v1.57.9.0 feat: source-clean gbrain render (dev-setup --out-dir + machine-wide gbrain-refresh) (#1951)

* feat(gbrain-detect): add --is-ok live-detection exit-code gate

Single source of truth for 'is gbrain usable'. Runs live detection (never
reads the possibly-stale gbrain-detection.json) and exits 0 iff status is ok,
so setup, bin/dev-setup, and gstack-config can gate brain-aware rendering on
one shared check instead of re-grepping the JSON.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* feat(gen-skill-docs): add --out-dir with surgical section-path rewrite

--out-dir <abs-dir> mirrors the Claude skill tree (SKILL.md + sections) into a
separate directory instead of writing in place, and rewrites the literal
section-base path (~/.claude/skills/gstack/<skill>/sections/) in generated
content to point at the out-dir. The rewrite is surgical: only /sections/ paths
move; bin/, browse/, docs/ references stay pointed at the global install.
Global extras (proactive-suggestions.json) are skipped in out-dir mode. Default
(no flag) behavior is unchanged.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* feat(dev-setup): render gbrain :user variant to an untracked workspace dir

Stops the dev/Conductor workspace from dirtying tracked SKILL.md source. setup
honors GSTACK_SKIP_GBRAIN_REGEN (passed inline by dev-setup, never exported) and
skips the in-place :user regen; detection is still persisted (PID-unique tmp so
concurrent workspaces can't clobber it). dev-setup instead renders the :user
variant into .claude/gstack-rendered (gitignored, per-workspace) and repoints
the workspace SKILL.md symlinks at it, so the workspace gets brain-aware blocks
while the worktree stays canonical. dev-teardown removes the render.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* feat(dev-skill): refresh the untracked brain-aware render on template change

After the default in-place regen (which keeps the worktree canonical and runs
validation), also re-render the :user variant into .claude/gstack-rendered when
it exists, so live template edits reflect at the workspace's runtime. Never
creates the render dir during plain template dev.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* feat(gstack-config): gbrain-refresh renders brain-aware blocks into the install

Extends gbrain-refresh to render the :user variant into the global install
(~/.claude/skills/gstack) so every project's Claude sessions get brain-aware
blocks, not just the gstack dev workspace. Guarded against mutating the wrong
directory: the target must exist, not be a symlink (a symlinked install points
at a dev worktree), and look like a real gstack clone (VERSION + package.json).
Idempotent and self-documenting. CLAUDE.md's deploy section now notes that
'git reset --hard' reverts the blocks and to re-run gbrain-refresh.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* test: cover gstack-gbrain-detect --is-ok + dev-skill render refresh

Fills the two automated-coverage gaps from the eng review: --is-ok exit-code
gate (no-cli -> nonzero, healthy -> 0, plus an agrees-with-JSON no-skew check
reusing the deterministic fake-gbrain harness) and a static tripwire that
dev-skill re-renders the :user variant into the workspace render dir only when
it already exists.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* chore: bump version and changelog (v1.57.9.0)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* docs: document brain-aware dev-setup render for v1.57.9.0

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

CONTRIBUTING.md

@@ -106,6 +106,22 @@ bun run build
 bin/dev-teardown
 ```
 
+### Brain-aware blocks in a dev workspace (gbrain installed)
+
+If gbrain is installed and usable (`bin/gstack-gbrain-detect --is-ok` exits 0),
+`bin/dev-setup` keeps your tracked `SKILL.md` files canonical and renders the
+brain-aware variant (the `GBRAIN_CONTEXT_LOAD` / `GBRAIN_SAVE_RESULTS` blocks)
+into `.claude/gstack-rendered/` (gitignored, per-workspace). It then repoints the
+workspace's `SKILL.md` symlinks at that render, so your Claude sessions get the
+full gbrain experience while `git status` stays clean. Under the hood, dev-setup
+passes `GSTACK_SKIP_GBRAIN_REGEN=1` inline to the nested `./setup` (so it never
+dirties tracked source) and runs `gen:skill-docs:user --out-dir .claude/gstack-rendered`,
+which rewrites only the section-base paths to point at the render. `bin/dev-teardown`
+removes the render. To make the blocks live across your *other* projects' Claude
+sessions, run `gstack-config gbrain-refresh`, which renders them into the global
+install (`~/.claude/skills/gstack`), guarded so it never touches a symlinked or
+non-gstack directory.
+
 ## Testing & evals
 
 ### Setup
@@ -334,8 +350,8 @@ If you're using [Conductor](https://conductor.build) to run multiple Claude Code
 
 | Hook | Script | What it does |
 |------|--------|-------------|
-| `setup` | `bin/dev-setup` | Copies `.env` from main worktree, installs deps, symlinks skills, runs `./setup` non-interactively |
-| `archive` | `bin/dev-teardown` | Removes skill symlinks, cleans up `.claude/` directory |
+| `setup` | `bin/dev-setup` | Copies `.env` from main worktree, installs deps, symlinks skills, runs `./setup` non-interactively, and (if gbrain is installed) renders brain-aware blocks into `.claude/gstack-rendered/` without dirtying tracked source |
+| `archive` | `bin/dev-teardown` | Removes skill symlinks, the `.claude/gstack-rendered/` render, and cleans up `.claude/` directory |
 
 When Conductor creates a new workspace, `bin/dev-setup` runs automatically. It detects the main worktree (via `git worktree list`), copies your `.env` so API keys carry over, and sets up dev mode — no manual steps needed.