chore: regenerate SKILL.md files and update tests + TODOS

- Regenerate all SKILL.md from updated templates
- Update skill-validation tests for new gstack-slug output (3 vars)
  and new path patterns (plans/ceo, gstack-slug over REMOTE_SLUG)
- Update gen-skill-docs tests for new review path ($BRANCH.jsonl)
- Mark setup-gstack-upload + gstack-upload helper as superseded
  in TODOS.md (replaced by Supabase Storage)
- Fix last REMOTE_SLUG reference in greptile-triage.md

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

review/SKILL.md

@@ -227,8 +227,8 @@ eval $(~/.claude/skills/gstack/bin/gstack-diff-scope <base> 2>/dev/null)
 
 ```bash
 eval $(~/.claude/skills/gstack/bin/gstack-slug 2>/dev/null)
-mkdir -p ~/.gstack/projects/$SLUG
-echo '{"skill":"design-review-lite","timestamp":"TIMESTAMP","status":"STATUS","findings":N,"auto_fixed":M}' >> ~/.gstack/projects/$SLUG/$BRANCH-reviews.jsonl
+mkdir -p $PROJECTS_DIR/$SLUG/reviews
+echo '{"skill":"design-review-lite","timestamp":"TIMESTAMP","status":"STATUS","findings":N,"auto_fixed":M}' >> $PROJECTS_DIR/$SLUG/reviews/$BRANCH.jsonl
 ```
 
 Substitute: TIMESTAMP = ISO 8601 datetime, STATUS = "clean" if 0 findings or "issues_found", N = total findings, M = auto-fixed count.

review/greptile-triage.md

@@ -212,7 +212,7 @@ After appending to both history files, sync each triage entry to the team store.
 cat > /tmp/gstack-greptile-entry.json << 'GEOF'
 {
   "date": "<YYYY-MM-DD>",
-  "repo": "<owner/repo from REMOTE_SLUG>",
+  "repo": "<owner/repo from SLUG>",
   "triage_type": "<fp|fix|already-fixed>",
   "file_pattern": "<file-pattern>",
   "category": "<category>"