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>

.claude/ATOMIZER_CONTEXT.md

@@ -172,7 +172,7 @@ studies/{geometry_type}/{study_name}/
 │ SYS_10: IMSO (single-obj)    SYS_11: Multi-objective           │
 │ SYS_12: Extractors           SYS_13: Dashboard                  │
 │ SYS_14: Neural Accel         SYS_15: Method Selector            │
-│ SYS_16: Study Insights                                          │
+│ SYS_16: Study Insights       SYS_17: Context Engineering        │
 └─────────────────────────────────────────────────────────────────┘
                               ▼
 ┌─────────────────────────────────────────────────────────────────┐