v0.1.0 — Core Memory System

Added

• Core persistent memory system: Markdown files as the source of truth, SQLite as
  a derived index, Git for versioning.
• Hybrid search — FTS5 keyword matching + sqlite-vec vector similarity merged
  via Reciprocal Rank Fusion, with local embeddings (no API calls).
• Knowledge graph — structured knowledge types with sequential IDs,
  bidirectional connections, hierarchical namespace tags, and connection discovery.
• Git versioning via isomorphic-git with semantic commit messages.
• Consolidation of session notes into knowledge files (heuristic, no LLM).
• Decay — archive-candidate detection based on access patterns.
• Migrations — split-files, namespace-tags, discover-connections.
• CLI (agent-memory) and a programmatic API (createMemorySystem()).
• Per-project and optional global memory stores.