo ""
      printf "Choice [1/2] (default: 1, auto-selects in 10s): "
      read -t 10 -r _prefix_choice </dev/tty 2>/dev/null || _prefix_choice=""
      case "$_prefix_choice" in
        2) SKILL_PREFIX=1 ;;
        *) SKILL_PREFIX=0 ;;
      esac
    else
      SKILL_PREFIX=0
    fi
    # Save the choice for future runs
    "$GSTACK_CONFIG" set skill_prefix "$([ "$SKILL_PREFIX" -eq 1 ] && echo true || echo false)" 2>/dev/null || true
  fi
else
  # Flag was passed explicitly — persist the choice
  "$GSTACK_CONFIG" set skill_prefix "$([ "$SKILL_PREFIX" -eq 1 ] && echo true || echo false)" 2>/dev/null || true
fi

# --local: install to .claude/skills/ in the current working directory (deprecated)
if [ "$LOCAL_INSTALL" -eq 1 ]; then
  echo "Warning: --local is deprecated. Use global install + --team instead." >&2
  echo "  See: https://github.com/garrytan/gstack#team-mode" >&2
  if [ "$HOST" = "codex" ]; then
    echo "Error: --local is only supported for Claude Code (not Codex)." >&2
    exit 1
  fi
  INSTALL_SKILLS_DIR="$(pwd)/.claude/skills"
  mkdir -p "$INSTALL_SKILLS_DIR"
  HOST="claude"
  INSTALL_CODEX=0
fi

# For auto: detect which agents are installed
INSTALL_CLAUDE=0
INSTALL_CODEX=0
INSTALL_KIRO=0
INSTALL_FACTORY=0
INSTALL_OPENCODE=0
INSTALL_CURSOR=0
if [ "$HOST" = "auto" ]; then
  command -v claude >/dev/null 2>&1 && INSTALL_CLAUDE=1
  command -v codex >/dev/null 2>&1 && INSTALL_CODEX=1
  command -v kiro-cli >/dev/null 2>&1 && INSTALL_KIRO=1
  command -v droid >/dev/null 2>&1 && INSTALL_FACTORY=1
  command -v opencode >/dev/null 2>&1 && INSTALL_OPENCODE=1
  # Cursor's `cursor` CLI shim isn't always on PATH; ~/.cursor is the
  # reliable footprint of an installed Cursor IDE.
  command -v cursor >/dev/null 2>&1 && INSTALL_CURSOR=1
  [ -d "$HOME/.cursor" ] && INSTALL_CURSOR=1
  # If none found, default to claude
  if [ "$INSTALL_CLAUDE" -eq 0 ] && [ "$INSTALL_CODEX" -eq 0 ] && [ "$INSTALL_KIRO" -eq 0 ] && [ "$INSTALL_FACTORY" -eq 0 ] && [ "$INSTALL_OPENCODE" -eq 0 ] && [ "$INSTALL_CURSOR" -eq 0 ]; then
    INSTALL_CLAUDE=1
  fi
elif [ "$HOST" = "claude" ]; then
  INSTALL_CLAUDE=1
elif [ "$HOST" = "codex" ]; then
  INSTALL_CODEX=1
elif [ "$HOST" = "kiro" ]; then
  INSTALL_KIRO=1
elif [ "$HOST" = "factory" ]; then
  INSTALL_FACTORY=1
elif [ "$HOST" = "opencode" ]; then
  INSTALL_OPENCODE=1
elif [ "$HOST" = "cursor" ]; then
  INSTALL_CURSOR=1
fi

migrate_direct_codex_install() {
  local gstack_dir="$1"
  local codex_gstack="$2"
  local migrated_dir="$HOME/.gstack/repos/gstack"

  [ "$gstack_dir" = "$codex_gstack" ] || return 0
  [ -L "$gstack_dir" ] && return 0

  mkdir -p "$(dirname "$migrated_dir")"
  if [ -e "$migrated_dir" ] && [ "$migrated_dir" != "$gstack_dir" ]; then
    echo "gstack setup failed: direct Codex install detected at $gstack_dir" >&2
    echo "A migrated repo already exists at $migrated_dir; move one of them aside and rerun setup." >&2
    exit 1
  fi

  log "Migrating direct Codex install to $migrated_dir to avoid duplicate skill discovery..."
  mv "$gstack_dir" "$migrated_dir"
  SOURCE_GSTACK_DIR="$migrated_dir"
  INSTALL_GSTACK_DIR="$migrated_dir"
  INSTALL_SKILLS_DIR="$(dirname "$INSTALL_GSTACK_DIR")"
  BROWSE_BIN="$SOURCE_GSTACK_DIR/browse/dist/browse"
  # Windows: binaries are compiled with .exe suffix (same as the top-level
  # BROWSE_BIN assignment — this re-derivation must not drop the suffix).
  if [ "$IS_WINDOWS" -eq 1 ]; then
    BROWSE_BIN="$SOURCE_GSTACK_DIR/browse/dist/browse.exe"
  fi
}

if [ "$INSTALL_CODEX" -eq 1 ]; then
  migrate_direct_codex_install "$SOURCE_GSTACK_DIR" "$CODEX_GSTACK"
fi

# Kill an entire process tree rooted at $1, leaves first. Killing only the
# backgrounded subshell orphans the wedged node/bun -> Chromium probe
# processes underneath it — re-creating the #2136 stuck-process pile-up and
# potentially leaving Playwright cache locks held. macOS ships no setsid
# binary, so a portable group-kill isn't available; walk `pgrep -P` children
# depth-first instead (pgrep exists on macOS and Linux). Falls back to a
# plain kill of the root pid when pgrep is unavailable.
_kill_tree() {
  local pid="$1" child
  if command -v pgrep >/dev/null 2>&1; then
    for child in $(pgrep -P "$pid" 2>/dev/null); do
      _kill_tree "$child"
    done
  fi
  kill -9 "$pid" 2>/dev/null || true
}

# Deadline-bounded wait for a background probe. macOS ships no GNU timeout;
# poll the PID and SIGKILL the whole probe tree past the deadline. Returns
# the probe's exit code, or 124 on timeout.
_wait_with_deadline() {
  local pid="$1" deadline_s="$2" waited=0
  while kill -0 "$pid" 2>/dev/null; do
    if [ "$waited" -ge "$deadline_s" ]; then
      _kill_tree "$pid"
      wait "$pid" 2>/dev/null || true
      return 124
    fi
    sleep 1
    waited=$((waited + 1))
  done
  wait "$pid"
}

ensure_playwright_browser() {
  # #2136: fresh installs hung forever at this probe (macOS arm64) and
  # re-runs stacked stuck process trees, so skills never got linked. Two
  # fixes: prefer Node for the launch probe everywhere it exists (the
  # bun --eval launch is the same pipe-bug family already worked around on
  # Windows), and bound the probe with a 90s deadline — a wedged probe now
  # reports failure (which routes to the install path) instead of hanging
  # setup.
  local probe_cmd
  if command -v node >/dev/null 2>&1; then
    probe_cmd='node -e "const { chromium } = require((process.cwd()) + \"/node_modules/playwright\"); (async () => { const b = await chromium.launch(); await b.close(); })().then(() => process.exit(0), () => process.exit(1))"'
  elif [ "$IS_WINDOWS" -eq 1 ]; then
    echo "gstack setup failed: Node.js is required on Windows" >&2
    return 1
  else
    probe_cmd="bun --eval 'import { chromium } from \"playwright\"; const browser = await chromium.launch(); await browser.close();'"
  fi
  (
    cd "$SOURCE_GSTACK_DIR"
    eval "$probe_cmd"
  ) >/dev/null 2>&1 &
  _wait_with_deadline $! 90
}

# P0 #2554: a macOS XProtect definition update can start SIGKILLing the
# Chromium revision the lockfile pins, which surfaces here as a failed launch
# probe. Clear com.apple.quarantine on the Playwright cache bundles ONLY —
# never a GSTACK_CHROMIUM_PATH bundle (that belongs to the wrapper/embedder;
# same scope contract as browse's probePoisonedChromiumBundle) — so the
# reinstall below produces a launchable browser. Best-effort and macOS-only.
_clear_playwright_quarantine() {
  [ "$(uname -s)" = "Darwin" ] || return 0
  local cache_root="${PLAYWRIGHT_BROWSERS_PATH:-$HOME/Library/Caches/ms-playwright}"
  [ -d "$cache_root" ] || return 0
  local d
  for d in "$cache_root"/chromium-* "$cache_root"/chromium_headless_shell-*; do
    [ -d "$d" ] || continue
    echo "  clearing com.apple.quarantine on $(basename "$d") (XProtect self-heal, #2554)" >&2
    xattr -dr com.apple.quarantine "$d" 2>/dev/null || true
  done
}

# Ensure a color-emoji font is installed (Linux only).
#
# Chromium renders emoji code points as .notdef "tofu" (▯) when no color-emoji
# font is installed. macOS ships "Apple Color Emoji" and Windows ships "Segoe UI
# Emoji", so they're fine out of the box. Most Linux distros and containers ship
# NO color-emoji font, which is why make-pdf output shows tofu in headers/tables
# that contain emoji. Install Noto Color Emoji to fix it.
#
# Best-effort: warn (don't fail) if we can't install — PDFs still generate, they
# just fall back to tofu for emoji as before. Skip entirely with
# GSTACK_SKIP_FONTS=1 (CI without sudo, managed machines, offline envs).
#
# Returns 0 and sets EMOJI_FONT_INSTALLED=1 when it actually installs a font.
EMOJI_FONT_INSTALLED=0
ensure_emoji_font() {
  # macOS/Windows ship a color-emoji font; nothing to do.
  [ "$(uname -s)" = "Linux" ] || return 0
  [ "${GSTACK_SKIP_FONTS:-0}" = "1" ] && return 0

  # Idempotency: a real COLOR emoji font that resolves for an actual emoji code
  # point (U+1F600). `fc-list :lang=und-zsye` is too broad — it matches symbol
  # and last-resort fallback fonts — so we use fc-match and require color=True.
  if command -v fc-match >/dev/null 2>&1; then
    if fc-match -f '%{family[0]}\t%{color}\n' ':lang=und-zsye:charset=1F600' 2>/dev/null | grep -qi 'True'; then
      return 0
    fi
  fi

  local sudo=""
  if [ "$(id -u)" -ne 0 ] && command -v sudo >/dev/null 2>&1; then
    # -n: never prompt. If a password is required we fail fast into the
    # warn-not-fail path below instead of hanging a non-interactive setup.
    sudo="sudo -n"
  fi

  # Every package-manager call is wrapped in `timeout` so a stuck dpkg/rpm lock
  # or a wedged mirror fails fast into the warn path instead of hanging setup.
  if command -v apt-get >/dev/null 2>&1; then
    echo "Installing color-emoji font (fonts-noto-color-emoji) so make-pdf emoji render (set GSTACK_SKIP_FONTS=1 to skip)..."
    DEBIAN_FRONTEND=noninteractive timeout 30 $sudo apt-get update -qq >/dev/null 2>&1 || true
    DEBIAN_FRONTEND=noninteractive timeout 120 $sudo apt-get install -y -qq fonts-noto-color-emoji >/dev/null 2>&1 || return 1
  elif command -v dnf >/dev/null 2>&1; then
    echo "Installing color-emoji font (google-noto-color-emoji-fonts)..."
    timeout 120 $sudo dnf install -y google-noto-color-emoji-fonts >/dev/null 2>&1 || return 1
  elif command -v pacman >/dev/null 2>&1; then
    echo "Installing color-emoji font (noto-fonts-emoji)..."
    timeout 120 $sudo pacman -Sy --noconfirm noto-fonts-emoji >/dev/null 2>&1 || return 1
  elif command -v apk >/dev/null 2>&1; then
    echo "Installing color-emoji font (font-noto-emoji)..."
    timeout 120 $sudo apk add --no-cache font-noto-emoji >/dev/null 2>&1 || return 1
  else
    return 1
  fi

  # Refresh fontconfig cache so Chromium picks up the new font. Run under sudo
  # for the system cache dirs (unprivileged fc-cache fails on unwritable dirs).
  if command -v fc-cache >/dev/null 2>&1; then
    $sudo fc-cache -f >/dev/null 2>&1 || fc-cache -f >/dev/null 2>&1 || true
  fi
  EMOJI_FONT_INSTALLED=1
  return 0
}

# After a fresh font install, stop any running browse render daemon so the next
# make-pdf render spawns a fresh Chromium that sees the new font. Chromium
# caches its font list at process start, so a daemon that was alive before the
# install would keep emitting tofu. `browse stop` is the graceful API; the
# daemon auto-respawns on the next render. Best-effort and per-project-root, so
# we also print a note for daemons in other roots.
refresh_browse_daemon_for_fonts() {
  [ "$EMOJI_FONT_INSTALLED" -eq 1 ] || return 0
  if [ -x "$BROWSE_BIN" ]; then
    "$BROWSE_BIN" stop >/dev/null 2>&1 || true
  fi
  echo "  Installed a color-emoji font. The next make-pdf render will show emoji."
  echo "  If a gstack browser is running in another project, restart it to pick up the font."
}

prepare_bun_for_windows_compile() {
  BUN_CMD="bun"
  BUN_CMD_WAS_COPIED=0
  [ "$IS_WINDOWS" -eq 1 ] || return 0

  local bun_path
  bun_path="$(command -v bun 2>/dev/null || true)"
  case "$bun_path" in
    *[![:ascii:]]*)
      local bun_copy_dir="$SOURCE_GSTACK_DIR/.tmp-bun-bin"
      mkdir -p "$bun_copy_dir"
      cp -f "$bun_path" "$bun_copy_dir/bun.exe"
      BUN_CMD="$bun_copy_dir/bun.exe"
      BUN_CMD_WAS_COPIED=1
      ;;
  esac
}

bun_cmd() {
  "$BUN_CMD" "$@"
}

cleanup_copied_bun() {
  if [ "${BUN_CMD_WAS_COPIED:-0}" -eq 1 ]; then
    rm -rf "$SOURCE_GSTACK_DIR/.tmp-bun-bin"
  fi
}

prepare_bun_for_windows_compile
trap cleanup_copied_bun EXIT

# 1. Build browse binary if needed (smart rebuild: stale sources, package.json, lock)
NEEDS_BUILD=0
if [ ! -x "$BROWSE_BIN" ]; then
  NEEDS_BUILD=1
elif [ -n "$(find "$SOURCE_GSTACK_DIR/browse/src" -type f -newer "$BROWSE_BIN" -print -quit 2>/dev/null)" ]; then
  NEEDS_BUILD=1
elif [ "$SOURCE_GSTACK_DIR/package.json" -nt "$BROWSE_BIN" ]; then
  NEEDS_BUILD=1
elif [ -f "$SOURCE_GSTACK_DIR/bun.lock" ] && [ "$SOURCE_GSTACK_DIR/bun.lock" -nt "$BROWSE_BIN" ]; then
  NEEDS_BUILD=1
fi

if [ "$NEEDS_BUILD" -eq 1 ]; then
  log "Building browse binary..."
  (
    cd "$SOURCE_GSTACK_DIR"
    bun_cmd install --frozen-lockfile 2>/dev/null || bun_cmd install
    bun_cmd run build
  )
  # Safety net: write .version if build script didn't (e.g., git not available during build)
  if [ ! -f "$SOURCE_GSTACK_DIR/browse/dist/.version" ]; then
    git -C "$SOURCE_GSTACK_DIR" rev-parse HEAD > "$SOURCE_GSTACK_DIR/browse/dist/.version" 2>/dev/null || true
  fi

  # macOS Apple Silicon: ad-hoc codesign compiled binaries.
  # Bun's --compile can produce a corrupt or linker-only code signature that
  # macOS kills with SIGKILL (exit 137). The two-step remove+re-sign is
  # required because a naive `codesign -s - -f` fails when the existing
  # signature block is corrupt. This is idempotent and costs <1s.
  #
  # Some binaries (observed: find-browse, gstack-global-discover) also carry
  # trailing zero-padding AFTER the Mach-O LC_CODE_SIGNATURE region. macOS
  # codesign requires the signature to be the last content and extend to EOF,
  # so the padding triggers "main executable failed strict validation" on
  # re-sign (and "internal error in Code Signing subsystem" on remove). We
  # truncate that trailing slack to the end of LC_CODE_SIGNATURE first, which
  # lets the identical re-sign succeed. The binary runs either way: Bun's
  # adhoc code-page signature satisfies the kernel's exec check even when
  # `codesign --verify` is unhappy, so a re-sign failure only warns when the
  # binary is genuinely SIGKILL'd on exec (exit 137).
  # See: https://github.com/garrytan/gstack/issues/997
  if [ "$(uname -s)" = "Darwin" ] && [ "$(uname -m)" = "arm64" ]; then
    for _bin in browse/dist/browse browse/dist/find-browse design/dist/design make-pdf/dist/pdf bin/gstack-global-discover; do
      _bin_path="$SOURCE_GSTACK_DIR/$_bin"
      [ -f "$_bin_path" ] && [ -x "$_bin_path" ] || continue
      # Strip any trailing bytes past LC_CODE_SIGNATURE so codesign can re-sign.
      # otool prints the signature's dataoff+datasize; if the file is larger,
      # the extra bytes are Bun padding that breaks strict validation.
      _sig_end=$(otool -l "$_bin_path" 2>/dev/null | awk '/LC_CODE_SIGNATURE/{f=1} f&&/dataoff/{o=$2} f&&/datasize/{print o+$2; exit}')
      _fsize=$(stat -f%z "$_bin_path" 2>/dev/null)
      if [ -n "$_sig_end" ] && [ -n "$_fsize" ] && [ "$_sig_end" -gt 0 ] 2>/dev/null && [ "$_sig_end" -lt "$_fsize" ] 2>/dev/null; then
        _trunc_tmp=$(mktemp 2>/dev/null) || _trunc_tmp=""
        if [ -n "$_trunc_tmp" ] && head -c "$_sig_end" "$_bin_path" > "$_trunc_tmp" 2>/dev/null; then
          cat "$_trunc_tmp" > "$_bin_path" && chmod +x "$_bin_path"
        fi
        [ -n "$_trunc_tmp" ] && rm -f "$_trunc_tmp"
      fi
      codesign --remove-signature "$_bin_path" 2>/dev/null || true
      if ! codesign -s - -f "$_bin_path" 2>/dev/null; then
        # Re-sign failed. Only warn if the binary genuinely cannot execute
        # (SIGKILL = exit 137). Otherwise Bun's adhoc code-page signature still
        # runs fine and the codesign --verify miss is cosmetic. set -e safe.
        _probe_rc=0
        "$_bin_path" --help >/dev/null 2>&1 || _probe_rc=$?
        if [ "$_probe_rc" -eq 137 ]; then
          log "warning: codesign failed for $_bin and it is SIGKILL'd on exec (exit 137) — it may not run on Apple Silicon"
        else
          log "note: codesign could not re-sign $_bin, but it executes fine (Bun adhoc signature); continuing"
        fi
      fi
    done
  fi

  # macOS: install coreutils for `gtimeout` (Codex hang protection in /codex + /autoplan).
  # macOS ships BSD `timeout`-less; Homebrew's coreutils installs GNU timeout as
  # `gtimeout` to avoid shadowing BSD utilities. The /codex and /autoplan skills
  # fall back to unwrapped codex invocations when neither is available — this
  # auto-install upgrades them to hang-protected where possible.
  # Skip entirely with GSTACK_SKIP_COREUTILS=1 (CI, managed machines, offline envs).
  if [ "$(uname -s)" = "Darwin" ] && [ "${GSTACK_SKIP_COREUTILS:-0}" != "1" ]; then
    if ! command -v gtimeout >/dev/null 2>&1 && ! command -v timeout >/dev/null 2>&1; then
      if command -v brew >/dev/null 2>&1; then
        log "Installing coreutils for Codex hang protection (set GSTACK_SKIP_COREUTILS=1 to skip)..."
        brew install coreutils >/dev/null 2>&1 || log "warning: brew install coreutils failed; /codex will run without hang protection"
      else
        log "warning: Homebrew not found. /codex will run without hang protection. Install coreutils manually or set GSTACK_SKIP_COREUTILS=1."
      fi
    fi
  fi
fi

if [ ! -x "$BROWSE_BIN" ]; then
  echo "gstack setup failed: browse binary missing at $BROWSE_BIN" >&2
  exit 1
fi

# 1b. Generate .agents/ Codex skill docs — always regenerate to prevent stale descriptions.
# .agents/ is no longer committed — generated at setup time from .tmpl templates.
# bun run build already does this, but we need it when NEEDS_BUILD=0 (binary is fresh).
# Always regenerate: generation is fast (<2s) and mtime-based staleness checks are fragile
# (miss stale files when timestamps match after clone/checkout/upgrade).
AGENTS_DIR="$SOURCE_GSTACK_DIR/.agents/skills"
NEEDS_AGENTS_GEN=1

if [ "$NEEDS_AGENTS_GEN" -eq 1 ] && [ "$NEEDS_BUILD" -eq 0 ]; then
  log "Generating .agents/ skill docs..."
  (
    cd "$SOURCE_GSTACK_DIR"
    bun_cmd install --frozen-lockfile 2>/dev/null || bun_cmd install
    bun_cmd run gen:skill-docs --host codex
  )
fi

# 1c. Generate .factory/ Factory Droid skill docs
if [ "$INSTALL_FACTORY" -eq 1 ] && [ "$NEEDS_BUILD" -eq 0 ]; then
  log "Generating .factory/ skill docs..."
  (
    cd "$SOURCE_GSTACK_DIR"
    bun_cmd install --frozen-lockfile 2>/dev/null || bun_cmd install
    bun_cmd run gen:skill-docs --host factory
  )
fi

# 1d. Generate .opencode/ OpenCode skill docs
if [ "$INSTALL_OPENCODE" -eq 1 ] && [ "$NEEDS_BUILD" -eq 0 ]; then
  log "Generating .opencode/ skill docs..."
  (
    cd "$SOURCE_GSTACK_DIR"
    bun_cmd install --frozen-lockfile 2>/dev/null || bun_cmd install
    bun_cmd run gen:skill-docs --host opencode
  )
fi

# 1e. Generate .cursor/ Cursor skill docs
if [ "$INSTALL_CURSOR" -eq 1 ] && [ "$NEEDS_BUILD" -eq 0 ]; then
  log "Generating .cursor/ skill docs..."
  (
    cd "$SOURCE_GSTACK_DIR"
    bun_cmd install --frozen-lockfile 2>/dev/null || bun_cmd install
    bun_cmd run gen:skill-docs --host cursor
  )
fi

# 2. Ensure Playwright's Chromium is available
# Detect Ubuntu 26.04: Playwright does not yet ship a native chromium build for
# ubuntu26.04-x64. Override the platform to ubuntu24.04-x64 so the installer
# picks the correct binary. This is safe because the ubuntu24.04 build runs
# fine on ubuntu26.04 (same glibc lineage). See #2101.
_PLAYWRIGHT_PLATFORM_OVERRIDE=""
if [ -f /etc/os-release ]; then
  _os_id=$(grep '^ID=' /etc/os-release | cut -d= -f2 | tr -d '"')
  _os_ver=$(grep '^VERSION_ID=' /etc/os-release | cut -d= -f2 | tr -d '"')
  if [ "$_os_id" = "ubuntu" ] && [ "$_os_ver" = "26.04" ]; then
    _PLAYWRIGHT_PLATFORM_OVERRIDE="ubuntu24.04-x64"
    echo "Ubuntu 26.04 detected — using PLAYWRIGHT_HOST_PLATFORM_OVERRIDE=$_PLAYWRIGHT_PLATFORM_OVERRIDE"
  fi
fi

if ! ensure_playwright_browser; then
  echo "Installing Playwright Chromium..."
  # XProtect self-heal (#2554): the probe failure may be the OS killing the
  # cached Chromium, not a missing install. Clear quarantine on the Playwright
  # cache bundles before reinstalling so the fresh fetch launches clean.
  _clear_playwright_quarantine
  _PW_LOCK="${TMPDIR:-/tmp}/gstack-playwright-install.lock"
  # Stale-lock self-heal: a SIGKILL'd prior setup leaves the lock dir behind
  # forever (mkdir mutexes have no owner). If the recorded holder PID is dead,
  # reclaim instead of telling the user to rmdir by hand.
  if [ -d "$_PW_LOCK" ] && [ -f "$_PW_LOCK/pid" ]; then
    _PW_HOLDER=$(cat "$_PW_LOCK/pid" 2>/dev/null || true)
    if [ -n "$_PW_HOLDER" ] && ! kill -0 "$_PW_HOLDER" 2>/dev/null; then
      echo "  reclaiming stale Chromium-install lock (holder pid $_PW_HOLDER is gone)" >&2
      rm -rf "$_PW_LOCK" 2>/dev/null || true
    fi
  fi
  if mkdir "$_PW_LOCK" 2>/dev/null; then
    echo "$$" > "$_PW_LOCK/pid" 2>/dev/null || true
    # Chain the earlier cleanup_copied_bun EXIT trap: `trap ... EXIT` REPLACES
    # the previous handler, so the lock trap must run both or any run taking
    # this path leaves .tmp-bun-bin behind.
    trap 'rm -rf "$_PW_LOCK" 2>/dev/null || true; cleanup_copied_bun' EXIT
    (
      cd "$SOURCE_GSTACK_DIR"
      if [ -n "$_PLAYWRIGHT_PLATFORM_OVERRIDE" ]; then
        PLAYWRIGHT_HOST_PLATFORM_OVERRIDE="$_PLAYWRIGHT_PLATFORM_OVERRIDE" bunx playwright install chromium
      else
        bunx playwright install chromium
      fi
    )
    rm -rf "$_PW_LOCK" 2>/dev/null || true
    # Restore the original handler (never `trap - EXIT`, which would clear
    # cleanup_copied_bun for the rest of the script).
    trap cleanup_copied_bun EXIT
  else
    echo "  another gstack setup is already installing Chromium (lock: $_PW_LOCK)." >&2
    echo "  Wait for it to finish, then re-run ./setup. If no other setup is running," >&2
    echo "  remove the stale lock: rm -rf \"$_PW_LOCK\"" >&2
    exit 1
  fi

  if [ "$IS_WINDOWS" -eq 1 ]; then
    # On Windows, Node.js launches Chromium (not Bun — see oven-sh/bun#4253).
    # Ensure playwright is importable by Node from the gstack directory.
    if ! command -v node >/dev/null 2>&1; then
      echo "gstack setup failed: Node.js is required on Windows (Bun cannot launch Chromium due to a pipe bug)" >&2
      echo "  Install Node.js: https://nodejs.org/" >&2
      exit 1
    fi
    echo "Windows detected — verifying Node.js can load Playwright..."
    (
      cd "$SOURCE_GSTACK_DIR"
      # Bun's node_modules already has playwright; verify Node can require it
      node -e "require('playwright')" 2>/dev/null || npm install --no-save playwright
      # @ngrok/ngrok is externalized in server-node.mjs and resolved at runtime.
      # Verify the platform-specific native binary is installed so /pair-agent
      # tunnels don't fail later with a cryptic module-not-found error.
      node -e "require('@ngrok/ngrok')" 2>/dev/null || npm install --no-save @ngrok/ngrok
    )
  fi
fi

if ! ensure_playwright_browser; then
  if [ "$IS_WINDOWS" -eq 1 ]; then
    echo "gstack setup failed: Playwright Chromium could not be launched via Node.js" >&2
    echo "  This is a known issue with Bun on Windows (oven-sh/bun#4253)." >&2
    echo "  Ensure Node.js is installed and 'node -e \"require('playwright')\"' works." >&2
  else
    echo "gstack setup failed: Playwright Chromium could not be launched" >&2
  fi
  exit 1
fi

# 2b. Ensure a color-emoji font is installed so make-pdf emoji render (Linux).
#     Best-effort: warn instead of failing if it can't install.
if ! ensure_emoji_font; then
  echo "  Note: could not auto-install a color-emoji font. Emoji in make-pdf" >&2
  echo "  output may render as boxes (▯). Install one manually, e.g.:" >&2
  echo "    Debian/Ubuntu: sudo apt-get install fonts-noto-color-emoji" >&2
  echo "    Fedora:        sudo dnf install google-noto-color-emoji-fonts" >&2
  echo "    Arch:          sudo pacman -S noto-fonts-emoji" >&2
  echo "    Alpine:        sudo apk add font-noto-emoji" >&2
else
  refresh_browse_daemon_for_fonts
fi

# 3. Ensure ~/.gstack global state directory exists
mkdir -p "$HOME/.gstack/projects"

# ─── Helper: link a skill's runtime assets into its installed dir ────────────
# Installs EVERY runtime asset a skill ships next to its SKILL.md (#2317,
# #2454): review/checklist.md + specialists/, qa/templates + references,
# gstack-upgrade/migrations, careful/bin, freeze/bin, sections/, etc.
# Exclusion list rather than inclusion list (F7) so a new asset file is
# installed by default instead of silently dropped:
#   - SKILL.md       linked separately by the caller (name-aware)
#   - node_modules   dependency trees, never a runtime read
#   - dist           compiled binaries; skills reference them repo-anchored
#                    (~/.claude/skills/gstack/browse/dist/...), never
#                    alias-relative, and fresh clones haven't built them
#   - test           test fixtures
#   - *.tmpl         generator sources; the generated file is the asset
#   - hidden files   excluded by the glob (no dotglob)
# Shared so any flattened-skill installer can reuse it (the Claude path is
# the first consumer; codex/factory/opencode install from generated trees).
_link_skill_runtime_assets() {
  local src_dir="$1"
  local dst_dir="$2"
  local asset asset_name
  for asset in "$src_dir"/*; do
    [ -e "$asset" ] || continue  # empty-glob guard
    asset_name="$(basename "$asset")"
    case "$asset_name" in
      SKILL.md|node_modules|dist|test|*.tmpl) continue ;;
    esac
    # Refresh unconditionally: rm the old entry (symlink OR real copy — the
    # Windows install pattern) so re-runs after `git pull` pick up changes.
    if [ -e "$dst_dir/$asset_name" ] || [ -L "$dst_dir/$asset_name" ]; then
      rm -rf "$dst_dir/$asset_name"
    fi
    _link_or_copy "$asset" "$dst_dir/$asset_name"
    # P5: the exclusion list above filters DIRECT children only, but the
    # Windows cp -R copy sweeps NESTED gitignored build output too (concrete:
    # ios-qa/scripts/gen-accessors-tool/.build is 252MB). Prune post-copy —
    # a rendered skill install is never a build root, so nested
    # node_modules/.build/dist are dead weight. ONLY here: the generic
    # _link_or_copy stays untouched because runtime roots (browse/, design/)
    # intentionally copy their dist/ binaries.
    if [ "$IS_WINDOWS" -eq 1 ] && [ -d "$dst_dir/$asset_name" ] && [ ! -L "$dst_dir/$asset_name" ]; then
      find "$dst_dir/$asset_name" -type d \( -name node_modules -o -name .build -o -name dist \) -prune -exec rm -rf {} + 2>/dev/null || true
    fi
  done
}

# ─── Helper: link Claude skill subdirectories into a skills parent directory ──
# Creates real directories (not symlinks) at the top level with a SKILL.md symlink
# inside. This ensures Claude discovers them as top-level skills, not nested under
# gstack/ (which would auto-prefix them as gstack-*).
# When SKILL_PREFIX=1, directories are prefixed with "gstack-".
# Use --no-prefix to restore flat names.
link_claude_skill_dirs() {
  local gstack_dir="$1"
  local skills_dir="$2"
  local linked=()
  for skill_dir in "$gstack_dir"/*/; do
    if [ -f "$skill_dir/SKILL.md" ]; then
      dir_name="$(basename "$skill_dir")"
      # Skip node_modules
      [ "$dir_name" = "node_modules" ] && continue
      # Use frontmatter name: if present (e.g., run-tests/ with name: test → symlink as "test")
      skill_name=$(grep -m1 '^name:' "$skill_dir/SKILL.md" 2>/dev/null | sed 's/^name:[[:space:]]*//' | tr -d '[:space:]')
      [ -z "$skill_name" ] && skill_name="$dir_name"
      # Apply gstack- prefix unless --no-prefix or already prefixed
      if [ "$SKILL_PREFIX" -eq 1 ]; then
        case "$skill_name" in
          gstack-*) link_name="$skill_name" ;;
          *)        link_name="gstack-$skill_name" ;;
        esac
      else
        link_name="$skill_name"
      fi
      target="$skills_dir/$link_name"
      # Upgrade old directory symlinks to real directories
      if [ -L "$target" ]; then
        rm -f "$target"
      fi
      # Create real directory with symlinked SKILL.md (absolute path)
      # Use mkdir -p unconditionally (idempotent) to avoid TOCTOU race
      mkdir -p "$target"
      # Validate target isn't a symlink before creating the link
      if [ -L "$target/SKILL.md" ]; then rm "$target/SKILL.md"; fi
      # #2569: prefer a rendered :user variant when present. gbrain installs
      # render brain-aware SKILL.md into ${GSTACK_HOME}/render/claude via
      # gen:skill-docs --out-dir instead of dirtying the tracked source
      # checkout; when a render exists for this skill, serve it. The rendered
      # file's section-base paths point into the render dir, so section reads
      # resolve there too.
      _skill_md_src="$gstack_dir/$dir_name/SKILL.md"
      _render_dir="${GSTACK_USER_RENDER_DIR:-${GSTACK_HOME:-$HOME/.gstack}/render/claude}"
      if [ -f "$_render_dir/$dir_name/SKILL.md" ]; then
        _skill_md_src="$_render_dir/$dir_name/SKILL.md"
      fi
      _link_or_copy "$_skill_md_src" "$target/SKILL.md"
      # Link every runtime asset the skill ships next to its SKILL.md (#2317,
      # #2454): sections/ for carved skills, review's checklist.md +
      # specialists/, qa's templates/ + references/, gstack-upgrade's
      # migrations/, careful/freeze's bin/, ... Without this, only SKILL.md
      # landed and /review 404'd at "Read .claude/skills/review/checklist.md"
      # on every fresh Claude install. Routes through _link_or_copy so Windows
      # gets real copies refreshed on every ./setup.
      _link_skill_runtime_assets "$gstack_dir/$dir_name" "$target"
      linked+=("$link_name")
    fi
  done
  if [ ${#linked[@]} -gt 0 ]; then
    echo "  linked skills: ${linked[*]}"
    _print_windows_copy_note_once
  fi
}

# ─── Helper: install an alias SKILL.md as a rewritten COPY ───────────────────
# Alias dirs (_gstack-command, connect-chrome) must NOT symlink the canonical
# SKILL.md: the alias then carries the canonical frontmatter name:, Claude Code
# sees two skills with the same name, and drops the ENTIRE personal-skills set
# (#2511, #2201). Copy-then-rewrite instead: sed reads the SOURCE and writes a
# fresh copy with name: set to the alias. It must never edit through an
# existing symlink — that would rewrite the generated source file itself.
# NOTE: every alias name passed to this helper (_gstack-command,
# connect-chrome, gstack-connect-chrome) is hardcoded in the _INVENTORY seed
# list in bin/gstack-uninstall — keep the two sites in sync when adding or
# renaming an alias, or uninstall will refuse to delete the new alias dir.
_install_alias_skill_md() {
  local src_skill_md="$1"
  local dst_dir="$2"
  local alias_name="$3"
  [ -f "$src_skill_md" ] || return 0
  # Old installs left the alias as a whole-dir symlink — replace it.
  if [ -L "$dst_dir" ]; then rm -f "$dst_dir"; fi
  mkdir -p "$dst_dir"
  # Remove any prior symlinked SKILL.md so the redirect below cannot write
  # through it into the generated source.
  rm -f "$dst_dir/SKILL.md"
  sed "1,/^---\$/ s/^name:[[:space:]].*/name: $alias_name/" "$src_skill_md" > "$dst_dir/SKILL.md"
}

# Claude Code skips the repo-shaped ~/.claude/skills/gstack directory when
# building the user-facing slash-command list. Keep the repo path for runtime
# assets, and add a separate thin wrapper. Its frontmatter name is rewritten to
# `_gstack-command` (the dir name) so it never collides with the canonical
# `gstack` name (#2511).
link_claude_root_skill_alias() {
  local gstack_dir="$1"
  local skills_dir="$2"
  local target="$skills_dir/_gstack-command"

  [ -f "$gstack_dir/SKILL.md" ] || return 0
  _install_alias_skill_md "$gstack_dir/SKILL.md" "$target" "_gstack-command"
  echo "  linked root skill alias: gstack"
}

# ─── Helper: remove old unprefixed Claude skill entries ───────────────────────
# Migration: when switching from flat names to gstack- prefixed names,
# clean up stale symlinks or directories that point into the gstack directory.
cleanup_old_claude_symlinks() {
  local gstack_dir="$1"
  local skills_dir="$2"
  local removed=()
  for skill_dir in "$gstack_dir"/*/; do
    if [ -f "$skill_dir/SKILL.md" ]; then
      skill_name="$(basename "$skill_dir")"
      [ "$skill_name" = "node_modules" ] && continue
      # Skip already-prefixed dirs (gstack-upgrade) — no old symlink to clean
      case "$skill_name" in gstack-*) continue ;; esac
      old_target="$skills_dir/$skill_name"
      # Remove directory symlinks pointing into gstack/
      if [ -L "$old_target" ]; then
        link_dest="$(readlink "$old_target" 2>/dev/null || true)"
        case "$link_dest" in
          gstack/*|*/gstack/*)
            rm -f "$old_target"
            removed+=("$skill_name")
            ;;
        esac
      # Remove real directories with symlinked SKILL.md pointing into gstack/
      elif [ -d "$old_target" ] && [ -L "$old_target/SKILL.md" ]; then
        link_dest="$(readlink "$old_target/SKILL.md" 2>/dev/null || true)"
        case "$link_dest" in
          *gstack*)
            rm -rf "$old_target"
            removed+=("$skill_name")
            ;;
        esac
      # Windows install pattern: real dir with real-file SKILL.md (no symlink
      # available, so we can't readlink to verify provenance). The outer loop
      # iterates known gstack skill names from "$gstack_dir"/*, so a name match
      # plus IS_WINDOWS is safe to treat as gstack-managed during a mode flip.
      elif [ "$IS_WINDOWS" -eq 1 ] && [ -d "$old_target" ] && [ -f "$old_target/SKILL.md" ]; then
        rm -rf "$old_target"
        removed+=("$skill_name")
      fi
    fi
  done
  if [ ${#removed[@]} -gt 0 ]; then
    echo "  cleaned up old entries: ${removed[*]}"
  fi
}

# ─── Helper: remove old prefixed Claude skill entries ─────────────────────────
# Reverse migration: when switching from gstack- prefixed names to flat names,
# clean up stale gstack-* symlinks or directories that point into the gstack directory.
cleanup_prefixed_claude_symlinks() {
  local gstack_dir="$1"
  local skills_dir="$2"
  local removed=()
  for skill_dir in "$gstack_dir"/*/; do
    if [ -f "$skill_dir/SKILL.md" ]; then
      skill_name="$(basename "$skill_dir")"
      [ "$skill_name" = "node_modules" ] && continue
      # Only clean up prefixed entries for dirs that AREN'T already prefixed
      # (e.g., remove gstack-qa but NOT gstack-upgrade which is the real dir name)
      case "$skill_name" in gstack-*) continue ;; esac
      prefixed_target="$skills_dir/gstack-$skill_name"
      # Remove directory symlinks pointing into gstack/
      if [ -L "$prefixed_target" ]; then
        link_dest="$(readlink "$prefixed_target" 2>/dev/null || true)"
        case "$link_dest" in
          gstack/*|*/gstack/*)
            rm -f "$prefixed_target"
            removed+=("gstack-$skill_name")
            ;;
        esac
      # Remove real directories with symlinked SKILL.md pointing into gstack/
      elif [ -d "$prefixed_target" ] && [ -L "$prefixed_target/SKILL.md" ]; then
        link_dest="$(readlink "$prefixed_target/SKILL.md" 2>/dev/null || true)"
        case "$link_dest" in
          *gstack*)
            rm -rf "$prefixed_target"
            removed+=("gstack-$skill_name")
            ;;
        esac
      # Windows install pattern: real dir with real-file SKILL.md. Same
      # reasoning as cleanup_old_claude_symlinks — directory name match plus
      # IS_WINDOWS is safe during a mode flip.
      elif [ "$IS_WINDOWS" -eq 1 ] && [ -d "$prefixed_target" ] && [ -f "$prefixed_target/SKILL.md" ]; then
        rm -rf "$prefixed_target"
        removed+=("gstack-$skill_name")
      fi
    fi
  done
  if [ ${#removed[@]} -gt 0 ]; then
    echo "  cleaned up prefixed entries: ${removed[*]}"
  fi
}

# ─── Helper: link generated Codex skills into a skills parent directory ──
# Installs from .agents/skills/gstack-* (the generated Codex-format skills)
# instead of source dirs (which have Claude paths).
link_codex_skill_dirs() {
  local gstack_dir="$1"
  local skills_dir="$2"
  local agents_dir="$gstack_dir/.agents/skills"
  local linked=()

  if [ ! -d "$agents_dir" ]; then
    echo "  Generating .agents/ skill docs..."
    ( cd "$gstack_dir" && bun_cmd run gen:skill-docs --host codex )
  fi

  if [ ! -d "$agents_dir" ]; then
    echo "  warning: .agents/skills/ generation failed — run 'bun run gen:skill-docs --host codex' manually" >&2
    return 1
  fi

  for skill_dir in "$agents_dir"/gstack*/; do
    if [ -f "$skill_dir/SKILL.md" ]; then
      skill_name="$(basename "$skill_dir")"
      # Skip the sidecar directory — it contains runtime asset symlinks (bin/,
      # browse/), not a skill. Linking it would overwrite the root gstack
      # symlink that Step 5 already pointed at the repo root.
      [ "$skill_name" = "gstack" ] && continue
      target="$skills_dir/$skill_name"
      # Create or update symlink
      # #2444: on Windows the installed target is a REAL directory copy, so
      # the symlink-or-missing guard skipped every re-run and SKILL.md never
      # refreshed after `git pull`. IS_WINDOWS bypasses the guard —
      # _link_or_copy rm -rf's the destination first, refreshing the copy.
      # #2142: a real dir may only be replaced when it is provably ours
      # (_owned_for_windows_refresh), never a user's own colliding dir.
      if [ "$IS_WINDOWS" -eq 1 ] || [ -L "$target" ] || [ ! -e "$target" ]; then
        if _owned_for_windows_refresh "$target"; then
          _link_or_copy "$skill_dir" "$target"
          linked+=("$skill_name")
        else
          echo "  left in place (existing dir not gstack-managed — no generated banner): $target" >&2
        fi
      fi
    fi
  done
  if [ ${#linked[@]} -gt 0 ]; then
    echo "  linked skills: ${linked[*]}"
  fi
}

# ─── Helper: create .agents/skills/gstack/ sidecar symlinks ──────────
# Codex/Gemini/Cursor read skills from .agents/skills/. We link runtime
# assets (bin/, browse/dist/, review/, qa/, etc.) so skill templates can
# resolve paths like $SKILL_ROOT/review/design-checklist.md.
create_agents_sidecar() {
  local repo_root="$1"
  local agents_gstack="$repo_root/.agents/skills/gstack"
  # #2142: a hand-written skill squatting on the canonical name is the
  # user's — never write into it (the Windows branch would rm -rf its
  # subdirs on every re-run).
  if _sidecar_root_user_owned "$agents_gstack"; then
    echo "  left in place (existing dir not gstack-managed — no generated banner): $agents_gstack" >&2
    return 0
  fi
  mkdir -p "$agents_gstack"

  # Sidecar directories that skills reference at runtime. bin scripts import
  # shared modules via ../lib, so bin and lib must always travel together.
  for asset in bin lib browse review qa; do
    local src="$SOURCE_GSTACK_DIR/$asset"
    local dst="$agents_gstack/$asset"
    if [ -d "$src" ] || [ -f "$src" ]; then
      # #2444: IS_WINDOWS bypass — real-dir copies never match -L, so re-runs
      # skipped the refresh. _link_or_copy rm -rf's the destination first.
      if [ "$IS_WINDOWS" -eq 1 ] || [ -L "$dst" ] || [ ! -e "$dst" ]; then
        _link_or_copy "$src" "$dst"
      fi
    fi
  done

  # Sidecar files that skills reference at runtime
  for file in ETHOS.md; do
    local src="$SOURCE_GSTACK_DIR/$file"
    local dst="$agents_gstack/$file"
    if [ -f "$src" ]; then
      # #2444: IS_WINDOWS bypass — real-dir copies never match -L, so re-runs
      # skipped the refresh. _link_or_copy rm -rf's the destination first.
      if [ "$IS_WINDOWS" -eq 1 ] || [ -L "$dst" ] || [ ! -e "$dst" ]; then
        _link_or_copy "$src" "$dst"
      fi
    fi
  done

  # supabase/config.sh — required by gstack-telemetry-sync to resolve GSTACK_SUPABASE_URL
  # (file-level on purpose: migrations/ and functions/ are dev-only)
  if [ -f "$SOURCE_GSTACK_DIR/supabase/config.sh" ]; then
    mkdir -p "$agents_gstack/supabase"
    _link_or_copy "$SOURCE_GSTACK_DIR/supabase/config.sh" "$agents_gstack/supabase/config.sh"
  fi
}

# ─── Helper: create a minimal ~/.codex/skills/gstack runtime root ───────────
# Codex scans ~/.codex/skills recursively. Exposing the whole repo here causes
# duplicate skills because source SKILL.md files and generated Codex skills are
# both discoverable. Keep this directory limited to runtime assets + root skill.
create_codex_runtime_root() {
  local gstack_dir="$1"
  local codex_gstack="$2"
  local agents_dir="$gstack_dir/.agents/skills"

  if [ -L "$codex_gstack" ]; then
    rm -f "$codex_gstack"
  elif [ -d "$codex_gstack" ] && [ "$codex_gstack" != "$gstack_dir" ]; then
    # Old direct installs left a real directory here with stale source skills.
    # Remove it so we start fresh with only the minimal runtime assets.
    rm -rf "$codex_gstack"
  fi

  mkdir -p "$codex_gstack" "$codex_gstack/browse" "$codex_gstack/gstack-upgrade" "$codex_gstack/review"

  if [ -f "$agents_dir/gstack/SKILL.md" ]; then
    _link_or_copy "$agents_dir/gstack/SKILL.md" "$codex_gstack/SKILL.md"
  fi
  if [ -d "$gstack_dir/bin" ]; then
    _link_or_copy "$gstack_dir/bin" "$codex_gstack/bin"
  fi
  if [ -d "$gstack_dir/lib" ]; then
    _link_or_copy "$gstack_dir/lib" "$codex_gstack/lib"
  fi
  if [ -d "$gstack_dir/browse/dist" ]; then
    _link_or_copy "$gstack_dir/browse/dist" "$codex_gstack/browse/dist"
  fi
  if [ -d "$gstack_dir/browse/bin" ]; then
    _link_or_copy "$gstack_dir/browse/bin" "$codex_gstack/browse/bin"
  fi
  if [ -f "$agents_dir/gstack-upgrade/SKILL.md" ]; then
    _link_or_copy "$agents_dir/gstack-upgrade/SKILL.md" "$codex_gstack/gstack-upgrade/SKILL.md"
  fi
  # plan-eng-review's inline office-hours step reads
  # $GSTACK_ROOT/office-hours/SKILL.md (#2449) — install the codex-rendered
  # variant there so the documented path exists.
  if [ -f "${agents_dir}/gstack-office-hours/SKILL.md" ]; then
    mkdir -p "${codex_gstack}/office-hours"
    _link_or_copy "${agents_dir}/gstack-office-hours/SKILL.md" "${codex_gstack}/office-hours/SKILL.md"
  fi
  # Review runtime assets (individual files, NOT the whole review/ dir which has SKILL.md)
  for f in checklist.md design-checklist.md greptile-triage.md TODOS-format.md; do
    if [ -f "$gstack_dir/review/$f" ]; then
      _link_or_copy "$gstack_dir/review/$f" "$codex_gstack/review/$f"
    fi
  done
  # ETHOS.md — referenced by "Search Before Building" in all skill preambles
  if [ -f "$gstack_dir/ETHOS.md" ]; then
    _link_or_copy "$gstack_dir/ETHOS.md" "$codex_gstack/ETHOS.md"
  fi
  # supabase/config.sh — required by gstack-telemetry-sync to resolve GSTACK_SUPABASE_URL
  if [ -f "$gstack_dir/supabase/config.sh" ]; then
    mkdir -p "$codex_gstack/supabase"
    _link_or_copy "$gstack_dir/supabase/config.sh" "$codex_gstack/supabase/config.sh"
  fi
}

create_factory_runtime_root() {
  local gstack_dir="$1"
  local factory_gstack="$2"
  local factory_dir="$gstack_dir/.factory/skills"

  if [ -L "$factory_gstack" ]; then
    rm -f "$factory_gstack"
  elif [ -d "$factory_gstack" ] && [ "$factory_gstack" != "$gstack_dir" ]; then
    rm -rf "$factory_gstack"
  fi

  mkdir -p "$factory_gstack" "$factory_gstack/browse" "$factory_gstack/gstack-upgrade" "$factory_gstack/review"

  if [ -f "$factory_dir/gstack/SKILL.md" ]; then
    _link_or_copy "$factory_dir/gstack/SKILL.md" "$factory_gstack/SKILL.md"
  fi
  if [ -d "$gstack_dir/bin" ]; then
    _link_or_copy "$gstack_dir/bin" "$factory_gstack/bin"
  fi
  if [ -d "$gstack_dir/lib" ]; then
    _link_or_copy "$gstack_dir/lib" "$factory_gstack/lib"
  fi
  if [ -d "$gstack_dir/browse/dist" ]; then
    _link_or_copy "$gstack_dir/browse/dist" "$factory_gstack/browse/dist"
  fi
  if [ -d "$gstack_dir/browse/bin" ]; then
    _link_or_copy "$gstack_dir/browse/bin" "$factory_gstack/browse/bin"
  fi
  if [ -f "$factory_dir/gstack-upgrade/SKILL.md" ]; then
    _link_or_copy "$factory_dir/gstack-upgrade/SKILL.md" "$factory_gstack/gstack-upgrade/SKILL.md"
  fi
  # plan-eng-review's inline office-hours step reads
  # $GSTACK_ROOT/office-hours/SKILL.md (#2449) — install the factory-rendered
  # variant there so the documented path exists.
  if [ -f "${factory_dir}/gstack-office-hours/SKILL.md" ]; then
    mkdir -p "${factory_gstack}/office-hours"
    _link_or_copy "${factory_dir}/gstack-office-hours/SKILL.md" "${factory_gstack}/office-hours/SKILL.md"
  fi
  for f in checklist.md design-checklist.md greptile-triage.md TODOS-format.md; do
    if [ -f "$gstack_dir/review/$f" ]; then
      _link_or_copy "$gstack_dir/review/$f" "$factory_gstack/review/$f"
    fi
  done
  if [ -f "$gstack_dir/ETHOS.md" ]; then
    _link_or_copy "$gstack_dir/ETHOS.md" "$factory_gstack/ETHOS.md"
  fi
  # supabase/config.sh — required by gstack-telemetry-sync to resolve GSTACK_SUPABASE_URL
  if [ -f "$gstack_dir/supabase/config.sh" ]; then
    mkdir -p "$factory_gstack/supabase"
    _link_or_copy "$gstack_dir/supabase/config.sh" "$factory_gstack/supabase/config.sh"
  fi
}

create_opencode_runtime_root() {
  local gstack_dir="$1"
  local opencode_gstack="$2"
  local opencode_dir="$gstack_dir/.opencode/skills"

  if [ -L "$opencode_gstack" ]; then
    rm -f "$opencode_gstack"
  elif [ -d "$opencode_gstack" ] && [ "$opencode_gstack" != "$gstack_dir" ]; then
    rm -rf "$opencode_gstack"
  fi

  mkdir -p "$opencode_gstack" "$opencode_gstack/browse" "$opencode_gstack/design" "$opencode_gstack/gstack-upgrade" "$opencode_gstack/review" "$opencode_gstack/qa" "$opencode_gstack/plan-devex-review"

  if [ -f "$opencode_dir/gstack/SKILL.md" ]; then
    _link_or_copy "$opencode_dir/gstack/SKILL.md" "$opencode_gstack/SKILL.md"
  fi
  if [ -d "$gstack_dir/bin" ]; then
    _link_or_copy "$gstack_dir/bin" "$opencode_gstack/bin"
  fi
  if [ -d "$gstack_dir/lib" ]; then
    _link_or_copy "$gstack_dir/lib" "$opencode_gstack/lib"
  fi
  if [ -d "$gstack_dir/browse/dist" ]; then
    _link_or_copy "$gstack_dir/browse/dist" "$opencode_gstack/browse/dist"
  fi
  if [ -d "$gstack_dir/browse/bin" ]; then
    _link_or_copy "$gstack_dir/browse/bin" "$opencode_gstack/browse/bin"
  fi
  if [ -d "$gstack_dir/design/dist" ]; then
    _link_or_copy "$gstack_dir/design/dist" "$opencode_gstack/design/dist"
  fi
  if [ -f "$opencode_dir/gstack-upgrade/SKILL.md" ]; then
    _link_or_copy "$opencode_dir/gstack-upgrade/SKILL.md" "$opencode_gstack/gstack-upgrade/SKILL.md"
  fi
  # plan-eng-review's inline office-hours step reads
  # $GSTACK_ROOT/office-hours/SKILL.md (#2449) — install the opencode-rendered
  # variant there so the documented path exists.
  if [ -f "${opencode_dir}/gstack-office-hours/SKILL.md" ]; then
    mkdir -p "${opencode_gstack}/office-hours"
    _link_or_copy "${opencode_dir}/gstack-office-hours/SKILL.md" "${opencode_gstack}/office-hours/SKILL.md"
  fi
  for f in checklist.md design-checklist.md greptile-triage.md TODOS-format.md; do
    if [ -f "$gstack_dir/review/$f" ]; then
      _link_or_copy "$gstack_dir/review/$f" "$opencode_gstack/review/$f"
    fi
  done
  if [ -d "$gstack_dir/review/specialists" ]; then
    _link_or_copy "$gstack_dir/review/specialists" "$opencode_gstack/review/specialists"
  fi
  if [ -d "$gstack_dir/qa/templates" ]; then
    _link_or_copy "$gstack_dir/qa/templates" "$opencode_gstack/qa/templates"
  fi
  if [ -d "$gstack_dir/qa/references" ]; then
    _link_or_copy "$gstack_dir/qa/references" "$opencode_gstack/qa/references"
  fi
  if [ -f "$gstack_dir/plan-devex-review/dx-hall-of-fame.md" ]; then
    _link_or_copy "$gstack_dir/plan-devex-review/dx-hall-of-fame.md" "$opencode_gstack/plan-devex-review/dx-hall-of-fame.md"
  fi
  if [ -f "$gstack_dir/ETHOS.md" ]; then
    _link_or_copy "$gstack_dir/ETHOS.md" "$opencode_gstack/ETHOS.md"
  fi
  # supabase/config.sh — required by gstack-telemetry-sync to resolve GSTACK_SUPABASE_URL
  if [ -f "$gstack_dir/supabase/config.sh" ]; then
    mkdir -p "$opencode_gstack/supabase"
    _link_or_copy "$gstack_dir/supabase/config.sh" "$opencode_gstack/supabase/config.sh"
  fi
}

link_factory_skill_dirs() {
  local gstack_dir="$1"
  local skills_dir="$2"
  local factory_dir="$gstack_dir/.factory/skills"
  local linked=()

  if [ ! -d "$factory_dir" ]; then
    echo "  Generating .factory/ skill docs..."
    ( cd "$gstack_dir" && bun_cmd run gen:skill-docs --host factory )
  fi

  if [ ! -d "$factory_dir" ]; then
    echo "  warning: .factory/skills/ generation failed — run 'bun run gen:skill-docs --host factory' manually" >&2
    return 1
  fi

  for skill_dir in "$factory_dir"/gstack*/; do
    if [ -f "$skill_dir/SKILL.md" ]; then
      skill_name="$(basename "$skill_dir")"
      [ "$skill_name" = "gstack" ] && continue
      target="$skills_dir/$skill_name"
      # #2444: on Windows the installed target is a REAL directory copy, so
      # the symlink-or-missing guard skipped every re-run and SKILL.md never
      # refreshed after `git pull`. IS_WINDOWS bypasses the guard —
      # _link_or_copy rm -rf's the destination first, refreshing the copy.
      # #2142: a real dir may only be replaced when it is provably ours
      # (_owned_for_windows_refresh), never a user's own colliding dir.
      if [ "$IS_WINDOWS" -eq 1 ] || [ -L "$target" ] || [ ! -e "$target" ]; then
        if _owned_for_windows_refresh "$target"; then
          _link_or_copy "$skill_dir" "$target"
          linked+=("$skill_name")
        else
          echo "  left in place (existing dir not gstack-managed — no generated banner): $target" >&2
        fi
      fi
    fi
  done
  if [ ${#linked[@]} -gt 0 ]; then
    echo "  linked skills: ${linked[*]}"
  fi
}

link_opencode_skill_dirs() {
  local gstack_dir="$1"
  local skills_dir="$2"
  local opencode_dir="$gstack_dir/.opencode/skills"
  local linked=()

  if [ ! -d "$opencode_dir" ]; then
    echo "  Generating .opencode/ skill docs..."
    ( cd "$gstack_dir" && bun_cmd run gen:skill-docs --host opencode )
  fi

  if [ ! -d "$opencode_dir" ]; then
    echo "  warning: .opencode/skills/ generation failed — run 'bun run gen:skill-docs --host opencode' manually" >&2
    return 1
  fi

  for skill_dir in "$opencode_dir"/gstack*/; do
    if [ -f "$skill_dir/SKILL.md" ]; then
      skill_name="$(basename "$skill_dir")"
      [ "$skill_name" = "gstack" ] && continue
      target="$skills_dir/$skill_name"
      # #2444: on Windows the installed target is a REAL directory copy, so
      # the symlink-or-missing guard skipped every re-run and SKILL.md never
      # refreshed after `git pull`. IS_WINDOWS bypasses the guard —
      # _link_or_copy rm -rf's the destination first, refreshing the copy.
      # #2142: a real dir may only be replaced when it is provably ours
      # (_owned_for_windows_refresh), never a user's own colliding dir.
      if [ "$IS_WINDOWS" -eq 1 ] || [ -L "$target" ] || [ ! -e "$target" ]; then
        if _owned_for_windows_refresh "$target"; then
          _link_or_copy "$skill_dir" "$target"
          linked+=("$skill_name")
        else
          echo "  left in place (existing dir not gstack-managed — no generated banner): $target" >&2
        fi
      fi
    fi
  done
  if [ ${#linked[@]} -gt 0 ]; then
    echo "  linked skills: ${linked[*]}"
  fi
}

# ─── Helper: create a minimal ~/.cursor/skills/gstack runtime root ──────────
# Cursor scans ~/.cursor/skills. Same shape as the Codex/Factory/OpenCode
# runtime roots: root SKILL.md from the generated tree + runtime assets only.
# Contributed by @szsunyuan (PR #2547), re-derived onto the current installers.
create_cursor_runtime_root() {
  local gstack_dir="$1"
  local cursor_gstack="$2"
  local cursor_dir="$gstack_dir/.cursor/skills"
  local generated_root="$cursor_dir/gstack"

  if [ -L "$cursor_gstack" ]; then
    rm -f "$cursor_gstack"
  elif _sidecar_root_user_owned "$cursor_gstack"; then
    # #2142: a hand-written skill squatting on the canonical name is the
    # user's — never wipe it to make room for the runtime root.
    echo "  left in place (existing dir not gstack-managed — no generated banner): $cursor_gstack" >&2
    return 0
  elif [ -d "$cursor_gstack" ] && [ "$cursor_gstack" != "$gstack_dir" ] && [ "$cursor_gstack" != "$generated_root" ]; then
    rm -rf "$cursor_gstack"
  fi

  mkdir -p "$cursor_gstack" "$cursor_gstack/browse" "$cursor_gstack/gstack-upgrade" "$cursor_gstack/review"

  if [ -f "$cursor_dir/gstack/SKILL.md" ]; then
    _link_or_copy "$cursor_dir/gstack/SKILL.md" "$cursor_gstack/SKILL.md"
  fi
  # bin scripts import shared modules via ../lib — bin and lib travel together.
  if [ -d "$gstack_dir/bin" ]; then
    _link_or_copy "$gstack_dir/bin" "$cursor_gstack/bin"
  fi
  if [ -d "$gstack_dir/lib" ]; then
    _link_or_copy "$gstack_dir/lib" "$cursor_gstack/lib"
  fi
  if [ -d "$gstack_dir/browse/dist" ]; then
    _link_or_copy "$gstack_dir/browse/dist" "$cursor_gstack/browse/dist"
  fi
  if [ -d "$gstack_dir/browse/bin" ]; then
    _link_or_copy "$gstack_dir/browse/bin" "$cursor_gstack/browse/bin"
  fi
  if [ -f "$cursor_dir/gstack-upgrade/SKILL.md" ]; then
    _link_or_copy "$cursor_dir/gstack-upgrade/SKILL.md" "$cursor_gstack/gstack-upgrade/SKILL.md"
  fi
  # Review runtime assets — the cursor host config ships the lean pair.
  for f in checklist.md TODOS-format.md; do
    if [ -f "$gstack_dir/review/$f" ]; then
      _link_or_copy "$gstack_dir/review/$f" "$cursor_gstack/review/$f"
    fi
  done
  if [ -f "$gstack_dir/ETHOS.md" ]; then
    _link_or_copy "$gstack_dir/ETHOS.md" "$cursor_gstack/ETHOS.md"
  fi
  # supabase/config.sh — required by gstack-telemetry-sync to resolve GSTACK_SUPABASE_URL
  if [ -f "$gstack_dir/supabase/config.sh" ]; then
    mkdir -p "$cursor_gstack/supabase"
    _link_or_copy "$gstack_dir/supabase/config.sh" "$cursor_gstack/supabase/config.sh"
  fi
}

# Plant runtime assets into the repo-local generated skill dir so in-repo
# GSTACK_ROOT (preamble prefers $_ROOT/.cursor/skills/gstack) has bin/.
# NEVER wipe this directory — it holds the generated SKILL.md files.
create_cursor_sidecar() {
  local repo_root="$1"
  local cursor_gstack="$repo_root/.cursor/skills/gstack"
  local cursor_dir="$repo_root/.cursor/skills"

  # #2142: same user-ownership gate as create_agents_sidecar — but the
  # generated tree's own root (cursor_dir/gstack carries the banner) always
  # passes, so normal installs refresh as before.
  if _sidecar_root_user_owned "$cursor_gstack"; then
    echo "  left in place (existing dir not gstack-managed — no generated banner): $cursor_gstack" >&2
    return 0
  fi

  mkdir -p "$cursor_gstack" "$cursor_gstack/browse" "$cursor_gstack/gstack-upgrade" "$cursor_gstack/review"

  if [ -d "$repo_root/bin" ]; then
    if [ "$IS_WINDOWS" -eq 1 ] || [ -L "$cursor_gstack/bin" ] || [ ! -e "$cursor_gstack/bin" ]; then
      _link_or_copy "$repo_root/bin" "$cursor_gstack/bin"
    fi
  fi
  if [ -d "$repo_root/lib" ]; then
    if [ "$IS_WINDOWS" -eq 1 ] || [ -L "$cursor_gstack/lib" ] || [ ! -e "$cursor_gstack/lib" ]; then
      _link_or_copy "$repo_root/lib" "$cursor_gstack/lib"
    fi
  fi
  if [ -d "$repo_root/browse/dist" ]; then
    if [ "$IS_WINDOWS" -eq 1 ] || [ -L "$cursor_gstack/browse/dist" ] || [ ! -e "$cursor_gstack/browse/dist" ]; then
      _link_or_copy "$repo_root/browse/dist" "$cursor_gstack/browse/dist"
    fi
  fi
  if [ -d "$repo_root/browse/bin" ]; then
    if [ "$IS_WINDOWS" -eq 1 ] || [ -L "$cursor_gstack/browse/bin" ] || [ ! -e "$cursor_gstack/browse/bin" ]; then
      _link_or_copy "$repo_root/browse/bin" "$cursor_gstack/browse/bin"
    fi
  fi
  if [ -f "$cursor_dir/gstack-upgrade/SKILL.md" ]; then
    if [ "$IS_WINDOWS" -eq 1 ] || [ -L "$cursor_gstack/gstack-upgrade/SKILL.md" ] || [ ! -e "$cursor_gstack/gstack-upgrade/SKILL.md" ]; then
      _link_or_copy "$cursor_dir/gstack-upgrade/SKILL.md" "$cursor_gstack/gstack-upgrade/SKILL.md"
    fi
  fi
  for f in checklist.md TODOS-format.md; do
    if [ -f "$repo_root/review/$f" ]; then
      if [ "$IS_WINDOWS" -eq 1 ] || [ -L "$cursor_gstack/review/$f" ] || [ ! -e "$cursor_gstack/review/$f" ]; then
        _link_or_copy "$repo_root/review/$f" "$cursor_gstack/review/$f"
      fi
    fi
  done
  if [ -f "$repo_root/ETHOS.md" ]; then
    if [ "$IS_WINDOWS" -eq 1 ] || [ -L "$cursor_gstack/ETHOS.md" ] || [ ! -e "$cursor_gstack/ETHOS.md" ]; then
      _link_or_copy "$repo_root/ETHOS.md" "$cursor_gstack/ETHOS.md"
    fi
  fi
}

link_cursor_skill_dirs() {
  local gstack_dir="$1"
  local skills_dir="$2"
  local cursor_dir="$gstack_dir/.cursor/skills"
  local linked=()

  if [ ! -d "$cursor_dir" ]; then
    echo "  Generating .cursor/ skill docs..."
    ( cd "$gstack_dir" && bun_cmd run gen:skill-docs --host cursor )
  fi

  if [ ! -d "$cursor_dir" ]; then
    echo "  warning: .cursor/skills/ generation failed — run 'bun run gen:skill-docs --host cursor' manually" >&2
    return 1
  fi

  for skill_dir in "$cursor_dir"/gstack*/; do
    if [ -f "$skill_dir/SKILL.md" ]; then
      skill_name="$(basename "$skill_dir")"
      [ "$skill_name" = "gstack" ] && continue
      target="$skills_dir/$skill_name"
      # #2444: IS_WINDOWS bypass — real-dir copies never match -L, so re-runs
      # skipped the refresh. Only replace a symlink, a missing path, or a
      # PROVABLY gstack-managed real dir; never a user's own Cursor skill
      # dir that merely starts with gstack (#2142).
      if [ "$IS_WINDOWS" -eq 1 ] || [ -L "$target" ] || [ ! -e "$target" ]; then
        if _owned_for_windows_refresh "$target"; then
          _link_or_copy "$skill_dir" "$target"
          linked+=("$skill_name")
        else
          echo "  left in place (existing dir not gstack-managed — no generated banner): $target" >&2
        fi
      fi
    fi
  done
  if [ ${#linked[@]} -gt 0 ]; then
    echo "  linked skills: ${linked[*]}"
  fi
}

# 4. Install for Claude (default)
SKILLS_BASENAME="$(basename "$INSTALL_SKILLS_DIR")"
SKILLS_PARENT_BASENAME="$(basename "$(dirname "$INSTALL_SKILLS_DIR")")"
CODEX_REPO_LOCAL=0
if [ "$SKILLS_BASENAME" = "skills" ] && [ "$SKILLS_PARENT_BASENAME" = ".agents" ]; then
  CODEX_REPO_LOCAL=1
fi

if [ "$INSTALL_CLAUDE" -eq 1 ]; then
  if [ "$SKILLS_BASENAME" = "skills" ]; then
    # Clean up stale symlinks from the opposite prefix mode
    if [ "$SKILL_PREFIX" -eq 1 ]; then
      cleanup_old_claude_symlinks "$SOURCE_GSTACK_DIR" "$INSTALL_SKILLS_DIR"
    else
      cleanup_prefixed_claude_symlinks "$SOURCE_GSTACK_DIR" "$INSTALL_SKILLS_DIR"
    fi
    # Patch name: fields BEFORE creating symlinks so link_claude_skill_dirs
    # reads the correct (patched) name: values for symlink naming
    "$SOURCE_GSTACK_DIR/bin/gstack-patch-names" "$SOURCE_GSTACK_DIR" "$SKILL_PREFIX"
    link_claude_skill_dirs "$SOURCE_GSTACK_DIR" "$INSTALL_SKILLS_DIR"
    link_claude_root_skill_alias "$SOURCE_GSTACK_DIR" "$INSTALL_SKILLS_DIR"
    _CLAUDE_SKILLS_LINKED=1
    # Self-healing: re-run gstack-relink to ensure name: fields and directory
    # names are consistent with the config. This catches cases where an interrupted
    # setup, stale git state, or gen:skill-docs left name: fields out of sync.
    GSTACK_RELINK="$SOURCE_GSTACK_DIR/bin/gstack-relink"
    if [ -x "$GSTACK_RELINK" ]; then
      GSTACK_SKILLS_DIR="$INSTALL_SKILLS_DIR" GSTACK_INSTALL_DIR="$SOURCE_GSTACK_DIR" "$GSTACK_RELINK" >/dev/null 2>&1 || true
    fi
    # Backwards-compat alias: /connect-chrome → /open-gstack-browser
    # Rewritten copy, not a symlink: a symlinked alias re-serves the canonical
    # name: open-gstack-browser, so one of the two silently shadows the other
    # (#2201) — and duplicate names can drop the whole skill set (#2511).
    _OGB_LINK="$INSTALL_SKILLS_DIR/connect-chrome"
    _OGB_ALIAS_NAME="connect-chrome"
    if [ "$SKILL_PREFIX" -eq 1 ]; then
      _OGB_LINK="$INSTALL_SKILLS_DIR/gstack-connect-chrome"
      _OGB_ALIAS_NAME="gstack-connect-chrome"
    fi
    _install_alias_skill_md "$SOURCE_GSTACK_DIR/open-gstack-browser/SKILL.md" "$_OGB_LINK" "$_OGB_ALIAS_NAME"
    if [ "$LOCAL_INSTALL" -eq 1 ]; then
      log "gstack ready (project-local)."
      log "  skills: $INSTALL_SKILLS_DIR"
    else
      log "gstack ready (claude)."
    fi
    log "  browse: $BROWSE_BIN"
  else
    # Not inside a skills/ directory — would symlink the source into
    # ~/.claude/skills/gstack/ and register from there.
    CLAUDE_SKILLS_DIR="$HOME/.claude/skills"
    CLAUDE_GSTACK_LINK="$CLAUDE_SKILLS_DIR/gstack"

    # Conductor worktree guard: if ~/.claude/skills/gstack is already a real
    # (non-symlink) directory pointing to a *different* install, refuse to plant
    # a symlink there. On macOS/BSD, `ln -snf SRC DST` won't replace a real DST;
    # it creates DST/$(basename SRC) → SRC inside it. The result is per-worktree
    # symlinks leaking into the global install that Claude Code picks up as
    # separate top-level skills (dublin-v1, lincoln-v2, ...). Typical trigger:
    # running ./setup from a Conductor worktree of the gstack repo itself.
    _SKIP_CLAUDE_REGISTER=0
    if [ -d "$CLAUDE_GSTACK_LINK" ] && [ ! -L "$CLAUDE_GSTACK_LINK" ]; then
      _EXISTING_REAL=$(cd "$CLAUDE_GSTACK_LINK" 2>/dev/null && pwd -P || echo "")
      if [ -n "$_EXISTING_REAL" ] && [ "$_EXISTING_REAL" != "$SOURCE_GSTACK_DIR" ]; then
        _SKIP_CLAUDE_REGISTER=1
      fi
    fi

    if [ "$_SKIP_CLAUDE_REGISTER" -eq 1 ]; then
      log ""
      log "  $CLAUDE_GSTACK_LINK already exists as a separate global install."
      log "  Skipping Claude skill registration to avoid polluting it with"
      log "  per-worktree symlinks. (Binaries still built locally for dev.)"
      log ""
      log "    Global install:  $CLAUDE_GSTACK_LINK"
      log "    This worktree:   $SOURCE_GSTACK_DIR"
      log ""
      log "  To register this worktree as the active gstack, remove the global"
      log "  install first:  rm -rf $CLAUDE_GSTACK_LINK"
      log ""
      log "gstack built (claude registration skipped)."
      log "  browse: $BROWSE_BIN"
    else
      mkdir -p "$CLAUDE_SKILLS_DIR"
      _link_or_copy "$SOURCE_GSTACK_DIR" "$CLAUDE_GSTACK_LINK"
      log "  symlinked $CLAUDE_GSTACK_LINK -> $SOURCE_GSTACK_DIR"
      INSTALL_SKILLS_DIR="$CLAUDE_SKILLS_DIR"
      INSTALL_GSTACK_DIR="$CLAUDE_GSTACK_LINK"
      # Clean up stale symlinks from the opposite prefix mode
      if [ "$SKILL_PREFIX" -eq 1 ]; then
        cleanup_old_claude_symlinks "$SOURCE_GSTACK_DIR" "$INSTALL_SKILLS_DIR"
      else
        cleanup_prefixed_claude_symlinks "$SOURCE_GSTACK_DIR" "$INSTALL_SKILLS_DIR"
      fi
      "$SOURCE_GSTACK_DIR/bin/gstack-patch-names" "$SOURCE_GSTACK_DIR" "$SKILL_PREFIX"
      link_claude_skill_dirs "$SOURCE_GSTACK_DIR" "$INSTALL_SKILLS_DIR"
      link_claude_root_skill_alias "$SOURCE_GSTACK_DIR" "$INSTALL_SKILLS_DIR"
      _CLAUDE_SKILLS_LINKED=1
      GSTACK_RELINK="$SOURCE_GSTACK_DIR/bin/gstack-relink"
      if [ -x "$GSTACK_RELINK" ]; then
        GSTACK_SKILLS_DIR="$INSTALL_SKILLS_DIR" GSTACK_INSTALL_DIR="$SOURCE_GSTACK_DIR" "$GSTACK_RELINK" >/dev/null 2>&1 || true
      fi
      # Rewritten copy, not a symlink: a symlinked alias re-serves the
      # canonical name: open-gstack-browser, so one of the two silently
      # shadows the other (#2201) — and duplicate names can drop the whole
      # skill set (#2511).
      _OGB_LINK="$INSTALL_SKILLS_DIR/connect-chrome"
      _OGB_ALIAS_NAME="connect-chrome"
      if [ "$SKILL_PREFIX" -eq 1 ]; then
        _OGB_LINK="$INSTALL_SKILLS_DIR/gstack-connect-chrome"
        _OGB_ALIAS_NAME="gstack-connect-chrome"
      fi
      _install_alias_skill_md "$SOURCE_GSTACK_DIR/open-gstack-browser/SKILL.md" "$_OGB_LINK" "$_OGB_ALIAS_NAME"
      log "gstack ready (claude)."
      log "  browse: $BROWSE_BIN"
    fi
  fi
fi

# 5. Install for Codex
if [ "$INSTALL_CODEX" -eq 1 ]; then
  if [ "$CODEX_REPO_LOCAL" -eq 1 ]; then
    CODEX_SKILLS="$INSTALL_SKILLS_DIR"
    CODEX_GSTACK="$INSTALL_GSTACK_DIR"
  fi
  mkdir -p "$CODEX_SKILLS"

  # Skip runtime root creation for repo-local installs — the checkout IS the runtime root.
  # create_codex_runtime_root would create self-referential symlinks (bin → bin, etc.).
  if [ "$CODEX_REPO_LOCAL" -eq 0 ]; then
    create_codex_runtime_root "$SOURCE_GSTACK_DIR" "$CODEX_GSTACK"
  fi
  # Install generated Codex-format skills (not Claude source dirs)
  link_codex_skill_dirs "$SOURCE_GSTACK_DIR" "$CODEX_SKILLS"

  log "gstack ready (codex)."
  log "  browse: $BROWSE_BIN"
  log "  codex skills: $CODEX_SKILLS"
fi

# 6. Install for Kiro CLI (copy from .agents/skills, rewrite paths)
if [ "$INSTALL_KIRO" -eq 1 ]; then
  KIRO_SKILLS="$HOME/.kiro/skills"
  AGENTS_DIR="$SOURCE_GSTACK_DIR/.agents/skills"
  mkdir -p "$KIRO_SKILLS"

  # Create gstack dir with symlinks for runtime assets, copy+sed for SKILL.md
  KIRO_GSTACK="$KIRO_SKILLS/gstack"
  # Remove old whole-dir symlink from previous installs
  [ -L "$KIRO_GSTACK" ] && rm -f "$KIRO_GSTACK"
  mkdir -p "$KIRO_GSTACK" "$KIRO_GSTACK/browse" "$KIRO_GSTACK/gstack-upgrade" "$KIRO_GSTACK/review"
  _link_or_copy "$SOURCE_GSTACK_DIR/bin" "$KIRO_GSTACK/bin"
  _link_or_copy "$SOURCE_GSTACK_DIR/lib" "$KIRO_GSTACK/lib"
  _link_or_copy "$SOURCE_GSTACK_DIR/browse/dist" "$KIRO_GSTACK/browse/dist"
  _link_or_copy "$SOURCE_GSTACK_DIR/browse/bin" "$KIRO_GSTACK/browse/bin"
  # ETHOS.md — referenced by "Search Before Building" in all skill preambles
  if [ -f "$SOURCE_GSTACK_DIR/ETHOS.md" ]; then
    _link_or_copy "$SOURCE_GSTACK_DIR/ETHOS.md" "$KIRO_GSTACK/ETHOS.md"
  fi
  # supabase/config.sh — required by gstack-telemetry-sync to resolve GSTACK_SUPABASE_URL
  if [ -f "$SOURCE_GSTACK_DIR/supabase/config.sh" ]; then
    mkdir -p "$KIRO_GSTACK/supabase"
    _link_or_copy "$SOURCE_GSTACK_DIR/supabase/config.sh" "$KIRO_GSTACK/supabase/config.sh"
  fi
  # gstack-upgrade skill
  if [ -f "$AGENTS_DIR/gstack-upgrade/SKILL.md" ]; then
    _link_or_copy "$AGENTS_DIR/gstack-upgrade/SKILL.md" "$KIRO_GSTACK/gstack-upgrade/SKILL.md"
  fi
  # Review runtime assets (individual files, not whole dir)
  for f in checklist.md design-checklist.md greptile-triage.md TODOS-format.md; do
    if [ -f "$SOURCE_GSTACK_DIR/review/$f" ]; then
      _link_or_copy "$SOURCE_GSTACK_DIR/review/$f" "$KIRO_GSTACK/review/$f"
    fi
  done

  # Rewrite root SKILL.md paths for Kiro
  sed -e "s|~/.claude/skills/gstack|~/.kiro/skills/gstack|g" \
      -e "s|\.claude/skills/gstack|.kiro/skills/gstack|g" \
      -e "s|\.claude/skills|.kiro/skills|g" \
      "$SOURCE_GSTACK_DIR/SKILL.md" > "$KIRO_GSTACK/SKILL.md"

  if [ ! -d "$AGENTS_DIR" ]; then
    echo "  warning: no .agents/skills/ directory found — run 'bun run build' first" >&2
  else
    for skill_dir in "$AGENTS_DIR"/gstack*/; do
      [ -f "$skill_dir/SKILL.md" ] || continue
      skill_name="$(basename "$skill_dir")"
      target_dir="$KIRO_SKILLS/$skill_name"
      mkdir -p "$target_dir"
      # Generated Codex skills use $HOME/.codex (not ~/), plus $GSTACK_ROOT variables.
      # Rewrite the default GSTACK_ROOT value and any remaining literal paths.
      sed -e 's|\$HOME/.codex/skills/gstack|$HOME/.kiro/skills/gstack|g' \
          -e "s|~/.codex/skills/gstack|~/.kiro/skills/gstack|g" \
          -e "s|~/.claude/skills/gstack|~/.kiro/skills/gstack|g" \
          "$skill_dir/SKILL.md" > "$target_dir/SKILL.md"
      # Carved skills (v2 plan T9): rewrite + copy each sections/*.md the same way,
      # so a runtime "Read sections/<name>.md" resolves under ~/.kiro and doesn't
      # leak a ~/.codex or ~/.claude path. Kiro builds from the codex output, so
      # these section files only exist for skills that have been carved.
      if [ -d "$skill_dir/sections" ]; then
        mkdir -p "$target_dir/sections"
        for section_file in "$skill_dir/sections"/*; do
          [ -f "$section_file" ] || continue
          sed -e 's|\$HOME/.codex/skills/gstack|$HOME/.kiro/skills/gstack|g' \
              -e "s|~/.codex/skills/gstack|~/.kiro/skills/gstack|g" \
              -e "s|~/.claude/skills/gstack|~/.kiro/skills/gstack|g" \
              "$section_file" > "$target_dir/sections/$(basename "$section_file")"
        done
      fi
    done
    echo "gstack ready (kiro)."
    echo "  browse: $BROWSE_BIN"
    echo "  kiro skills: $KIRO_SKILLS"
  fi
fi

# 6b. Install for Factory Droid
if [ "$INSTALL_FACTORY" -eq 1 ]; then
  mkdir -p "$FACTORY_SKILLS"
  create_factory_runtime_root "$SOURCE_GSTACK_DIR" "$FACTORY_GSTACK"
  link_factory_skill_dirs "$SOURCE_GSTACK_DIR" "$FACTORY_SKILLS"
  echo "gstack ready (factory)."
  echo "  browse: $BROWSE_BIN"
  echo "  factory skills: $FACTORY_SKILLS"
fi

# 6c. Install for OpenCode
if [ "$INSTALL_OPENCODE" -eq 1 ]; then
  mkdir -p "$OPENCODE_SKILLS"
  create_opencode_runtime_root "$SOURCE_GSTACK_DIR" "$OPENCODE_GSTACK"
  link_opencode_skill_dirs "$SOURCE_GSTACK_DIR" "$OPENCODE_SKILLS"
  echo "gstack ready (opencode)."
  echo "  browse: $BROWSE_BIN"
  echo "  opencode skills: $OPENCODE_SKILLS"
fi

# 6d. Install for Cursor
if [ "$INSTALL_CURSOR" -eq 1 ]; then
  mkdir -p "$CURSOR_SKILLS"
  create_cursor_runtime_root "$SOURCE_GSTACK_DIR" "$CURSOR_GSTACK"
  # Link before sidecar. Sidecar mkdir -p creates .cursor/skills/gstack, which
  # would make link_cursor_skill_dirs' "[ ! -d generated ]" gen fallback a no-op.
  link_cursor_skill_dirs "$SOURCE_GSTACK_DIR" "$CURSOR_SKILLS"
  create_cursor_sidecar "$SOURCE_GSTACK_DIR"
  echo "gstack ready (cursor)."
  echo "  browse: $BROWSE_BIN"
  echo "  cursor skills: $CURSOR_SKILLS"
fi

# 7. Create .agents/ sidecar symlinks for the real Codex skill target.
# The root Codex skill ends up pointing at $SOURCE_GSTACK_DIR/.agents/skills/gstack,
# so the runtime assets must live there for both global and repo-local installs.
if [ "$INSTALL_CODEX" -eq 1 ]; then
  create_agents_sidecar "$SOURCE_GSTACK_DIR"
fi

# 8. Run pending version migrations
# Migrations handle state fixes that ./setup alone can't cover (stale config,
# orphaned files, directory structure changes). Each migration is idempotent.
MIGRATIONS_DIR="$SOURCE_GSTACK_DIR/gstack-upgrade/migrations"
CURRENT_VERSION=$(cat "$SOURCE_GSTACK_DIR/VERSION" 2>/dev/null || echo "unknown")
LAST_SETUP_VERSION=$(cat "$HOME/.gstack/.last-setup-version" 2>/dev/null || echo "0.0.0.0")
if [ -d "$MIGRATIONS_DIR" ] && [ "$CURRENT_VERSION" != "unknown" ] && [ "$LAST_SETUP_VERSION" != "$CURRENT_VERSION" ]; then
  # Fresh install (no marker file) — skip migrations, just write marker
  if [ ! -f "$HOME/.gstack/.last-setup-version" ]; then
    : # fall through to marker write below
  else
    find "$MIGRATIONS_DIR" -maxdepth 1 -name 'v*.sh' -type f 2>/dev/null | sort -V | while IFS= read -r migration; do
      m_ver="$(basename "$migration" .sh | sed 's/^v//')"
      # Run if migration is newer than last setup version AND not newer than current version
      if [ "$(printf '%s\n%s' "$LAST_SETUP_VERSION" "$m_ver" | sort -V | head -1)" = "$LAST_SETUP_VERSION" ] && [ "$LAST_SETUP_VERSION" != "$m_ver" ] \
         && [ "$(printf '%s\n%s' "$m_ver" "$CURRENT_VERSION" | sort -V | tail -1)" = "$CURRENT_VERSION" ]; then
        echo "  running migration $m_ver..."
        # GSTACK_INSTALL_DIR: migrations that clean the INSTALL (not just
        # ~/.gstack state) default to ~/.claude/skills/gstack when unset —
        # a repo-local ./setup would silently no-op them against the wrong
        # tree without this.
        GSTACK_INSTALL_DIR="$SOURCE_GSTACK_DIR" bash "$migration" || echo "  warning: migration $m_ver had errors (non-fatal)"
      fi
    done
  fi
fi
mkdir -p "$HOME/.gstack"
if [ "$CURRENT_VERSION" != "unknown" ]; then
  echo "$CURRENT_VERSION" > "$HOME/.gstack/.last-setup-version"
fi

# 9. First-time welcome + legacy cleanup
if [ ! -f "$HOME/.gstack/.welcome-seen" ]; then
  log ""
  log "  gstack is ready. First move:"
  log "    New idea / empty repo?   /office-hours  or  /spec"
  log "    Existing code?           /qa  to see it work, or  /investigate"
  log "  (Run /gstack-upgrade anytime to stay current)"
  log ""
  # Best-effort onboarding telemetry (respects telemetry!=off; never blocks setup).
  if [ -x "$SOURCE_GSTACK_DIR/bin/gstack-telemetry-log" ]; then
    "$SOURCE_GSTACK_DIR/bin/gstack-telemetry-log" --event-type onboarding --skill _setup_welcome --outcome shown >/dev/null 2>&1 || true
  fi
  touch "$HOME/.gstack/.welcome-seen"
fi
rm -f /tmp/gstack-latest-version

# 10. Team mode: register/unregister SessionStart hook
SETTINGS_HOOK="$SOURCE_GSTACK_DIR/bin/gstack-settings-hook"
# On Windows (Git Bash / MSYS2 / Cygwin), extensionless scripts can't be
# launched directly by the OS — the file-association dialog appears instead.
# Prefix with 'bash' so Claude Code's hook runner invokes Git Bash explicitly.
if [ "$IS_WINDOWS" -eq 1 ]; then
  HOOK_CMD="bash $SOURCE_GSTACK_DIR/bin/gstack-session-update"
else
  HOOK_CMD="$SOURCE_GSTACK_DIR/bin/gstack-session-update"
fi

if [ "$TEAM_MODE" -eq 1 ]; then
  "$GSTACK_CONFIG" set auto_upgrade true 2>/dev/null || true
  "$GSTACK_CONFIG" set team_mode true 2>/dev/null || true

  # Register SessionStart hook in Claude Code settings
  if [ -x "$SETTINGS_HOOK" ]; then
    "$SETTINGS_HOOK" add "$HOOK_CMD" 2>/dev/null || true
  fi

  log ""
  log "Team mode enabled: gstack will auto-update at the start of each Claude Code session."
  log "  Hook: $HOOK_CMD"
  log "  To disable: ./setup --no-team"
  log ""
  log "Bootstrap your repo:"
  log "  cd <your-repo> && $SOURCE_GSTACK_DIR/bin/gstack-team-init required"
fi

if [ "$NO_TEAM_MODE" -eq 1 ]; then
  "$GSTACK_CONFIG" set auto_upgrade false 2>/dev/null || true
  "$GSTACK_CONFIG" set team_mode false 2>/dev/null || true

  # Remove SessionStart hook from Claude Code settings
  if [ -x "$SETTINGS_HOOK" ]; then
    "$SETTINGS_HOOK" remove "$HOOK_CMD" 2>/dev/null || true
  fi

  log "Team mode disabled: auto-update hook removed."
fi

# ─── GBrain detection + conditional SKILL.md render ─────────────────────
#
# Detect whether gbrain is installed and persist the result to
# ~/.gstack/gbrain-detection.json so gen-skill-docs can decide whether to
# render GBRAIN_CONTEXT_LOAD and GBRAIN_SAVE_RESULTS blocks. If detected,
# render the Claude-host :user variant (un-suppressed brain-aware blocks)
# into an UNTRACKED out-dir — ${GSTACK_HOME}/render/claude — and repoint the
# installed skills at it (#2569). The old in-place render wrote into TRACKED
# files of the install checkout, so a global-git install stayed permanently
# dirty and every upgrade stashed 16 files of generated dirt.
#
# If gbrain is not detected, the canonical no-gbrain SKILL.md files stay
# as-is (zero token overhead) and any stale render dir is removed so it
# can't shadow canonical files on the next relink.
#
# Users who install gbrain after running ./setup should re-run setup OR
# call `gstack-config gbrain-refresh`.
DETECT_BIN="$SOURCE_GSTACK_DIR/bin/gstack-gbrain-detect"
GBRAIN_STATE_DIR="${GSTACK_HOME:-$HOME/.gstack}"
DETECTION_FILE="$GBRAIN_STATE_DIR/gbrain-detection.json"
_GSTACK_RENDER_DIR="${GSTACK_USER_RENDER_DIR:-$GBRAIN_STATE_DIR/render/claude}"
# PID-unique tmp so concurrent setups (parallel Conductor workspaces) can't
# clobber each other's in-flight detection write.
DETECTION_TMP="$DETECTION_FILE.$$.tmp"
mkdir -p "$GBRAIN_STATE_DIR"
if [ -x "$DETECT_BIN" ]; then
  if "$DETECT_BIN" > "$DETECTION_TMP" 2>/dev/null; then
    mv "$DETECTION_TMP" "$DETECTION_FILE"
    # Single source of truth for "is gbrain usable" — `--is-ok` runs live
    # detection (exit 0 iff ok), so setup, bin/dev-setup, and gstack-config
    # all gate on the same check instead of re-grepping the JSON.
    if "$DETECT_BIN" --is-ok 2>/dev/null; then
      if [ -n "${GSTACK_SKIP_GBRAIN_REGEN:-}" ]; then
        # Dev/source tree (set by bin/dev-setup): detection is persisted
        # above; the dev workspace renders the :user variant into its own
        # untracked dir (.claude/gstack-rendered), and other projects get
        # blocks via `gstack-config gbrain-refresh`.
        log "gbrain detected — GSTACK_SKIP_GBRAIN_REGEN set: leaving tracked SKILL.md canonical (dev/source tree)."
      else
        log "gbrain detected — rendering brain-aware Claude SKILL.md into $_GSTACK_RENDER_DIR (~250 token overhead per planning skill; source checkout stays clean)..."
        # Render into a tmp dir and swap it in only on SUCCESS. Installed
        # skills SYMLINK into the render dir (relink prefers it), so wiping
        # it before the render meant one transient failure left every
        # brain-aware SKILL.md link dangling — the whole skill set vanished
        # from Claude Code until a successful re-render.
        _GSTACK_RENDER_TMP="$_GSTACK_RENDER_DIR.tmp.$$"
        rm -rf "$_GSTACK_RENDER_TMP"
        if (
          cd "$SOURCE_GSTACK_DIR"
          # No pipe before the || guard: `cmd | tail -3` reports TAIL's exit
          # status, so a generator crash read as success (same masking the
          # main gen:skill-docs site had). Capture, show the tail, propagate.
          _GEN_USER_OUT=$(bun_cmd run gen:skill-docs:user --host claude --out-dir "$_GSTACK_RENDER_TMP" 2>&1)
          _GEN_USER_RC=$?
          printf '%s\n' "$_GEN_USER_OUT" | tail -3
          exit "$_GEN_USER_RC"
        ); then
          _swap_in_render "$_GSTACK_RENDER_DIR" "$_GSTACK_RENDER_TMP"
          # Repoint the installed skills at the fresh render — the installer
          # prefers rendered files when present (#2569).
          if [ "${_CLAUDE_SKILLS_LINKED:-0}" -eq 1 ]; then
            link_claude_skill_dirs "$SOURCE_GSTACK_DIR" "$INSTALL_SKILLS_DIR" >/dev/null
          fi
        else
          rm -rf "$_GSTACK_RENDER_TMP"
          log "  warning: gen:skill-docs:user failed — previous render (if any) left in place, links stay valid. Run 'bun run gen:skill-docs:user --host claude --out-dir $_GSTACK_RENDER_DIR' manually if you want fresh brain-aware blocks"
        fi
      fi
    else
      log "gbrain not detected — brain-aware blocks suppressed in planning-skill SKILL.md files (zero token overhead)."
      log "  To enable: install gbrain via /setup-gbrain, then re-run ./setup or 'gstack-config gbrain-refresh'."
      # A render from a previous gbrain install would shadow canonical files
      # on the next link/relink — drop it and restore canonical links.
      if [ -d "$_GSTACK_RENDER_DIR" ] && [ -z "${GSTACK_SKIP_GBRAIN_REGEN:-}" ]; then
        rm -rf "$_GSTACK_RENDER_DIR"
        if [ "${_CLAUDE_SKILLS_LINKED:-0}" -eq 1 ]; then
          link_claude_skill_dirs "$SOURCE_GSTACK_DIR" "$INSTALL_SKILLS_DIR" >/dev/null
        fi
      fi
    fi
  else
    rm -f "$DETECTION_TMP"
    log "  warning: gstack-gbrain-detect failed — brain-aware blocks will stay suppressed"
  fi
fi

# 11. Plan-tune cathedral hook install (T8).
#
# Registers PostToolUse (deterministic AUQ capture) + PreToolUse (preference
# enforcement) hooks in ~/.claude/settings.json so /plan-tune actually does
# something at runtime instead of being agent-convention. Explicit consent UX
# per D4 + Codex: never mutate settings.json silently.
#
# Idempotent via _gstack_source tag = 'plan-tune-cathedral'. If both hooks
# already registered under that tag, the install is a no-op (no prompt).
PLAN_TUNE_LOG_HOOK="$SOURCE_GSTACK_DIR/hosts/claude/hooks/question-log-hook"
PLAN_TUNE_PREF_HOOK="$SOURCE_GSTACK_DIR/hosts/claude/hooks/question-preference-hook"
AUQ_ERROR_FALLBACK_HOOK="$SOURCE_GSTACK_DIR/hosts/claude/hooks/auq-error-fallback-hook"
PLAN_TUNE_INSTALL_MARKER="$HOME/.gstack/.plan-tune-hooks-prompted"

if [ "$NO_TEAM_MODE" -ne 1 ] \
   && [ -x "$SETTINGS_HOOK" ] \
   && [ -x "$PLAN_TUNE_LOG_HOOK" ] \
   && [ -x "$PLAN_TUNE_PREF_HOOK" ]; then

  # Already installed? Require BOTH the plan-tune source AND the AUQ-error-fallback
  # source — so an existing install that predates the fallback hook re-runs the
  # install (which is idempotent for the plan-tune hooks) and picks up the new one.
  ALREADY_INSTALLED=0
  _HOOK_SOURCES=$("$SETTINGS_HOOK" list-sources 2>/dev/null || true)
  if printf '%s' "$_HOOK_SOURCES" | grep -q "plan-tune-cathedral" \
     && printf '%s' "$_HOOK_SOURCES" | grep -q "auq-error-fallback"; then
    ALREADY_INSTALLED=1
  fi

  # Resolve the desired action without ever blocking.
  # Priority: CLI flag (--plan-tune-hooks / --no-plan-tune-hooks)
  #         > env (GSTACK_PLAN_TUNE_HOOKS=yes|no)
  #         > saved config (plan_tune_hooks)
  #         > smart default ("prompt" → timed prompt on a real TTY, else skip).
  # This guarantees scripted/workspace setups (conductor, CI) are never
  # interactive: pass --no-plan-tune-hooks (or --plan-tune-hooks) and the
  # block runs to completion with no `read`.
  PT_DECISION="$PLAN_TUNE_HOOKS_MODE"
  [ -z "$PT_DECISION" ] && PT_DECISION="${GSTACK_PLAN_TUNE_HOOKS:-}"
  [ -z "$PT_DECISION" ] && PT_DECISION="$("$GSTACK_CONFIG" get plan_tune_hooks 2>/dev/null || true)"
  # Normalize: strip whitespace + lowercase so "YES", "Yes", " yes" from a flag
  # or env var all resolve correctly (an unrecognized opt-in must NOT silently
  # downgrade to skip). Unknown values fall through to "prompt".
  PT_DECISION=$(printf '%s' "$PT_DECISION" | tr '[:upper:]' '[:lower:]' | tr -d '[:space:]')
  case "$PT_DECISION" in
    y|yes|true|install|on|1) PT_DECISION="yes" ;;
    n|no|false|skip|off|0)   PT_DECISION="no" ;;
    *)                       PT_DECISION="prompt" ;;
  esac

  # Conductor host reliability: the PreToolUse preference hook also carries the
  # Conductor-prose enforcement (deny the flaky mcp__conductor__AskUserQuestion,
  # redirect to a prose decision brief). A Conductor workspace setup otherwise
  # falls through to "prompt" → the non-interactive skip below, leaving Conductor
  # users without that backstop. Treat Conductor as an implicit opt-in — but
  # only on the silent fall-through, never overriding an explicit --no-plan-tune-hooks.
  if [ "$PT_DECISION" = "prompt" ] && { [ -n "${CONDUCTOR_WORKSPACE_PATH:-}" ] || [ -n "${CONDUCTOR_PORT:-}" ]; }; then
    PT_DECISION="yes"
    _PT_CONDUCTOR_AUTO=1
  fi

  _install_plan_tune_hooks() {
    "$SETTINGS_HOOK" add-event \
      --event PostToolUse \
      --matcher '(AskUserQuestion|mcp__.*__AskUserQuestion)' \
      --command "$PLAN_TUNE_LOG_HOOK" \
      --source plan-tune-cathedral \
      --timeout 5
    "$SETTINGS_HOOK" add-event \
      --event PreToolUse \
      --matcher '(AskUserQuestion|mcp__.*__AskUserQuestion)' \
      --command "$PLAN_TUNE_PREF_HOOK" \
      --source plan-tune-cathedral \
      --timeout 5
    # AskUserQuestion-failure prose-fallback reliability hook (OV3:B). Fires only when
    # an AskUserQuestion call returns an error/missing result; inert on success and
    # inert if the platform doesn't invoke PostToolUse on tool errors. MUST use its
    # OWN source tag: gstack-settings-hook dedupes by (event, matcher, source) and
    # REPLACES the entry's hooks, so sharing 'plan-tune-cathedral' would overwrite the
    # question-log capture hook (same event+matcher). A distinct source = a second
    # PostToolUse entry; both run in parallel.
    if [ -x "$AUQ_ERROR_FALLBACK_HOOK" ]; then
      "$SETTINGS_HOOK" add-event \
        --event PostToolUse \
        --matcher '(AskUserQuestion|mcp__.*__AskUserQuestion)' \
        --command "$AUQ_ERROR_FALLBACK_HOOK" \
        --source auq-error-fallback \
        --timeout 5
    fi
  }

  if [ "$ALREADY_INSTALLED" -eq 1 ]; then
    log ""
    log "Plan-tune hooks already installed. Run \`$SETTINGS_HOOK list-sources\` to inspect."
  elif [ "$PT_DECISION" = "yes" ]; then
    # Explicit opt-in (flag / env / config) or Conductor implicit opt-in. Non-interactive.
    _install_plan_tune_hooks
    log ""
    if [ "${_PT_CONDUCTOR_AUTO:-0}" -eq 1 ]; then
      log "AskUserQuestion reliability hooks installed (Conductor detected): decisions"
      log "render as a prose brief instead of the flaky AskUserQuestion tool. Inspect with /plan-tune."
    else
      log "Plan-tune hooks installed. Run /plan-tune anytime to inspect."
    fi
    touch "$PLAN_TUNE_INSTALL_MARKER"
  elif [ "$PT_DECISION" = "no" ]; then
    # Explicit opt-out (flag / env / config). Non-interactive.
    log ""
    log "Plan-tune cathedral hooks not installed (opted out)."
    log "Install later with: ./setup --plan-tune-hooks  (or /update-config)."
    touch "$PLAN_TUNE_INSTALL_MARKER"
  elif [ -f "$PLAN_TUNE_INSTALL_MARKER" ]; then
    # Previously declined. Don't re-ask. User can re-enable via /update-config.
    :
  elif [ "$QUIET" -ne 1 ] && [ -t 0 ] && [ -t 1 ]; then
    # Real interactive terminal with no recorded preference: ask, with explicit
    # consent + diff preview. The read is time-bounded and defaults to "skip" so
    # it can never hang an automated/forwarded TTY (the conductor failure mode).
    _PT_PROMPT_TIMEOUT=10  # single source of truth for the read + the countdown text
    log ""
    log "──────────────────────────────────────────────────────────"
    log "Plan-tune cathedral: install Claude Code hooks?"
    log "──────────────────────────────────────────────────────────"
    log ""
    log "These hooks make /plan-tune settings actually bind at runtime:"
    log "  • PostToolUse hook captures every AskUserQuestion fire (no agent"
    log "    compliance required). Today it's agent-convention and the log"
    log "    is empty in dogfood."
    log "  • PreToolUse hook enforces 'never-ask' preferences via Claude Code's"
    log "    permissionDecision protocol. Today preferences are agent-honored"
    log "    convention; this makes them binding."
    log ""
    log "Diff preview (PostToolUse capture hook):"
    "$SETTINGS_HOOK" diff-event \
      --event PostToolUse \
      --matcher '(AskUserQuestion|mcp__.*__AskUserQuestion)' \
      --command "$PLAN_TUNE_LOG_HOOK" \
      --source plan-tune-cathedral \
      --timeout 5 2>/dev/null || true
    log ""
    log "Backup: settings.json.bak.<ts> written before any mutation."
    log "Rollback: $SETTINGS_HOOK rollback"
    log ""
    printf "Install both hooks now? [y/N] (default: N, auto-skips in %ss): " "$_PT_PROMPT_TIMEOUT"
    read -t "$_PT_PROMPT_TIMEOUT" -r PLAN_TUNE_INSTALL_REPLY </dev/tty 2>/dev/null || PLAN_TUNE_INSTALL_REPLY=""
    case "$PLAN_TUNE_INSTALL_REPLY" in
      y|Y)
        _install_plan_tune_hooks
        log ""
        log "Plan-tune hooks installed. Run /plan-tune anytime to inspect."
        touch "$PLAN_TUNE_INSTALL_MARKER"
        ;;
      n|N)
        log ""
        log "Skipped. Re-run ./setup --plan-tune-hooks or use /update-config to install later."
        touch "$PLAN_TUNE_INSTALL_MARKER"
        ;;
      *)
        # Empty / timed out — treat as "ask me again" (don't persist a decline).
        log ""
        log "No response — skipped for now. Re-run ./setup --plan-tune-hooks to install."
        ;;
    esac
  else
    # Non-interactive (CI, scripted/workspace setup, quiet). Never prompt.
    log ""
    log "Plan-tune cathedral hooks not installed (non-interactive setup)."
    log "Install with: ./setup --plan-tune-hooks"
    log "  (or set GSTACK_PLAN_TUNE_HOOKS=yes, or run the commands below)"
    log "  $SETTINGS_HOOK add-event --event PostToolUse \\"
    log "    --matcher '(AskUserQuestion|mcp__.*__AskUserQuestion)' \\"
    log "    --command $PLAN_TUNE_LOG_HOOK --source plan-tune-cathedral --timeout 5"
    log "  $SETTINGS_HOOK add-event --event PreToolUse \\"
    log "    --matcher '(AskUserQuestion|mcp__.*__AskUserQuestion)' \\"
    log "    --command $PLAN_TUNE_PREF_HOOK --source plan-tune-cathedral --timeout 5"
  fi
fi

# ─── Timeline Stop hook (#2553) ──────────────────────────────────────────────
# The preamble writes event:"started" to the project timeline at every skill
# start; the completion write lives in end-of-workflow prose and is
# unenforceable — interrupted sessions leaked started > completed forever.
# Register a Stop-event hook that closes dangling entries. FAIL-OPEN contract
# (F5): the hook always exits 0 and repairs best-effort — it can never block
# a session. Idempotent via the (event, source) dedup in gstack-settings-hook;
# removed by --no-team and gstack-uninstall.
TIMELINE_STOP_HOOK="$SOURCE_GSTACK_DIR/hosts/claude/hooks/timeline-stop-hook"
if [ "$NO_TEAM_MODE" -ne 1 ] && [ -x "$SETTINGS_HOOK" ] && [ -x "$TIMELINE_STOP_HOOK" ]; then
  if ! "$SETTINGS_HOOK" list-sources 2>/dev/null | grep -q "gstack-timeline-stop"; then
    if "$SETTINGS_HOOK" add-event \
      --event Stop \
      --command "$TIMELINE_STOP_HOOK" \
      --source gstack-timeline-stop \
      --timeout 5 >/dev/null 2>&1; then
      log "  registered Stop hook: session timeline entries now close even when a skill is interrupted (backup: settings.json.bak.<ts>; remove: $SETTINGS_HOOK remove-source --source gstack-timeline-stop)"
    fi
  fi
fi

# Also tear down plan-tune + timeline hooks on --no-team (matches the existing pattern).
if [ "$NO_TEAM_MODE" -eq 1 ] && [ -x "$SETTINGS_HOOK" ]; then
  "$SETTINGS_HOOK" remove-source --source plan-tune-cathedral 2>/dev/null || true
  "$SETTINGS_HOOK" remove-source --source gstack-timeline-stop 2>/dev/null || true
fi

# ─── Redact pre-push guard consent (#1946) ───────────────────────────────────
# The credential pre-push hook is per-REPO state — setup runs in the gstack
# checkout, the wrong repo to install it into, so setup NEVER installs the
# hook itself. /ship installs it silently in any repo where
# redact_prepush_hook=true. What setup owns is CONSENT: on a real interactive
# terminal it asks ONCE whether pushes should be scanned, recording the
# answer to the existing redact_prepush_hook key (default stays false — a
# timeout or non-interactive run changes nothing and keeps the hint-only
# posture). An explicit answer is persisted and never re-asked; an explicit
# "false" is a recorded decline (adversarial review finding 11).
# `gstack-config get` defaults absent keys to "false", which is
# indistinguishable from a decline — test key presence in the config file.
_GSTACK_CFG_FILE="${GSTACK_HOME:-$HOME/.gstack}/config.yaml"
if ! grep -q '^redact_prepush_hook:' "$_GSTACK_CFG_FILE" 2>/dev/null; then
  if [ "$QUIET" -ne 1 ] && [ -t 0 ] && [ -t 1 ]; then
    _REDACT_PROMPT_TIMEOUT=10
    log ""
    log "Credential push guard: gstack can block pushes containing credentials"
    log "(a per-repo git pre-push hook; /ship installs it automatically in every"
    log "repo you ship from — nothing is installed right now)."
    printf "Enable the pre-push credential guard? [y/N] (default: N, auto-skips in %ss): " "$_REDACT_PROMPT_TIMEOUT"
    read -t "$_REDACT_PROMPT_TIMEOUT" -r _REDACT_REPLY </dev/tty 2>/dev/null || _REDACT_REPLY=""
    case "$_REDACT_REPLY" in
      y|Y)
        "$GSTACK_CONFIG" set redact_prepush_hook true 2>/dev/null || true
        log "Enabled. /ship will install the guard in each repo at first push."
        ;;
      n|N)
        "$GSTACK_CONFIG" set redact_prepush_hook false 2>/dev/null || true
        log "Declined — recorded. Re-enable anytime: gstack-config set redact_prepush_hook true"
        ;;
      *)
        # Timed out / empty: don't persist a decline — hint and ask next time.
        log ""
        log "Skipped for now. Enable anytime: gstack-config set redact_prepush_hook true"
        ;;
    esac
  else
    log ""
    log "Tip: gstack can block pushes containing credentials (per-repo git hook)."
    log "     Enable once: gstack-config set redact_prepush_hook true — /ship"
    log "     installs the hook automatically in every repo you ship from."
  fi
fi