feat: add live traffic learning + cross-agent memory writers (--learn flag)

Slim core dependencies: 2.5GB → 195MB install size

fix: harden edge cases, expand tool exclusions, and fix mypy errors

Add Memory Bridge: bidirectional sync between markdown files and Headroom memory

Fix CI: guard starlette imports, asyncio.run(), deprecate datetime.utcnow()

Fix security vulnerabilities in memory and CCR systems

Add centralized ML model configuration

Add centralized MLModelRegistry to share ML model instances

Add SQLite vector backend as default and fix HNSW test skipping

Add SQLiteVectorIndex using sqlite-vec for bounded vector search

Add bounded memory support to HNSWVectorIndex with LRU eviction

Add SQLiteGraphStore for bounded, persistent graph storage

Add memory observability system (Phase 1)

Add multi-provider memory system with auto-detection

fix(memory): use subprocess probe to avoid hnswlib SIGILL crash on CI

Add DiffCompressor and fix hnswlib SIGILL crash on CI

Fix mypy errors and add network timeout handler for flaky CI tests

fix: resolve mypy type errors

fix: improve error handling and add comprehensive test coverage

fix: resolve mypy type errors across codebase

Add hierarchical memory system with graph + vector storage

Make hnswlib optional and skip tests when unavailable

Replace legacy memory system with HierarchicalMemory

Add persistent memory system with zero-latency inline extraction