docs(provider): memory-plane v1 contract (basic plane) + ignore provider runtime DBs
- docs/contracts/bifrost_memory_provider.contract.md: v1 memory consumer spec —
SQLite+sqlite-vec basic plane (describe_store / search / get / upsert / delete),
honest capability advertisement (edges/atomic/transaction off, optimistic-lock on),
affect-reused replay-or-conflict idempotency, #195 parity gate. Memory is a
STRUCTURAL INDEX (reads vector/scope/id/origin), not a blind conduit (INV-001).
- .gitignore: *.db (+ wal/shm) — provider stores hold persisted agent affect/memory
state; never track them.
vh
eebab46812