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/templates/base.html

@@ -30,6 +30,11 @@
       <a href="/spark/ui" class="mc-test-link">SPARK</a>
       <a href="/marketplace/ui" class="mc-test-link">MARKET</a>
       <a href="/tools" class="mc-test-link">TOOLS</a>
+      <a href="/swarm/events" class="mc-test-link">EVENTS</a>
+      <a href="/lightning/ledger" class="mc-test-link">LEDGER</a>
+      <a href="/memory" class="mc-test-link">MEMORY</a>
+      <a href="/router/status" class="mc-test-link">ROUTER</a>
+      <a href="/self-modify/queue" class="mc-test-link">UPGRADES</a>
       <a href="/creative/ui" class="mc-test-link">CREATIVE</a>
       <a href="/mobile" class="mc-test-link" title="Mobile-optimized view">MOBILE</a>
       <button id="enable-notifications" class="mc-test-link" style="background:none;cursor:pointer;" title="Enable notifications">&#x1F514;</button>
@@ -55,6 +60,9 @@
     <a href="/spark/ui" class="mc-mobile-link">SPARK</a>
     <a href="/marketplace/ui" class="mc-mobile-link">MARKET</a>
     <a href="/tools" class="mc-mobile-link">TOOLS</a>
+    <a href="/swarm/events" class="mc-mobile-link">EVENTS</a>
+    <a href="/lightning/ledger" class="mc-mobile-link">LEDGER</a>
+    <a href="/memory" class="mc-mobile-link">MEMORY</a>
     <a href="/creative/ui" class="mc-mobile-link">CREATIVE</a>
     <a href="/voice/button" class="mc-mobile-link">VOICE</a>
     <a href="/mobile" class="mc-mobile-link">MOBILE</a>