feat: complete Event Log, Ledger, Memory, Cascade Router, Upgrade Queue, Activity Feed

This commit implements six major features:

1. Event Log System (src/swarm/event_log.py)
   - SQLite-based audit trail for all swarm events
   - Task lifecycle tracking (created, assigned, completed, failed)
   - Agent lifecycle tracking (joined, left, status changes)
   - Integrated with coordinator for automatic logging
   - Dashboard page at /swarm/events

2. Lightning Ledger (src/lightning/ledger.py)
   - Transaction tracking for Lightning Network payments
   - Balance calculations (incoming, outgoing, net, available)
   - Integrated with payment_handler for automatic logging
   - Dashboard page at /lightning/ledger

3. Semantic Memory / Vector Store (src/memory/vector_store.py)
   - Embedding-based similarity search for Echo agent
   - Fallback to keyword matching if sentence-transformers unavailable
   - Personal facts storage and retrieval
   - Dashboard page at /memory

4. Cascade Router Integration (src/timmy/cascade_adapter.py)
   - Automatic LLM failover between providers (Ollama → AirLLM → API)
   - Circuit breaker pattern for failing providers
   - Metrics tracking per provider (latency, error rates)
   - Dashboard status page at /router/status

5. Self-Upgrade Approval Queue (src/upgrades/)
   - State machine for self-modifications: proposed → approved/rejected → applied/failed
   - Human approval required before applying changes
   - Git integration for branch management
   - Dashboard queue at /self-modify/queue

6. Real-Time Activity Feed (src/events/broadcaster.py)
   - WebSocket-based live activity streaming
   - Bridges event_log to dashboard clients
   - Activity panel on /swarm/live

Tests:
- 101 unit tests passing
- 4 new E2E test files for Selenium testing
- Run with: SELENIUM_UI=1 pytest tests/functional/ -v --headed

Documentation:
- 6 ADRs (017-022) documenting architecture decisions
- Implementation summary in docs/IMPLEMENTATION_SUMMARY.md
- Architecture diagram in docs/architecture-v2.md

src/dashboard/app.py

@@ -27,6 +27,11 @@ from dashboard.routes.spark import router as spark_router
 from dashboard.routes.creative import router as creative_router
 from dashboard.routes.discord import router as discord_router
 from dashboard.routes.self_modify import router as self_modify_router
+from dashboard.routes.events import router as events_router
+from dashboard.routes.ledger import router as ledger_router
+from dashboard.routes.memory import router as memory_router
+from dashboard.routes.router import router as router_status_router
+from dashboard.routes.upgrades import router as upgrades_router
 from router.api import router as cascade_router
 
 logging.basicConfig(
@@ -166,6 +171,11 @@ app.include_router(spark_router)
 app.include_router(creative_router)
 app.include_router(discord_router)
 app.include_router(self_modify_router)
+app.include_router(events_router)
+app.include_router(ledger_router)
+app.include_router(memory_router)
+app.include_router(router_status_router)
+app.include_router(upgrades_router)
 app.include_router(cascade_router)