fix(setup-gbrain): invoke gstack-memory-ingest/gstack-gbrain-sync via bun run + .ts

/setup-gbrain's transcript-ingest steps told the agent to run
bin/gstack-memory-ingest and bin/gstack-gbrain-sync by BARE name. Neither
exists — only the .ts files ship (mode 644, no bin alias) — so the agent
dutifully reported 'script missing at install root' and the ingest/full-
sync steps dead-ended on every host (hit live under Codex; the Claude
render carries the same text).

All four template sites (probe, silent-bulk, post-answer full sync, the
preamble-hook incremental mention) and the four memory.md reference-doc
sites now use the repo's established form: 'bun run <path>/gstack-memory-
ingest.ts …' / 'bun run <path>/gstack-gbrain-sync.ts …' — matching what
sync-gbrain already does. Generated SKILL.md regenerated from the template
in the same commit.

Re-derived from PR #2409 by @SomSamantray per the wave's screening rule
(the PR edited the generated SKILL.md directly; the generated file must
come from gen:skill-docs). The contributor's structural test rides along
as-is: bare-invocation regexes with negative .ts lookahead and backslash-
continuation coverage pin every site, so the drift can't return. The
referenced-paths ratchet in test/setup-claude-skill-assets.test.ts drops
its two #2250 known-broken entries — the class-2 assertion now guards
these paths again.

Verified against #2250's site list (template lines 690/735/784-area, all
covered) plus a fresh grep: zero bare invocations remain in the template
or memory.md; the one prose mention ('gstack-memory-ingest now persists…')
is not an invocation and stays.

Fixes #2250
Fixes #2393

Co-authored-by: SomSamantray <SomSamantray@users.noreply.github.com>
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

setup-gbrain/memory.md

@@ -47,9 +47,9 @@ v1.33.0.0 — off by default. To re-enable it (adds ~4-8 min to cold runs
 on a large transcript corpus), use either:
 
 ```bash
-gstack-memory-ingest --bulk --scan-secrets
+bun run bin/gstack-memory-ingest.ts --bulk --scan-secrets
 # or
-GSTACK_MEMORY_INGEST_SCAN_SECRETS=1 gstack-memory-ingest --bulk
+GSTACK_MEMORY_INGEST_SCAN_SECRETS=1 bun run bin/gstack-memory-ingest.ts --bulk
 ```
 
 When enabled, gitleaks covers:
@@ -155,7 +155,7 @@ verdict block. If a row is RED, the row tells you what to do.
 Common cases:
 
 - **Salience block is empty** — your transcripts may not be ingested
-  yet. Run `gstack-gbrain-sync --full` to do a full pass.
+  yet. Run `bun run bin/gstack-gbrain-sync.ts --full` to do a full pass.
 
 - **"gbrain CLI missing" in the preamble output** — gbrain isn't on
   your PATH. Run `/setup-gbrain` to install/wire it.
@@ -166,7 +166,7 @@ Common cases:
   --pglite && gbrain import <brain-remote-clone-dir>`.
 
 - **A page has stale or wrong content** — `gbrain delete_page <slug>`,
-  then re-run `gstack-gbrain-sync --incremental` to re-ingest from
+  then re-run `bun run bin/gstack-gbrain-sync.ts --incremental` to re-ingest from
   source if the source file is still on disk and unchanged.
 
 ## Privacy + audit