chore: regenerate SKILL.md docs + golden fixtures (single regen for the template block)

Pure generator output for the six template/resolver commits above (learnings
capture, untrusted-content warning, review paths, pair-agent consent, codex
resume note, upgrade ff-only, brain-sync block) — bun run gen:skill-docs +
--host codex + --host factory, with the three ship golden fixtures refreshed
per the documented procedure. The three sidecar-path pins in
gen-skill-docs.test.ts move to the new installed-root/$GSTACK_ROOT contract
(#2518). Restores template freshness; full suite green from here.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

ship/sections/greptile.md

@@ -6,7 +6,7 @@
 
 **Subagent prompt:**
 
-> You are classifying Greptile review comments for a /ship workflow. Read `.claude/skills/review/greptile-triage.md` and follow the fetch, filter, classify, and **escalation detection** steps. Do NOT fix code, do NOT reply to comments, do NOT commit — report only.
+> You are classifying Greptile review comments for a /ship workflow. Read `~/.claude/skills/gstack/review/greptile-triage.md` and follow the fetch, filter, classify, and **escalation detection** steps. Do NOT fix code, do NOT reply to comments, do NOT commit — report only.
 >
 > For each comment, assign: `classification` (`valid_actionable`, `already_fixed`, `false_positive`, `suppressed`), `escalation_tier` (1 or 2), the file:line or [top-level] tag, body summary, and permalink URL.
 >

ship/sections/review-army.md

@@ -4,7 +4,7 @@
 
 Review the diff for structural issues that tests don't catch.
 
-1. Read `.claude/skills/review/checklist.md`. If the file cannot be read, **STOP** and report the error.
+1. Read `~/.claude/skills/gstack/review/checklist.md`. If the file cannot be read, **STOP** and report the error.
 
 2. Run `git diff origin/<base>` to get the full diff (scoped to feature changes against the freshly-fetched base branch).