Merge branch 'main' into garrytan/team-supabase-store

Resolved conflicts across 23 files. Key merge decisions:
- Adopted main's TemplateContext type in gen-skill-docs.ts
- Adopted main's new features (trigger phrases, codex integration,
  analytics, proactive config, review chaining)
- Replaced gstack-review-log/gstack-review-read helpers with inline
  approach using $PROJECTS_DIR/$SLUG/reviews/$BRANCH.jsonl paths
- Added "commit":"COMMIT" field to all review log entries (from main)
- Kept our $PROJECTS_DIR/$SLUG path reorganization throughout
- Added Codex E2E test from main + our E2E isolation cleanup

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

.gitignore

@@ -3,6 +3,7 @@ node_modules/
 browse/dist/
 .gstack/
 .claude/skills/
+.context/
 /tmp/
 *.log
 bun.lock