Phase 3: Cascade LLM Router with automatic failover

- YAML-based provider configuration (config/providers.yaml)
- Priority-ordered provider routing
- Circuit breaker pattern for failing providers
- Health check and availability monitoring
- Metrics tracking (latency, errors, success rates)
- Support for Ollama, OpenAI, Anthropic, AirLLM providers
- Automatic failover on rate limits or errors
- REST API endpoints for monitoring and control
- 41 comprehensive tests

API Endpoints:
- POST /api/v1/router/complete - Chat completion with failover
- GET /api/v1/router/status - Provider health status
- GET /api/v1/router/metrics - Detailed metrics
- GET /api/v1/router/providers - List all providers
- POST /api/v1/router/providers/{name}/control - Enable/disable/reset
- POST /api/v1/router/health-check - Run health checks
- GET /api/v1/router/config - View configuration

data/self_modify_reports/20260226_002427_add_docstring.md

@@ -0,0 +1,31 @@
+# Self-Modify Report: 20260226_002427
+
+**Instruction:** Add docstring
+**Target files:** src/foo.py
+**Dry run:** False
+**Backend:** ollama
+**Branch:** N/A
+**Result:** SUCCESS
+**Error:** none
+**Commit:** abc12345
+**Attempts:** 1
+**Autonomous cycles:** 0
+
+## Attempt 1 -- complete
+
+### LLM Response
+```
+llm raw
+```
+
+### Edits Written
+#### src/foo.py
+```python
+x = 1
+
+```
+
+### Test Result: PASSED
+```
+5 passed
+```