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/Auth.md

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+# Feature: Auth
+
+**Module path:** `lib/features/auth/` + `lib/core/auth/`
+
+## Overview
+Handles user login, registration, and session management.
+
+## Screens
+- `login_screen.dart` — Mobile login
+- `desktop_login_screen.dart` — Desktop login
+
+## Key Files
+| File | Purpose |
+|------|---------|
+| `lib/core/auth/` | Auth logic, tokens, session |
+| `lib/features/auth/` | Auth feature UI & state |
+
+## Flow
+- [ ] Document login flow
+- [ ] Document registration flow
+- [ ] Document session persistence (shared_preferences?)
+
+## Notes
+> Add notes about OAuth, JWT, or custom auth as you discover them
+
+## Related
+- [[01 - Architecture/State Management]]
+- [[04 - API & Backend/API Notes]]

_notes/02 - Features/Events.md

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+# Feature: Events
+
+**Module path:** `lib/features/events/`
+
+## Overview
+Core feature — event discovery, listing, detail view, booking, and calendar integration.
+
+## Related Screens
+- `home_screen.dart` / `home_desktop_screen.dart` — Event feed
+- `booking_screen.dart` — Event booking flow
+- `calendar_screen.dart` — Calendar view of events
+- `search_screen.dart` — Event search
+
+## Key Capabilities
+- [ ] Event listing & filtering
+- [ ] Event detail view
+- [ ] Booking flow
+- [ ] Calendar integration (`table_calendar`)
+- [ ] Location/map view (`google_maps_flutter`, `geolocator`)
+- [ ] Media (images/video via `image_picker`, `video_player`)
+
+## API Endpoints
+> Document event API endpoints here as you discover them
+
+## Notes
+
+## Related
+- [[02 - Features/Reviews]]
+- [[03 - Screens/Screen Index]]

_notes/02 - Features/Gamification.md

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+# Feature: Gamification
+
+**Module path:** `lib/features/gamification/`
+
+## Overview
+Engagement system using points, rankings, and achievements to reward users.
+
+## Components
+- **EP (Experience Points)** — earned by attending/booking events
+- **RP (Reward Points)** — redeemable rewards currency
+- **Leaderboard** — ranked user standings
+- **Achievements** — milestone badges/unlocks
+
+## Key Files
+| File | Purpose |
+|------|---------|
+| `lib/features/gamification/` | All gamification logic & UI |
+
+## Game Mechanics
+- [ ] Document EP earning rules
+- [ ] Document RP earning rules
+- [ ] Document achievement triggers
+- [ ] Document leaderboard ranking logic
+
+## Notes
+
+## Related
+- [[02 - Features/Events]]
+- [[04 - API & Backend/API Notes]]

_notes/02 - Features/Reviews.md

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+# 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]]