chore: remove vibe-coding artifacts from tracking, sync notes and obsidian config

- Untrack .claude/launch.json (Claude Code config)
- Add .claude/, .mcp.json, CLAUDE.md, and AI-generated CSVs to .gitignore
- Add _notes/ vault (architecture, API, tasks, bugs, infra docs)
- Add .obsidian/ plugin/vault config (workspace state excluded)
- Sync CHANGELOG.md

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

_notes/02 - Features/Reviews.md

@@ -0,0 +1,24 @@
+# Feature: Reviews
+
+**Module path:** `lib/features/reviews/`
+
+## Overview
+Allows users to leave and read reviews for events they have attended.
+
+## Key Files
+| File | Purpose |
+|------|---------|
+| `lib/features/reviews/` | Review UI & logic |
+
+## Flow
+- [ ] Document review submission flow
+- [ ] Document review display (event detail page?)
+- [ ] Document rating system (stars, score?)
+
+## API Endpoints
+> Document review API endpoints here
+
+## Notes
+
+## Related
+- [[02 - Features/Events]]