gstack/bin/gstack-config

#!/usr/bin/env bash
# gstack-config — read/write <state root>/config.yaml (default ~/.gstack/config.yaml)
#
# Usage:
#   gstack-config get <key>          — read a config value (falls back to DEFAULTS)
#   gstack-config has <key>          — exit 0 iff the key is literally present in the
#                                      config file (get returns DEFAULTS for absent keys,
#                                      so callers that need provenance use this instead)
#   gstack-config set <key> <value>  — write a config value
#   gstack-config unset <key>        — remove a key from the config file
#   gstack-config list               — show all config (values + defaults)
#   gstack-config defaults           — show just the defaults table
#
# State root: GSTACK_STATE_ROOT → GSTACK_HOME → GSTACK_STATE_DIR →
# CLAUDE_PLUGIN_DATA (only when CLAUDE_PLUGIN_ROOT contains "gstack") →
# ~/.gstack (bin/gstack-state-root.sh). Set GSTACK_HOME to relocate state;
# GSTACK_STATE_ROOT is gstack-paths' output, also honored as input;
# GSTACK_STATE_DIR is a legacy alias.
# Privacy keys (telemetry, memorable_recall, codex_reviews, update_check) take
# the most restrictive value across the resolved root and ~/.gstack; `set`
# reports which root received the value and which root still overrides it.
# Docs: https://github.com/garrytan/gstack/blob/main/docs/state-root.md
set -euo pipefail

. "$(dirname "$0")/gstack-state-root.sh" 2>/dev/null || { echo "$0: cannot resolve the gstack state root: $(dirname "$0")/gstack-state-root.sh is missing. fix: reinstall with ./setup or /gstack-upgrade (docs/state-root.md)" >&2; exit 1; }
gstack_state_root_select
STATE_DIR="$_gstack_sr_root"
CONFIG_FILE="$STATE_DIR/config.yaml"

# 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 setup'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"
}

# Annotated header for new config files. Written once on first `set`.
# Default semantics: DEFAULTS table below is the canonical source. Header text
# is documentation that must stay in sync with DEFAULTS.
CONFIG_HEADER='# gstack configuration — edit freely, changes take effect on next skill run.
# Docs: https://github.com/garrytan/gstack
#
# ─── Behavior ────────────────────────────────────────────────────────
# proactive: true           # Auto-invoke skills when your request matches one.
#                           # Set to false to only run skills you type explicitly.
#
# routing_declined: false   # Set to true to skip the CLAUDE.md routing injection
#                           # prompt. Set back to false to be asked again.
#
# ─── Telemetry ───────────────────────────────────────────────────────
# telemetry: off            # off | anonymous | community
#                           #   off       — no data sent, no local analytics (default)
#                           #   anonymous — counter only, no device ID
#                           #   community — usage data + stable device ID
#
# ─── Updates ─────────────────────────────────────────────────────────
# auto_upgrade: false       # true = silently upgrade on session start
# update_check: true        # false = suppress version check notifications
#
# ─── Skill naming ────────────────────────────────────────────────────
# skill_prefix: false       # true = namespace skills as /gstack-qa, /gstack-ship
#                           # false = short names /qa, /ship
# disabled_skills:          # comma-separated skills to leave unregistered,
#                           # e.g. make-pdf,pair-agent ("" = all enabled)
#
# ─── Writing style (V1) ──────────────────────────────────────────────
# explain_level: default    # default = jargon-glossed, outcome-framed prose
#                           #           (V1 default — more accessible for everyone)
#                           # terse   = V0 prose style, no glosses, no outcome-framing layer
#                           #           (for power users who know the terms)
#                           # Unknown values default to "default" with a warning.
#                           # See docs/designs/PLAN_TUNING_V1.md for rationale.
#
# ─── Artifacts sync (renamed from gbrain_sync_mode in v1.27.0.0) ─────
# artifacts_sync_mode: off  # off | artifacts-only | full
#                           #   off            — no sync (default)
#                           #   artifacts-only — sync plans/designs/retros/learnings only
#                           #                    (skip behavioral data: question-log,
#                           #                    developer-profile, timeline)
#                           #   full           — sync everything allowlisted
#                           # Set by the first-run privacy stop-gate. See docs/gbrain-sync.md.
#
# artifacts_sync_mode_prompted: false
#                           # Set to true once the privacy gate has asked the user.
#                           # Flip back to false to be re-prompted.
#
# artifacts_sync_removals: off  # on | off — on: each sync also publishes the
#                           #   removal of synced files gone from disk; more than
#                           #   20 at once is held for gstack-brain-sync
#                           #   --publish-removals. See docs/gbrain-sync.md.
#
# ─── Transcript ingest (gbrain memory) ───────────────────────────────
# transcript_ingest_mode: off  # recent | all | off | new@<UTC> — consent for
#                           #   /sync-gbrain to ingest Claude Code and Codex
#                           #   session transcripts (every project repo policy
#                           #   allows) into your brain (local or Supabase).
#                           #   recent — last 90 days
#                           #   all    — all history
#                           #   new@2026-10-03T17:00:00Z — only sessions that
#                           #            start after that UTC time
#                           #   off    — never (other memory still syncs)
#                           # A +repos suffix is kept automatically while
#                           # transcript_repos is set.
#                           # Absent, legacy (A-E, incremental) or unknown
#                           # values are not consent: transcripts are skipped
#                           # and /sync-gbrain asks once. An invalid value is
#                           # REJECTED and the stored value kept.
# transcript_repos:         # comma-separated git remotes; only transcripts
#                           #   from these repos are ingested. Clear it with
#                           #   `gstack-config unset transcript_repos`.
#                           # Docs: setup-gbrain/memory.md#transcripts
#
# ─── Timeline Stop hook ──────────────────────────────────────────────
# timeline_stop_hook: yes   # Controls whether ./setup registers the timeline
#                           #   Stop hook (closes dangling session entries).
#                           #   yes — register on every setup (default)
#                           #   no  — never register; setup also removes a
#                           #         live registration (persistent opt-out;
#                           #         --no-team stays a one-shot teardown, #2677)
#
# ─── Plan-tune hooks ─────────────────────────────────────────────────
# plan_tune_hooks: prompt   # Controls whether ./setup installs the plan-tune
#                           #   Claude Code hooks (PostToolUse capture +
#                           #   PreToolUse preference enforcement).
#                           #   prompt — ask on a real TTY, skip otherwise (default)
#                           #   yes    — install non-interactively
#                           #   no     — skip non-interactively
#                           # Override per-run: ./setup --plan-tune-hooks /
#                           #   --no-plan-tune-hooks, or env GSTACK_PLAN_TUNE_HOOKS.
#
# ─── Memorable recall bridge (opt-in, third party) ──────────────────
# memorable_recall: off     # The gstack-side consent gate for the Memorable
#                           #   UserPromptSubmit bridge (bin/gstack-memorable).
#                           #   off — the hook does nothing, spawns nothing (default)
#                           #   on  — the hook hands each prompt to the local
#                           #         `memorable` CLI, receipted as memorable-recall
#                           # Written by `gstack-memorable enable|disable`. An
#                           # invalid value is REJECTED and the stored value kept:
#                           # a typo must never flip a third-party consent.
#                           # The vendor capture consent (`memorable enable`)
#                           # is separate; gstack never sets it.
#
# ─── Claude skill overlay ────────────────────────────────────────────
# claude_overlay_model: claude  # Claude model ID whose skill overlay ./setup
#                           #   renders (e.g. claude-opus-4-8). Absent = the
#                           #   generic claude overlay. Set it with
#                           #   ./setup --claude-model <id>, which validates the
#                           #   ID and re-renders; ./setup --claude-model claude
#                           #   returns to the generic overlay.
#
# ─── Model policy (gstack-models shows the effective choices) ───────
# Plan review tier: frontier | smart | host. host delegates to the CLI settings;
# GSTACK_CLAUDE_MODEL / GSTACK_CODEX_MODEL still win.
# plan_review_tier: frontier
# Implementation recommendation: frontier | smart. Never switches your session.
# implementation_tier: smart
# Optional pins: model_frontier_claude, model_frontier_openai,
# model_smart_claude and model_smart_openai. Leave pins absent for catalog defaults;
# empty pins are invalid. gstack-models list prints copyable set/unset commands.
# Invalid writes are rejected and preserve the stored value.
# Docs: docs/model-policy.md
#
# ─── Advanced ────────────────────────────────────────────────────────
# codex_reviews: enabled    # Workflow outside review (Codex or Claude Code by harness).
#                           #   enabled: /review, /ship, /document-release, plan reviews,
#                           #   and /autoplan use their existing external + fallback rules.
#                           #   disabled: /review, /ship, /autoplan keep native passes;
#                           #   plan/document reviews skip the entire extra review step.
#                           #   Office hours/design/spec/manual wrappers keep their own
#                           #   opt-in/skip controls. Invalid values preserve the old value.
# browse_extension_id:      # Forks and self-built extensions: the 32-letter (a-p)
#                           #   Chrome extension ID the browse sidebar terminal accepts.
#                           #   Empty = the gstack extension. "" clears it.
# design_detector_install_prompted: false
#                           #   true once you answered the one-time offer from the
#                           #   design skills to download the impeccable engine with
#                           #   "never ask again"; flip back to false to be asked again.
# design_detector: auto     # Deterministic design pre-pass through a user-installed
#                           #   impeccable engine (/design-review, /review, /ship,
#                           #   /design-html). auto = use the engine when the probe
#                           #   finds one (gstack never installs or downloads it);
#                           #   off = no probe, no scan, no hint, no /impeccable
#                           #   handoff lines. An invalid value is REJECTED (existing
#                           #   value preserved) so a typo cannot silently disable it.
# gstack_contributor: false # true = file field reports when gstack misbehaves
# skip_eng_review: false    # true = skip eng review gate in /ship (not recommended)
#
# ─── Browser extension ───────────────────────────────────────────────
# browse_extension_id:      # Chrome extension ID the browse daemon trusts for
#                           #   /extension-token and the terminal-agent /ws
#                           #   (32 letters a-p). Empty = the published gstack
#                           #   extension. Set it only for a fork or a
#                           #   self-built extension; no environment variable
#                           #   or project .env can change it. An invalid value
#                           #   is REJECTED and the stored value kept.
#
# ─── /ship measure-then-fix loop ─────────────────────────────────────
# A red eval case is measured alone before the full gate reruns
# (scripts/ship-measure.ts; docs/TESTING_INTERNALS.md#ship-measure).
# Bar (scripts/lib/measure-bar.ts): MEETS at 9/10 of the trials, MEETS-qualified
# at 8/10 with every red qualifying, EXTEND at 7/10 (one more batch, pooled).
# ship_measure_rule_trials: 10        # rule cases: trials per batch (MEETS 9 of 10)
# ship_measure_behavior_panels: 4     # behavior cases: panels of 3 per batch
#                           #   (12 trials; MEETS 11 of 12)
# ship_measure_judge_outputs: 10      # judge cases: outputs per batch, each scored
#                           #   by its median 3-sample panel (MEETS 9 of 10)
# ship_measure_ask_per_trial_usd: 2   # ask first above this estimated cost per trial
# ship_measure_budget_usd: 25         # estimated admission budget per red case
#                           #   (baseline, extension, redispatch, repair rounds)
# ship_measure_max_rounds: 3          # repair rounds before a named-red stop
# ship_measure_sweep_cases: 5         # weekly off-ship sweep: cases measured (K)
# ship_measure_sweep_budget_usd: 150  # weekly off-ship sweep: spend cap per 7 days
# ship_rerun_backend: local # local | ubicloud — where free-suite flake reruns
#                           #   run; ubicloud also needs UBICLOUD_API_KEY.
#                           #   Invalid values are REJECTED (value kept).
# ship_greptile_early: true # true | false — when the repo uses Greptile, /ship
#                           #   pushes and opens a draft PR after its free tests
#                           #   so Greptile reviews in parallel (a public repo
#                           #   asks once). false keeps the old order.
#                           #   Invalid values are REJECTED (value kept).
#
# ─── Workspace-aware ship ────────────────────────────────────────────
# workspace_root: $HOME/conductor/workspaces  # Where /ship looks for sibling
#                           # Conductor worktrees when picking a VERSION slot.
#                           # Set to "null" to disable sibling scanning entirely.
#                           # Non-Conductor users can point this at any directory
#                           # that holds parallel worktrees of the same repo.
#
'

# DEFAULTS table — canonical default values for known keys.
# `get <key>` returns DEFAULTS[key] when the key is absent from the config file
# AND the env override is not set. Keep in sync with the CONFIG_HEADER comments.
lookup_default() {
  case "$1" in
    proactive) echo "true" ;;
    routing_declined) echo "false" ;;
    telemetry) echo "off" ;;
    auto_upgrade) echo "false" ;;
    update_check) echo "true" ;;
    skill_prefix) echo "false" ;;
    explain_level) echo "default" ;;
    codex_reviews) echo "enabled" ;;
    design_detector) echo "auto" ;; # auto | off — impeccable engine pre-pass in the design skills
    design_detector_install_prompted) echo "false" ;; # true once the user answered the one-time engine install offer with "never ask again"
    gstack_contributor) echo "false" ;;
    skip_eng_review) echo "false" ;;
    workspace_root) echo "$HOME/conductor/workspaces" ;;
    cross_project_learnings) echo "" ;; # intentionally empty → unset triggers first-time prompt
    artifacts_sync_mode) echo "off" ;;
    artifacts_sync_mode_prompted) echo "false" ;;
    artifacts_sync_removals) echo "off" ;; # on | off — publish removals of synced files gone from disk
    plan_tune_hooks) echo "prompt" ;; # prompt | yes | no — controls ./setup plan-tune hook install
    timeline_stop_hook) echo "yes" ;; # yes | no — controls ./setup timeline Stop hook registration (#2677)

    redact_repo_visibility) echo "" ;; # empty → fall through to gh/glab detection
    redact_prepush_hook) echo "false" ;;
    pair_agent) echo "off" ;; # remote tunnel consent — fail-closed until /pair-agent asks
    memorable_recall) echo "off" ;; # on | off — Memorable bridge gate, fail-closed until `gstack-memorable enable`
    founder_resources) echo "true" ;; # office-hours resource pitch — #538 permanent opt-out sets false
    browse_extension_id) echo "" ;; # empty → browse trusts gstack's own extension ID (D1)
    claude_overlay_model) echo "claude" ;; # set only by ./setup --claude-model; presence via `has`
    # Brain-aware planning (v1.48 / T5+T10+T16). Defaults documented inline:
    #   brain_trust_policy@<endpoint-id>  — unset on fresh install; setup-gbrain
    #                                writes 'personal' for local engines,
    #                                asks the user for remote-ambiguous.
    #   salience_allowlist          — empty falls through to
    #                                SALIENCE_DEFAULT_ALLOWLIST (D9).
    #   user_slug_at_<endpoint-id>  — empty triggers resolve-user-slug
    #                                fallback chain (D4 A3) on first call.
    brain_trust_policy*) echo "unset" ;;
    salience_allowlist) echo "" ;;
    user_slug_at_*) echo "" ;;
    # Read by skill preambles but missing from this table, so they fell through
    # to the catch-all and came back "" with exit 0. Values below are the ones
    # the callers already assume in their own `|| echo "<default>"` fallback.
    question_tuning) echo "false" ;;
    team_mode) echo "false" ;;
    transcript_ingest_mode) echo "off" ;; # recent | all | off | new@<UTC> [+repos] — transcript consent; absent = not consented (use `has`)
    transcript_repos) echo "" ;; # empty = every repo; comma-separated canonical remotes narrow transcript ingest
    # repo_mode: EMPTY is load-bearing — gstack-repo-mode treats any non-empty
    # answer as a user override and skips its own classification entirely, so
    # a synthesized "unknown" default turns the classifier into dead code.
    # Empty + exit 0 = "no override set, go classify".
    repo_mode) echo "" ;;
    # /ship measure-then-fix loop (scripts/ship-measure.ts reads these).
    ship_measure_rule_trials) echo "10" ;;
    ship_measure_behavior_panels) echo "4" ;;
    ship_measure_judge_outputs) echo "10" ;;
    ship_measure_ask_per_trial_usd) echo "2" ;;
    ship_measure_budget_usd) echo "25" ;;
    ship_measure_max_rounds) echo "3" ;;
    ship_measure_sweep_cases) echo "5" ;;
    ship_measure_sweep_budget_usd) echo "150" ;;
    ship_rerun_backend) echo "local" ;; # local | ubicloud (Ubicloud spend is opt-in)
    plan_review_tier) echo "frontier" ;; # frontier | smart | host — lib/model-policy.ts reads it strictly
    implementation_tier) echo "smart" ;; # frontier | smart
    model_frontier_claude|model_frontier_openai|model_smart_claude|model_smart_openai) echo "" ;; # empty = shipped catalog ID (gstack-models list)
    ship_greptile_early) echo "true" ;; # true | false — /ship's early Greptile PR
    # Unknown key: exit non-zero instead of printing "". The fallback pattern
    # the preambles use,
    #   VAR=$(gstack-config get <key> 2>/dev/null || echo "<default>")
    # only fires on a non-zero exit, so a catch-all echoing "" with exit 0 left
    # VAR empty and the written default unreachable.
    # Deliberately *only* the unknown-key path: the keys above whose default is
    # intentionally empty (cross_project_learnings, salience_allowlist,
    # user_slug_at_*, redact_repo_visibility) keep exit 0, because "" is their
    # real answer and their callers rely on it.
    *) return 1 ;;
  esac
}

# ──────────────────────────────────────────────────────────────────────
# Brain-integration helpers (T5+T10+T16)
# ──────────────────────────────────────────────────────────────────────

# Compute sha8 of a string. Used for endpoint hashing.
# shasum is macOS/perl; most Linux distros ship only coreutils sha256sum —
# resolve whichever exists (same fallback chain as the codex-probe timeout
# wrapper). Without this, any Linux user with a git email hit exit 127 in
# resolve-user-slug's Layer-3 fallback.
sha8_of() {
  if command -v sha256sum >/dev/null 2>&1; then
    printf '%s' "$1" | sha256sum | cut -c1-8
  else
    printf '%s' "$1" | shasum -a 256 | cut -c1-8
  fi
}

# Detect the active brain endpoint hash. Reads ~/.claude.json for the gbrain
# MCP server URL. Falls back to the literal 'local' when no MCP is configured.
endpoint_hash() {
  _claude_json="$HOME/.claude.json"
  if [ -f "$_claude_json" ] && command -v jq >/dev/null 2>&1; then
    _url=$(jq -r '.mcpServers.gbrain.url // .mcpServers.gbrain.transport.url // empty' "$_claude_json" 2>/dev/null)
    if [ -n "$_url" ] && [ "$_url" != "null" ]; then
      sha8_of "$_url"
      return 0
    fi
  fi
  printf '%s' "local"
}

# Detect endpoint hash collisions. When two distinct endpoints share the same
# sha8 prefix (rare but possible), escalate to sha16 by emitting the longer
# hash. Detection: scan config file for existing brain_trust_policy@<hash> or
# user_slug_at_<hash> keys; if any non-active hash equals the active sha8 but
# would differ at sha16, the active endpoint needs sha16.
endpoint_hash_with_collision_check() {
  _active=$(endpoint_hash)
  if [ "$_active" = "local" ]; then
    printf '%s' "$_active"
    return 0
  fi
  # If a different endpoint (different URL) shares this sha8, escalate.
  # We only catch this when the config has another endpoint recorded.
  _matching=$(grep -E "^(brain_trust_policy|user_slug_at)@${_active}" "$CONFIG_FILE" 2>/dev/null | head -1 || true)
  _claude_json="$HOME/.claude.json"
  if [ -n "$_matching" ] && [ -f "$_claude_json" ] && command -v jq >/dev/null 2>&1; then
    _url=$(jq -r '.mcpServers.gbrain.url // .mcpServers.gbrain.transport.url // empty' "$_claude_json" 2>/dev/null)
    if command -v sha256sum >/dev/null 2>&1; then
      _sha16=$(printf '%s' "$_url" | sha256sum | cut -c1-16)
    else
      _sha16=$(printf '%s' "$_url" | shasum -a 256 | cut -c1-16)
    fi
    # Look for any sha16-namespaced key that conflicts. If a stored sha16 exists
    # and differs from current sha16, that's the collision evidence; emit sha16.
    _stored16=$(grep -E "^(brain_trust_policy|user_slug_at)@${_sha16}" "$CONFIG_FILE" 2>/dev/null | head -1 || true)
    if [ -n "$_stored16" ]; then
      printf '%s' "$_sha16"
      return 0
    fi
  fi
  printf '%s' "$_active"
}

# Resolve the user-slug per D4 A3 chain:
#   1. mcp__gbrain__whoami.client_name (best effort via gbrain CLI shell-out)
#   2. $USER env
#   3. sha8($(git config user.email))
#   4. anonymous-<sha8(hostname)>
# Persists result via gstack-config set user_slug_at_<endpoint-hash> on first call.
resolve_user_slug() {
  _hash=$(endpoint_hash_with_collision_check)
  _stored=$(grep -E "^user_slug_at_${_hash}:" "$CONFIG_FILE" 2>/dev/null | tail -1 | awk '{print $2}' | tr -d '[:space:]' || true)
  if [ -n "$_stored" ]; then
    printf '%s' "$_stored"
    return 0
  fi

  _slug=""

  # Layer 1: gbrain whoami
  if command -v gbrain >/dev/null 2>&1; then
    _whoami=$(gbrain whoami --json 2>/dev/null || true)
    if [ -n "$_whoami" ] && command -v jq >/dev/null 2>&1; then
      _client_name=$(printf '%s' "$_whoami" | jq -r '.client_name // .token_name // empty' 2>/dev/null || true)
      if [ -n "$_client_name" ] && [ "$_client_name" != "null" ]; then
        _slug=$(printf '%s' "$_client_name" | tr '[:upper:] ' '[:lower:]-' | tr -dc '[:alnum:]-')
      fi
    fi
  fi

  # Layer 2: $USER
  if [ -z "$_slug" ] && [ -n "${USER:-}" ]; then
    _slug=$(printf '%s' "$USER" | tr '[:upper:] ' '[:lower:]-' | tr -dc '[:alnum:]-')
  fi

  # Layer 3: sha8 of git email
  if [ -z "$_slug" ]; then
    _email=$(git config user.email 2>/dev/null || true)
    if [ -n "$_email" ]; then
      _slug="email-$(sha8_of "$_email")"
    fi
  fi

  # Layer 4: anonymous-<sha8(hostname)>
  if [ -z "$_slug" ]; then
    _slug="anonymous-$(sha8_of "$(hostname 2>/dev/null || echo unknown)")"
  fi

  # Persist via the locked read-modify-write (no recursion into `set`).
  config_lock
  config_edit_begin
  if [ -z "$(_cfg_get "user_slug_at_${_hash}")" ]; then
    _cfg_put "user_slug_at_${_hash}" "$_slug"
    config_edit_commit
  else
    rm -f "$_cfg_tmp"
  fi
  config_unlock

  printf '%s' "$_slug"
}

# The one reader (bin/gstack-state-root.sh): last `key:` line in the resolved
# root, except privacy keys, which take the most restrictive value across roots.
read_config_value() {
  gstack_read_config_key "$1"
}

# ── Config writes: one lock, one read-modify-write rename ──────────────────
# Every mutation of config.yaml (set, unset, the transcript_repos pair, the
# user-slug writer) holds an atomic mkdir lock and replaces the file with one
# rename, so concurrent writers never lose each other's keys and an
# interrupted write leaves the old file. The pid file holds "<pid> <epoch>";
# a lock whose holder is dead or older than 10 s is taken over. No flock(1):
# stock macOS does not ship it.
CONFIG_LOCK="$STATE_DIR/.config-yaml.lock"
_config_locked=""

config_lock() {
  mkdir -p "$STATE_DIR"
  local waited=0 held pid ts stale
  while ! mkdir "$CONFIG_LOCK" 2>/dev/null; do
    if [ ! -w "$STATE_DIR" ]; then
      echo "Error: cannot write to $STATE_DIR (its config lock could not be created). Existing value left unchanged." >&2
      exit 1
    fi
    waited=$(( waited + 1 ))
    if [ "$waited" -gt 400 ]; then
      echo "Error: $CONFIG_FILE is locked by another gstack-config ($(cat "$CONFIG_LOCK/pid" 2>/dev/null || echo 'unknown holder')). Existing value left unchanged. fix: retry, or remove $CONFIG_LOCK if no gstack-config is running." >&2
      exit 1
    fi
    held=$(cat "$CONFIG_LOCK/pid" 2>/dev/null || true)
    pid=""; ts=""; stale=""
    case "$held" in *" "*) pid="${held%% *}"; ts="${held#* }"; ts="${ts%%[!0-9]*}" ;; esac
    if [ -n "$pid" ]; then
      if ! kill -0 "$pid" 2>/dev/null; then stale=1
      elif [ -n "$ts" ] && [ $(( $(date +%s) - ts )) -gt 10 ]; then stale=1; fi
    elif [ "$waited" -gt 200 ]; then
      stale=1
    fi
    # Take over only the lock we judged: a holder that changed meanwhile is live.
    if [ -n "$stale" ] && [ "$(cat "$CONFIG_LOCK/pid" 2>/dev/null || true)" = "$held" ]; then
      rm -rf "$CONFIG_LOCK" 2>/dev/null || true
      continue
    fi
    sleep 0.05
  done
  printf '%s %s\n' "$$" "$(date +%s)" > "$CONFIG_LOCK/pid"
  _config_locked=1
  trap 'config_unlock' EXIT
}

config_unlock() {
  [ -n "$_config_locked" ] || return 0
  rm -rf "$CONFIG_LOCK" 2>/dev/null || true
  _config_locked=""
}

# config_edit_begin — copy config.yaml (or the annotated header for a new
# file) to a temp file beside it; edits go there until config_edit_commit.
config_edit_begin() {
  _cfg_tmp="$(mktemp "$STATE_DIR/.config.yaml.XXXXXX")"
  if [ -f "$CONFIG_FILE" ]; then cat "$CONFIG_FILE" > "$_cfg_tmp"; else printf '%s' "$CONFIG_HEADER" > "$_cfg_tmp"; fi
}

config_edit_commit() {
  mv "$_cfg_tmp" "$CONFIG_FILE"
}

# _cfg_get KEY — last value of KEY in the temp file ("" when absent).
_cfg_get() {
  awk -v k="$1" 'BEGIN { n = length(k) + 1 } substr($0, 1, n) == k ":" { v = substr($0, n + 1) } END { sub(/^[ \t]+/, "", v); sub(/[ \t\r]+$/, "", v); print v }' "$_cfg_tmp"
}

# _cfg_put KEY VALUE — replace every KEY line in the temp file, or append one.
# The value travels through ENVIRON so awk applies no escape processing.
_cfg_put() {
  _CFG_V="$2" awk -v k="$1" 'BEGIN { n = length(k) + 1; v = ENVIRON["_CFG_V"] } substr($0, 1, n) == k ":" { print k ": " v; done = 1; next } { print } END { if (!done) print k ": " v }' "$_cfg_tmp" > "$_cfg_tmp.n"
  mv "$_cfg_tmp.n" "$_cfg_tmp"
}

_cfg_del() {
  awk -v k="$1" 'BEGIN { n = length(k) + 1 } substr($0, 1, n) != k ":"' "$_cfg_tmp" > "$_cfg_tmp.n"
  mv "$_cfg_tmp.n" "$_cfg_tmp"
}

# ── Transcript consent grammar ─────────────────────────────────────────────
# transcript_ingest_mode = <base>[@<YYYY-MM-DDTHH:MM:SSZ>][+repos]; base is
# recent, all, off or new. `@` is required for new and invalid otherwise; off
# never carries +repos. `set` takes the canonical lowercase form (readers in
# lib/transcript-consent.ts are case-insensitive).
valid_utc_second() {
  [[ "$1" =~ ^([0-9]{4})-([0-9]{2})-([0-9]{2})T([0-9]{2}):([0-9]{2}):([0-9]{2})Z$ ]] || return 1
  local y=$((10#${BASH_REMATCH[1]})) m=$((10#${BASH_REMATCH[2]})) d=$((10#${BASH_REMATCH[3]}))
  local hh=$((10#${BASH_REMATCH[4]})) mm=$((10#${BASH_REMATCH[5]})) ss=$((10#${BASH_REMATCH[6]})) dim=31
  [ "$m" -ge 1 ] && [ "$m" -le 12 ] && [ "$hh" -le 23 ] && [ "$mm" -le 59 ] && [ "$ss" -le 59 ] || return 1
  case "$m" in
    4|6|9|11) dim=30 ;;
    2) dim=28; if [ $((y % 4)) -eq 0 ] && { [ $((y % 100)) -ne 0 ] || [ $((y % 400)) -eq 0 ]; }; then dim=29; fi ;;
  esac
  [ "$d" -ge 1 ] && [ "$d" -le "$dim" ]
}

# valid_transcript_mode VALUE — canonical grammar check (exit 0 = valid).
valid_transcript_mode() {
  local v="$1" base
  base="${v%+repos}"
  case "$base" in
    recent|all) ;;
    off) [ "$base" = "$v" ] || return 1 ;;
    new@*) valid_utc_second "${base#new@}" || return 1 ;;
    *) return 1 ;;
  esac
}

# canonical_remote URL — same rules as canonicalizeRemote in
# lib/gstack-memory-helpers.ts (test/transcript-consent.test.ts keeps them equal).
canonical_remote() {
  local s="$1"
  s="${s#"${s%%[![:space:]]*}"}"; s="${s%"${s##*[![:space:]]}"}"
  s="${s#[\"\']}"; s="${s%[\"\']}"
  if [[ "$s" =~ ^[^@[:space:]]+@([^:]+):(.+)$ ]]; then
    s="${BASH_REMATCH[1]}/${BASH_REMATCH[2]}"
  else
    s=$(printf '%s' "$s" | sed -E 's#^[a-zA-Z][a-zA-Z0-9+.-]*://##; s#^[^@/]+@##')
  fi
  printf '%s' "$s" | sed -E 's#/+$##; s#\.[gG][iI][tT]$##; s#/+$##; s#/{2,}#/#g' | tr '[:upper:]' '[:lower:]'
}

# transcript_marker_sync — keep the +repos marker on transcript_ingest_mode in
# step with transcript_repos inside the temp file: present while an allowlist
# exists and the base consents, absent otherwise. Unrecognized values are
# left untouched (they are not consent either way).
transcript_marker_sync() {
  local mode list base
  mode=$(_cfg_get transcript_ingest_mode)
  [ -n "$mode" ] || return 0
  valid_transcript_mode "$mode" || return 0
  list=$(_cfg_get transcript_repos)
  base="${mode%+repos}"
  if [ -n "$list" ] && [ "$base" != "off" ]; then _cfg_put transcript_ingest_mode "$base+repos"
  else _cfg_put transcript_ingest_mode "$base"; fi
}

_STATE_DOC="https://github.com/garrytan/gstack/blob/main/docs/state-root.md"
_SELF="$(cd "$(dirname "$0")" && pwd)/gstack-config"

# One line when the root-selecting variables name different directories.
report_root_disagreement() {
  local _v _val _set="" _distinct=""
  for _v in GSTACK_STATE_ROOT GSTACK_HOME GSTACK_STATE_DIR; do
    eval "_val=\${$_v:-}"
    [ -n "$_val" ] || continue
    _set="$_set $_v=$_val"
    case " $_distinct " in *" $_val "*) ;; *) _distinct="$_distinct $_val" ;; esac
  done
  set -- $_distinct
  [ "$#" -gt 1 ] || return 0
  echo "# note: root-selecting variables disagree:$_set; using $STATE_DIR ($_gstack_sr_var wins). Explain: $(dirname "$_SELF")/gstack-paths --explain ($_STATE_DOC)"
}

case "${1:-}" in
  get)
    KEY="${2:?Usage: gstack-config get <key>}"
    # Validate key (alphanumeric + underscore + optional @<endpoint-id> suffix for
    # endpoint-namespaced keys introduced by the brain-aware planning layer).
    # Endpoint ids are sha8/sha16 hex for remote MCP URLs, or the literal
    # "local" for stdio/PGLite engines (see endpoint_hash).
    if ! printf '%s' "$KEY" | LC_ALL=C grep -qE '^[a-zA-Z0-9_]+(@[a-zA-Z0-9]+)?$'; then
      echo "Error: key must contain only alphanumeric characters, underscores, and an optional @<endpoint-id> suffix" >&2
      exit 1
    fi
    VALUE=$(read_config_value "$KEY" || true)
    if [ -z "$VALUE" ]; then
      # lookup_default exits non-zero for a key it does not know. Propagate
      # that, so the caller's `|| echo "<default>"` can fire. A known key whose
      # default is empty still exits 0 and prints "".
      if ! VALUE=$(lookup_default "$KEY"); then
        exit 1
      fi
    fi
    printf '%s' "$VALUE"
    ;;
  has)
    KEY="${2:?Usage: gstack-config has <key>}"
    if ! printf '%s' "$KEY" | LC_ALL=C grep -qE '^[a-zA-Z0-9_]+(@[a-zA-Z0-9]+)?$'; then
      echo "Error: key must contain only alphanumeric characters, underscores, and an optional @<endpoint-id> suffix" >&2
      exit 1
    fi
    grep -qE "^${KEY}:" "$CONFIG_FILE" 2>/dev/null
    ;;
  set)
    KEY="${2:?Usage: gstack-config set <key> <value>}"
    if [ "$#" -lt 3 ]; then
      echo "Usage: gstack-config set <key> <value>" >&2
      exit 1
    fi
    VALUE="$3"
    # A config value is one non-empty line (disabled_skills may be empty: it
    # clears the list). Reject rather than truncate, so a bad value never
    # replaces the stored one.
    if [ -z "$VALUE" ] && [ "$KEY" != "disabled_skills" ] && [ "$KEY" != "browse_extension_id" ]; then
      echo "Error: $KEY value is empty. Existing value left unchanged." >&2
      exit 1
    fi
    case "$VALUE" in
      *$'\n'*)
        echo "Error: $KEY value contains a newline. Existing value left unchanged." >&2
        exit 1
        ;;
    esac
    # Validate key (alphanumeric + underscore + optional @<endpoint-id> suffix).
    # Accepts hex hashes and the literal "local" from endpoint_hash.
    if ! printf '%s' "$KEY" | LC_ALL=C grep -qE '^[a-zA-Z0-9_]+(@[a-zA-Z0-9]+)?$'; then
      echo "Error: key must contain only alphanumeric characters, underscores, and an optional @<endpoint-id> suffix" >&2
      exit 1
    fi
    # Validate brain_trust_policy value domain (D4 / D11)
    if printf '%s' "$KEY" | grep -qE '^brain_trust_policy(@|$)' && \
       [ "$VALUE" != "personal" ] && [ "$VALUE" != "shared" ] && [ "$VALUE" != "unset" ]; then
      echo "Warning: brain_trust_policy '$VALUE' not recognized. Valid values: personal, shared, unset. Using unset." >&2
      VALUE="unset"
    fi
    # V1: whitelist values for keys with closed value domains. Unknown values warn + default.
    if [ "$KEY" = "explain_level" ] && [ "$VALUE" != "default" ] && [ "$VALUE" != "terse" ]; then
      echo "Warning: explain_level '$VALUE' not recognized. Valid values: default, terse. Using default." >&2
      VALUE="default"
    fi
    if [ "$KEY" = "artifacts_sync_mode" ] && [ "$VALUE" != "off" ] && [ "$VALUE" != "artifacts-only" ] && [ "$VALUE" != "full" ]; then
      echo "Warning: artifacts_sync_mode '$VALUE' not recognized. Valid values: off, artifacts-only, full. Using off." >&2
      VALUE="off"
    fi
    if [ "$KEY" = "artifacts_sync_removals" ] && [ "$VALUE" != "on" ] && [ "$VALUE" != "off" ]; then
      echo "Warning: artifacts_sync_removals '$VALUE' not recognized. Valid values: on, off. Using off." >&2
      VALUE="off"
    fi
    # redact_repo_visibility: a LOCAL override for repos gh/glab can't read (e.g.
    # self-hosted GitLab). It lives in ~/.gstack/config.yaml (never committed), so
    # it can't be used to weaken the gate repo-wide for other contributors.
    if [ "$KEY" = "redact_repo_visibility" ] && [ "$VALUE" != "public" ] && [ "$VALUE" != "private" ] && [ "$VALUE" != "unknown" ]; then
      echo "Warning: redact_repo_visibility '$VALUE' not recognized. Valid values: public, private, unknown. Using unknown." >&2
      VALUE="unknown"
    fi
    if [ "$KEY" = "redact_prepush_hook" ] && [ "$VALUE" != "true" ] && [ "$VALUE" != "false" ]; then
      echo "Warning: redact_prepush_hook '$VALUE' not recognized. Valid values: true, false. Using false." >&2
      VALUE="false"
    fi
    if [ "$KEY" = "pair_agent" ] && [ "$VALUE" != "on" ] && [ "$VALUE" != "off" ]; then
      echo "Warning: pair_agent '$VALUE' not recognized. Valid values: on, off. Using off." >&2
      VALUE="off"
    fi
    if [ "$KEY" = "founder_resources" ] && [ "$VALUE" != "true" ] && [ "$VALUE" != "false" ]; then
      echo "Warning: founder_resources '$VALUE' not recognized. Valid values: true, false. Using true." >&2
      VALUE="true"
    fi
    if [ "$KEY" = "plan_tune_hooks" ] && [ "$VALUE" != "prompt" ] && [ "$VALUE" != "yes" ] && [ "$VALUE" != "no" ]; then
      echo "Warning: plan_tune_hooks '$VALUE' not recognized. Valid values: prompt, yes, no. Using prompt." >&2
      VALUE="prompt"
    fi
    if [ "$KEY" = "timeline_stop_hook" ] && [ "$VALUE" != "yes" ] && [ "$VALUE" != "no" ]; then
      echo "Warning: timeline_stop_hook '$VALUE' not recognized. Valid values: yes, no. Using yes." >&2
      VALUE="yes"
    fi
    # codex_reviews controls workflow outside CLI calls. Unlike the warn-and-default keys above,
    # an invalid value is REJECTED and the existing setting is left unchanged — a typo
    # must never silently flip the switch and turn paid Codex calls on or off.
    if [ "$KEY" = "codex_reviews" ] && [ "$VALUE" != "enabled" ] && [ "$VALUE" != "disabled" ]; then
      echo "Error: codex_reviews '$VALUE' not recognized. Valid values: enabled, disabled. Existing value left unchanged." >&2
      exit 1
    fi
    case "$KEY" in
      plan_review_tier|implementation_tier|model_frontier_claude|model_frontier_openai|model_smart_claude|model_smart_openai)
        _mp_doc="https://github.com/garrytan/gstack/blob/main/docs/troubleshooting.md#model-policy-config"
        VALUE="${VALUE#"${VALUE%%[![:space:]]*}"}"
        VALUE="${VALUE%"${VALUE##*[![:space:]]}"}"
        _mp_valid=1
        case "$KEY" in
          plan_review_tier) case "$VALUE" in frontier|smart|host) ;; *) _mp_valid="" ; _mp_rule="Valid values: frontier, smart, host." ;; esac ;;
          implementation_tier) case "$VALUE" in frontier|smart) ;; *) _mp_valid="" ; _mp_rule="Valid values: frontier, smart." ;; esac ;;
          *_claude) { [ "${#VALUE}" -le 512 ] && printf '%s' "$VALUE" | LC_ALL=C grep -qE '^[][A-Za-z0-9._:/@+-]+$'; } || { _mp_valid=""; _mp_rule="An Anthropic model ID is 1-512 characters from A-Z a-z 0-9 . _ : / @ + [ ] -."; } ;;
          *_openai) printf '%s' "$VALUE" | LC_ALL=C grep -qE '^[A-Za-z0-9._:/-]{1,100}$' || { _mp_valid=""; _mp_rule="An OpenAI model ID is 1-100 characters from A-Z a-z 0-9 . _ : / -."; } ;;
        esac
        if [ -z "$VALUE" ]; then
          echo "Error: $KEY value is empty. Existing value left unchanged. fix: gstack-config unset $KEY restores the default ($_mp_doc)" >&2
          exit 1
        fi
        if [ -z "$_mp_valid" ]; then
          echo "Error: $KEY '$VALUE' not recognized. $_mp_rule Existing value left unchanged. fix: gstack-config unset $KEY restores the default ($_mp_doc)" >&2
          exit 1
        fi ;;
    esac
    # The measure-loop controls bound paid spend: reject a typo instead of
    # coercing it, so a bad value never changes how much /ship may spend.
    case "$KEY" in
      ship_measure_rule_trials|ship_measure_behavior_panels|ship_measure_judge_outputs|ship_measure_max_rounds|ship_measure_sweep_cases)
        if ! printf '%s' "$VALUE" | LC_ALL=C grep -qE '^[1-9][0-9]*$'; then
          echo "Error: $KEY '$VALUE' is not a positive integer. Existing value left unchanged." >&2
          exit 1
        fi ;;
      ship_measure_ask_per_trial_usd|ship_measure_budget_usd|ship_measure_sweep_budget_usd)
        if ! printf '%s' "$VALUE" | LC_ALL=C grep -qE '^([0-9]+(\.[0-9]+)?|\.[0-9]+)$' || ! printf '%s' "$VALUE" | LC_ALL=C grep -qE '[1-9]'; then
          echo "Error: $KEY '$VALUE' is not a positive amount in USD (e.g. 25 or 2.50). Existing value left unchanged." >&2
          exit 1
        fi ;;
      ship_greptile_early)
        if [ "$VALUE" != "true" ] && [ "$VALUE" != "false" ]; then
          echo "Error: ship_greptile_early '$VALUE' not recognized. Valid values: true, false. Existing value left unchanged." >&2
          exit 1
        fi ;;
      ship_rerun_backend)
        if [ "$VALUE" != "local" ] && [ "$VALUE" != "ubicloud" ]; then
          echo "Error: ship_rerun_backend '$VALUE' not recognized. Valid values: local, ubicloud. Existing value left unchanged." >&2
          exit 1
        fi ;;
    esac
    # design_detector_install_prompted records "never ask again" for the one-time
    # engine install offer. Rejecting a typo keeps the offer from silently coming
    # back (or never coming back) because of a mistyped value.
    if [ "$KEY" = "design_detector_install_prompted" ] && [ "$VALUE" != "true" ] && [ "$VALUE" != "false" ]; then
      echo "Error: design_detector_install_prompted '$VALUE' not recognized. Valid values: true, false. Existing value left unchanged." >&2
      exit 1
    fi
    # design_detector gates a third-party binary the user installed. Reject a typo
    # rather than coerce it: "of" must not silently re-enable or disable the scan.
    if [ "$KEY" = "design_detector" ] && [ "$VALUE" != "auto" ] && [ "$VALUE" != "off" ]; then
      echo "Error: design_detector '$VALUE' not recognized. Valid values: auto, off. Existing value left unchanged." >&2
      exit 1
    fi
    # cross_project_learnings: empty get is the first-run prompt sentinel.
    # Skills enable only on the literal "true". A typo must not persist — that
    # keeps the feature off and suppresses the prompt. Reject, like
    # codex_reviews; do not coerce (a stored default still kills the sentinel).
    if [ "$KEY" = "cross_project_learnings" ] && [ "$VALUE" != "true" ] && [ "$VALUE" != "false" ]; then
      echo "Error: cross_project_learnings '$VALUE' not recognized. Valid values: true, false. Existing value left unchanged." >&2
      exit 1
    fi
    # transcript_ingest_mode is a CONSENT key: recent/all/new@ let /sync-gbrain
    # ingest coding-agent transcripts. Reject a typo; never coerce or store it.
    if [ "$KEY" = "transcript_ingest_mode" ] && ! valid_transcript_mode "$VALUE"; then
      echo "Error: transcript_ingest_mode '$VALUE' not recognized. Valid values: recent, all, off. Existing value left unchanged." >&2
      echo "Also valid: new@<YYYY-MM-DDTHH:MM:SSZ> (only sessions that start after that UTC time, e.g. new@$(date -u +%Y-%m-%dT%H:%M:%SZ)). The +repos suffix follows transcript_repos; off never carries it. Docs: setup-gbrain/memory.md#transcripts" >&2
      exit 1
    fi
    # transcript_repos narrows transcript consent to these repos. Each entry is
    # stored as its canonical remote (host/owner/repo); an empty list would
    # deny every repo, so it is rejected: `unset` clears the allowlist.
    if [ "$KEY" = "transcript_repos" ]; then
      _clean=""
      _ifs="$IFS"; IFS=','
      for _x in $VALUE; do
        _x="$(canonical_remote "$_x")"
        [ -n "$_x" ] || continue
        case ",$_clean," in *",$_x,"*) ;; *) _clean="${_clean:+$_clean,}$_x" ;; esac
      done
      IFS="$_ifs"
      if [ -z "$_clean" ]; then
        echo "Error: transcript_repos '$VALUE' names no repo. Valid values: comma-separated git remotes (e.g. github.com/owner/repo). Existing value left unchanged. To allow every repo: gstack-config unset transcript_repos" >&2
        exit 1
      fi
      VALUE="$_clean"
    fi
    # memorable_recall is a CONSENT key: `on` lets a Claude Code hook hand every
    # prompt to a third-party binary. Reject like codex_reviews -- a typo must
    # never flip consent in either direction, so nothing is coerced or stored.
    if [ "$KEY" = "memorable_recall" ] && [ "$VALUE" != "on" ] && [ "$VALUE" != "off" ]; then
      echo "Error: memorable_recall '$VALUE' not recognized. Valid values: on, off. Existing value left unchanged." >&2
      exit 1
    fi
    # browse_extension_id (D1) decides which Chrome extension may reach the
    # browse daemon's token route and terminal socket. Reject anything that is
    # not a Chrome extension ID; "" clears the override.
    if [ "$KEY" = "browse_extension_id" ] && [ -n "$VALUE" ] && ! printf '%s' "$VALUE" | LC_ALL=C grep -qE '^[a-p]{32}$'; then
      echo "Error: browse_extension_id '$VALUE' is not a Chrome extension ID (32 letters a-p, shown on chrome://extensions). Existing value left unchanged." >&2
      exit 1
    fi
    # disabled_skills (#1206): comma-separated skill names, one value for the
    # key. Every name must be a real skill (typos get the closest name);
    # gstack and gstack-upgrade can never be disabled; "" re-enables all.
    # Rejected values leave the existing setting unchanged.
    if [ "$KEY" = "disabled_skills" ]; then
      _GSTACK_ROOT_DIR="$(cd "$(dirname "$0")/.." && pwd)"
      _known=" "
      for _md in "$_GSTACK_ROOT_DIR"/*/SKILL.md.tmpl "$_GSTACK_ROOT_DIR"/*/SKILL.md; do
        [ -f "$_md" ] || continue
        _d="$(basename "$(dirname "$_md")")"
        _n="$(sed -n '2,/^---$/ s/^name:[[:space:]]*//p' "$_md" | head -1 | tr -d '[:space:]')"
        for _x in "$_d" "${_n:-$_d}"; do
          case "$_known" in *" $_x "*) ;; *) _known="$_known$_x " ;; esac
        done
      done
      _clean=""
      for _x in $(printf '%s' "$VALUE" | tr ',' ' ' | tr -d "\"'"); do
        _x="${_x#/}"
        case "$_x" in
          gstack|gstack-upgrade)
            echo "Error: $_x cannot be disabled (it is how gstack upgrades and routes). Existing value left unchanged." >&2
            exit 1 ;;
        esac
        _bare="${_x#gstack-}"
        case "$_known" in
          *" $_bare "*|*" $_x "*) ;;
          *)
            _best="$(for _k in $_known; do printf '%s\n' "$_k"; done | awk -v a="$_bare" '
              function lev(s, t,   i, j, n, m, c, d, v) {
                n = length(s); m = length(t)
                for (i = 0; i <= n; i++) d[i, 0] = i
                for (j = 0; j <= m; j++) d[0, j] = j
                for (i = 1; i <= n; i++) for (j = 1; j <= m; j++) {
                  c = (substr(s, i, 1) == substr(t, j, 1)) ? 0 : 1
                  v = d[i-1, j] + 1; if (d[i, j-1] + 1 < v) v = d[i, j-1] + 1; if (d[i-1, j-1] + c < v) v = d[i-1, j-1] + c
                  d[i, j] = v
                }
                return d[n, m]
              }
              { x = lev(a, $0); if (best == "" || x < bd) { bd = x; best = $0 } }
              END { print best }')"
            echo "Error: unknown skill '$_x' in disabled_skills. Did you mean '$_best'? Existing value left unchanged." >&2
            exit 1 ;;
        esac
        case ",$_clean," in *",$_bare,"*) ;; *) _clean="${_clean:+$_clean,}$_bare" ;; esac
      done
      VALUE="$_clean"
      for _x in $(printf '%s' "$_clean" | tr ',' ' '); do
        for _tmpl in "$_GSTACK_ROOT_DIR"/*/SKILL.md.tmpl; do
          [ -f "$_tmpl" ] || continue
          _caller="$(basename "$(dirname "$_tmpl")")"
          [ "$_caller" = "$_x" ] && continue
          case ",$_clean," in *",$_caller,"*) continue ;; esac
          if grep -qE "INVOKE_SKILL:$_x([^a-z-]|\$)|skills/gstack/$_x/(SKILL\.md|sections)" "$_tmpl" 2>/dev/null; then
            echo "Warning: /$_caller uses /$_x. /$_x is no longer registered as a skill, but its files stay installed so /$_caller keeps working." >&2
          fi
        done
      done
    fi
    # Locked read-modify-write; the annotated header is written on first creation.
    config_lock
    config_edit_begin
    if [ "$KEY" = "transcript_ingest_mode" ] && [ "${VALUE%+repos}" != "$VALUE" ] && [ -z "$(_cfg_get transcript_repos)" ]; then
      rm -f "$_cfg_tmp"
      echo "Error: transcript_ingest_mode '$VALUE' needs a repo allowlist, but transcript_repos is not set. Existing value left unchanged. fix: gstack-config set transcript_repos <remotes>, then set transcript_ingest_mode ${VALUE%+repos}" >&2
      exit 1
    fi
    _cfg_put "$KEY" "$VALUE"
    # The allowlist and its +repos marker change together, in this one rename.
    if [ "$KEY" = "transcript_ingest_mode" ] || [ "$KEY" = "transcript_repos" ]; then
      transcript_marker_sync
      if [ "$KEY" = "transcript_ingest_mode" ]; then VALUE="$(_cfg_get transcript_ingest_mode)"; fi
    fi
    config_edit_commit
    config_unlock
    SAFE_VALUE="$VALUE"
    # Report only when another root still overrides the value just written.
    gstack_config_select "$KEY"
    if [ -n "$_gstack_cfg_root" ] && [ "$_gstack_cfg_root" != "$STATE_DIR" ] && [ "$_gstack_cfg_value" != "$SAFE_VALUE" ]; then
      echo "gstack-config: set $KEY in $CONFIG_FILE, but $KEY is still '$_gstack_cfg_value': $_gstack_cfg_root/config.yaml sets that more restrictive value, and for privacy keys the most restrictive value across state roots wins." >&2
      echo "fix: GSTACK_STATE_ROOT='$_gstack_cfg_root' $_SELF set $KEY $SAFE_VALUE ($_STATE_DOC)" >&2
    fi
    # Auto-relink skills when prefix setting changes (skip during setup to avoid recursive call)
    if { [ "$KEY" = "skill_prefix" ] || [ "$KEY" = "disabled_skills" ]; } && [ -z "${GSTACK_SETUP_RUNNING:-}" ]; then
      GSTACK_RELINK="$(dirname "$0")/gstack-relink"
      if [ -x "$GSTACK_RELINK" ] && ! "$GSTACK_RELINK"; then
        echo "gstack-config: $KEY saved, but relinking the installed skills failed (see above), so skill names may not match yet. Retry: $GSTACK_RELINK" >&2
      fi
      # gstack-relink covers Claude installs; every other registered host
      # applies the change on its next setup run.
      if [ "$KEY" = "disabled_skills" ] && [ -f "$(dirname "$0")/gstack-install-registry.sh" ]; then
        ( GSTACK_STATE_ROOT="$STATE_DIR"; . "$(dirname "$0")/gstack-install-registry.sh"
          gstack_install_registry_rows | awk -F '\t' '$1 != "claude" { print "  apply to " $1 " (" $4 "): cd " $6 " && ./setup --host " $1 }' )
      fi
    fi
    ;;
  unset)
    KEY="${2:?Usage: gstack-config unset <key>}"
    if ! printf '%s' "$KEY" | LC_ALL=C grep -qE '^[a-zA-Z0-9_]+(@[a-zA-Z0-9]+)?$'; then
      echo "Error: key must contain only alphanumeric characters, underscores, and an optional @<endpoint-id> suffix" >&2
      exit 1
    fi
    [ -f "$CONFIG_FILE" ] || exit 0
    config_lock
    config_edit_begin
    _cfg_del "$KEY"
    # Clearing the allowlist drops the +repos marker in the same write.
    if [ "$KEY" = "transcript_repos" ]; then transcript_marker_sync; fi
    config_edit_commit
    config_unlock
    ;;
  list)
    if [ -f "$CONFIG_FILE" ]; then
      cat "$CONFIG_FILE"
    fi
    echo ""
    echo "# ─── Active values (including defaults for unset keys) ───"
    report_root_disagreement
    for KEY in proactive routing_declined telemetry auto_upgrade update_check \
               skill_prefix explain_level \
               codex_reviews gstack_contributor skip_eng_review workspace_root \
               artifacts_sync_mode artifacts_sync_mode_prompted artifacts_sync_removals plan_tune_hooks \
               timeline_stop_hook design_detector design_detector_install_prompted memorable_recall \
               browse_extension_id ship_measure_rule_trials ship_measure_behavior_panels \
               ship_measure_judge_outputs ship_measure_ask_per_trial_usd ship_measure_budget_usd \
               ship_measure_max_rounds ship_measure_sweep_cases ship_measure_sweep_budget_usd ship_rerun_backend \
               plan_review_tier implementation_tier model_frontier_claude model_frontier_openai \
               model_smart_claude model_smart_openai; do
      gstack_config_select "$KEY"
      VALUE="$_gstack_cfg_value"
      SOURCE="default"
      if [ -n "$VALUE" ]; then
        SOURCE="set"
        _gstack_config_rank "$KEY" x
        [ -n "$_gstack_cfg_rank" ] && SOURCE="set, $_gstack_cfg_root"
      else
        VALUE=$(lookup_default "$KEY")
      fi
      printf '  %-24s %s (%s)\n' "$KEY:" "$VALUE" "$SOURCE"
    done
    ;;
  defaults)
    echo "# gstack-config defaults"
    for KEY in proactive routing_declined telemetry auto_upgrade update_check \
               skill_prefix explain_level \
               codex_reviews gstack_contributor skip_eng_review workspace_root \
               artifacts_sync_mode artifacts_sync_mode_prompted artifacts_sync_removals plan_tune_hooks \
               timeline_stop_hook design_detector design_detector_install_prompted memorable_recall \
               browse_extension_id ship_measure_rule_trials ship_measure_behavior_panels \
               ship_measure_judge_outputs ship_measure_ask_per_trial_usd ship_measure_budget_usd \
               ship_measure_max_rounds ship_measure_sweep_cases ship_measure_sweep_budget_usd ship_rerun_backend \
               plan_review_tier implementation_tier model_frontier_claude model_frontier_openai \
               model_smart_claude model_smart_openai; do
      printf '  %-24s %s\n' "$KEY:" "$(lookup_default "$KEY")"
    done
    ;;
  endpoint-hash)
    # Brain integration helper (T10): print active brain endpoint sha8
    endpoint_hash_with_collision_check
    ;;
  resolve-user-slug)
    # Brain integration helper (T16 / D4 A3): resolve + persist user-slug
    resolve_user_slug
    ;;
  gbrain-refresh)
    # Brain integration helper: re-detect gbrain installation state and
    # persist to ~/.gstack/gbrain-detection.json. gen-skill-docs reads this
    # file (when invoked with --respect-detection) to decide whether to
    # render GBRAIN_CONTEXT_LOAD and GBRAIN_SAVE_RESULTS blocks in
    # generated SKILL.md files.
    #
    # Run this after installing or uninstalling gbrain so your locally
    # generated SKILL.md files match your installation state.
    SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
    . "$SCRIPT_DIR/gstack-render-claude.sh" 2>/dev/null || { echo "$0: $SCRIPT_DIR/gstack-render-claude.sh is missing. fix: reinstall with ./setup or /gstack-upgrade" >&2; exit 1; }
    DETECT_BIN="$SCRIPT_DIR/gstack-gbrain-detect"
    DETECTION_FILE="$STATE_DIR/gbrain-detection.json"
    mkdir -p "$STATE_DIR"
    if [ ! -x "$DETECT_BIN" ]; then
      echo "gstack-gbrain-detect not found at $DETECT_BIN" >&2
      exit 1
    fi
    if ! "$DETECT_BIN" > "$DETECTION_FILE.tmp.$$" 2>/dev/null; then
      printf '{"gbrain_on_path":false,"gbrain_local_status":"no-cli"}\n' > "$DETECTION_FILE.tmp.$$"
    fi
    mv "$DETECTION_FILE.tmp.$$" "$DETECTION_FILE"

    # Summarize for the user. Use python (already required elsewhere) to
    # parse the JSON portably; fall back to grep if python is unavailable.
    # The file goes in on stdin (E6, #1967): bash opens the path, so a native
    # Windows Python under Git Bash never has to resolve an MSYS /c/... path.
    PYTHON_CMD=$(command -v python3 || command -v python || true)
    if [ -n "$PYTHON_CMD" ]; then
      STATUS=$("$PYTHON_CMD" -c "import json,sys; d=json.load(sys.stdin); print(d.get('gbrain_local_status','unknown'))" < "$DETECTION_FILE" 2>/dev/null || echo unknown)
      VERSION=$("$PYTHON_CMD" -c "import json,sys; d=json.load(sys.stdin); print(d.get('gbrain_version') or 'unknown')" < "$DETECTION_FILE" 2>/dev/null || echo unknown)
    else
      STATUS=$(grep -o '"gbrain_local_status":[[:space:]]*"[^"]*"' "$DETECTION_FILE" | sed 's/.*"\([^"]*\)"$/\1/')
      VERSION=$(grep -o '"gbrain_version":[[:space:]]*"[^"]*"' "$DETECTION_FILE" | sed 's/.*"\([^"]*\)"$/\1/')
      [ -z "$STATUS" ] && STATUS=unknown
      [ -z "$VERSION" ] && VERSION=unknown
    fi

    case "$STATUS" in
      ok|timeout|db-unreachable|thin-client|engine-locked)
        # "timeout" = slow-but-healthy engine (#1964); "db-unreachable" =
        # network/DNS failure with an intact config, transient like timeout
        # (A2); "thin-client" =
        # remote-HTTP MCP brain, no local engine by design (#2051);
        # "engine-locked" = same class (#2456): PGLite is single-writer, so a
        # live `gbrain serve` (typically an MCP server) holds the embedded DB.
        # gbrain is installed and healthy; a transient lock must not strip
        # brain blocks out of every SKILL.md. All get the same treatment as
        # "ok", matching gstack-gbrain-detect --is-ok and gen-skill-docs.
        echo "Detected gbrain v$VERSION (local-status: $STATUS)."
        # Render brain-aware blocks into an UNTRACKED out-dir (#2569) and
        # repoint the installed skills at it — the old in-place render wrote
        # into TRACKED files of the global install checkout, so the checkout
        # stayed permanently dirty and every upgrade grew a redundant stash.
        # Guards (never mutate an arbitrary directory): the install must
        # exist, not be a symlink (a symlinked install points at a dev
        # worktree — bin/dev-setup owns that flow), and look like a real
        # gstack clone.
        INSTALL_DIR="$HOME/.claude/skills/gstack"
        RENDER_DIR="${GSTACK_USER_RENDER_DIR:-$STATE_DIR/render/claude}"
        if [ ! -d "$INSTALL_DIR" ]; then
          echo "No global install at $INSTALL_DIR — nothing to render. (Dev workspaces get blocks via bin/dev-setup.)"
        elif [ -L "$INSTALL_DIR" ]; then
          echo "Skip: $INSTALL_DIR is a symlink (likely a dev worktree). Run bin/dev-setup in that worktree instead."
        elif [ ! -f "$INSTALL_DIR/VERSION" ] || [ ! -f "$INSTALL_DIR/package.json" ]; then
          echo "Skip: $INSTALL_DIR doesn't look like a gstack clone (missing VERSION/package.json) — refusing to modify it."
        elif ! command -v bun >/dev/null 2>&1; then
          echo "Skip: bun not on PATH — can't render. Install bun, then re-run 'gstack-config gbrain-refresh'."
        else
          # Render into a tmp dir and swap it in only on SUCCESS. Installed
          # skills SYMLINK into $RENDER_DIR (gstack-relink prefers it), so
          # wiping it before the render meant one transient failure (bun
          # error, disk full, broken template) left every brain-aware
          # SKILL.md link dangling — the whole skill set vanished from
          # Claude Code until a successful re-render. A failed render now
          # leaves the previous render fully intact.
          gstack_claude_overlay "$INSTALL_DIR" "$0"
          RENDER_TMP="$RENDER_DIR.tmp.$$"
          rm -rf "$RENDER_TMP"
          if ( cd "$INSTALL_DIR" && bun run gen:skill-docs:user --host claude --out-dir "$RENDER_TMP" --link-root "$RENDER_DIR" --model "$_GSTACK_OVERLAY" >/dev/null 2>&1 ); then
            gstack_render_lock "$RENDER_DIR"
            _swap_in_render "$RENDER_DIR" "$RENDER_TMP"
            gstack_render_unlock "$RENDER_DIR"
            gstack_claude_render_settle "$INSTALL_DIR" "$RENDER_DIR" ok rendered
            # Repoint installed skills at the render — gstack-relink prefers
            # the render dir when present.
            "$INSTALL_DIR/bin/gstack-relink" >/dev/null 2>&1 || true
            echo "Rendered brain-aware blocks into $RENDER_DIR — now live across all your projects' Claude sessions."
            echo "The install checkout stays clean: upgrades no longer stash generated render dirt (#2569)."
          else
            rm -rf "$RENDER_TMP"
            echo "Warning: render failed — previous render (if any) left in place, links stay valid."
            echo "Run 'cd $INSTALL_DIR && bun run gen:skill-docs:user --host claude --out-dir $RENDER_DIR' manually to see the error."
            gstack_claude_render_settle "$INSTALL_DIR" "$RENDER_DIR" ok failed
            "$INSTALL_DIR/bin/gstack-relink" >/dev/null 2>&1 || true
          fi
        fi
        ;;
      *)
        echo "gbrain not detected (local-status: $STATUS) → brain-aware blocks will be suppressed in planning-skill SKILL.md files."
        echo "Install gbrain (see /setup-gbrain) and re-run 'gstack-config gbrain-refresh' once it's configured."
        # Drop a brain-aware render, or re-render a pinned overlay without
        # brain blocks, so removing gbrain keeps the chosen overlay.
        INSTALL_DIR="$HOME/.claude/skills/gstack"
        RENDER_DIR="${GSTACK_USER_RENDER_DIR:-$STATE_DIR/render/claude}"
        if { [ -d "$RENDER_DIR" ] || "$0" has claude_overlay_model; } \
          && [ -d "$INSTALL_DIR" ] && [ ! -L "$INSTALL_DIR" ] && [ -f "$INSTALL_DIR/VERSION" ] && [ -f "$INSTALL_DIR/package.json" ]; then
          if ! command -v bun >/dev/null 2>&1; then
            echo "Skip: bun not on PATH — the Claude render at $RENDER_DIR was not refreshed. Install bun, then re-run 'gstack-config gbrain-refresh'."
          else
            gstack_claude_overlay "$INSTALL_DIR" "$0"
            gstack_claude_render_action "$RENDER_DIR" absent
            if [ "$_GSTACK_RENDER_ACTION" = plain ]; then
              if gstack_claude_render_plain "$INSTALL_DIR" "$RENDER_DIR"; then
                gstack_claude_render_settle "$INSTALL_DIR" "$RENDER_DIR" absent rendered
              else
                gstack_claude_render_settle "$INSTALL_DIR" "$RENDER_DIR" absent failed
              fi
            else
              if [ -d "$RENDER_DIR" ]; then
                rm -rf "$RENDER_DIR"
                echo "Removed the brain-aware render at $RENDER_DIR; Claude skills serve the committed files."
              fi
              gstack_claude_render_settle "$INSTALL_DIR" "$RENDER_DIR" absent removed
            fi
            "$INSTALL_DIR/bin/gstack-relink" >/dev/null 2>&1 || true
          fi
        fi
        ;;
    esac
    ;;
  *)
    echo "Usage: gstack-config {get|has|set|unset|list|defaults|endpoint-hash|resolve-user-slug|gbrain-refresh} [key] [value]"
    exit 1
    ;;
esac