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>

bin/gstack-gbrain-detect

@@ -234,4 +234,14 @@ function main(): void {
   process.stdout.write(JSON.stringify(out, null, 2) + "\n");
 }
 
+// --is-ok: live engine-status gate. Exits 0 iff gbrain is usable ("ok"), 1
+// otherwise. Runs detection live (never reads the possibly-stale
+// gbrain-detection.json), so callers — setup, bin/dev-setup, and
+// `gstack-config gbrain-refresh` — can decide whether to render the gbrain
+// :user variant without duplicating the JSON grep. Prints nothing on stdout.
+if (process.argv.includes("--is-ok")) {
+  const noCache = process.env.GSTACK_DETECT_NO_CACHE === "1";
+  process.exit(localEngineStatus({ noCache }) === "ok" ? 0 : 1);
+}
+
 main();