feat: Implement ACE Context Engineering framework (SYS_17)

Complete implementation of Agentic Context Engineering (ACE) framework:

Core modules (optimization_engine/context/):
- playbook.py: AtomizerPlaybook with helpful/harmful scoring
- reflector.py: AtomizerReflector for insight extraction
- session_state.py: Context isolation (exposed/isolated state)
- feedback_loop.py: Automated learning from trial results
- compaction.py: Long-session context management
- cache_monitor.py: KV-cache optimization tracking
- runner_integration.py: OptimizationRunner integration

Dashboard integration:
- context.py: 12 REST API endpoints for playbook management

Tests:
- test_context_engineering.py: 44 unit tests
- test_context_integration.py: 16 integration tests

Documentation:
- CONTEXT_ENGINEERING_REPORT.md: Comprehensive implementation report
- CONTEXT_ENGINEERING_API.md: Complete API reference
- SYS_17_CONTEXT_ENGINEERING.md: System protocol
- Updated cheatsheet with SYS_17 quick reference
- Enhanced bootstrap (00_BOOTSTRAP_V2.md)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

atomizer-dashboard/backend/api/main.py

@@ -12,7 +12,7 @@ import sys
 # Add parent directory to path to import optimization_engine
 sys.path.append(str(Path(__file__).parent.parent.parent.parent))
 
-from api.routes import optimization, claude, terminal, insights
+from api.routes import optimization, claude, terminal, insights, context
 from api.websocket import optimization_stream
 
 # Create FastAPI app
@@ -37,6 +37,7 @@ app.include_router(optimization_stream.router, prefix="/api/ws", tags=["websocke
 app.include_router(claude.router, prefix="/api/claude", tags=["claude"])
 app.include_router(terminal.router, prefix="/api/terminal", tags=["terminal"])
 app.include_router(insights.router, prefix="/api/insights", tags=["insights"])
+app.include_router(context.router, prefix="/api/context", tags=["context"])
 
 @app.get("/")
 async def root():