docs(provider): memory contract v1.1 — heid-contract-review fixup
Panel review (Gróa/Hulda/Regin) → 11 spec-tightening fixes, no design change:
- INV-001 byte-equal → semantic round-trip (the slip that rode the affect copy-paste)
- search returns top_k IN-SCOPE results (filter-then-limit) — Regin's correctness catch
- idempotency_id reconciled to the reference's ("default", verb, actor, key)
- inline the reference's field keys (id/embedding/scope/distillate) + recalled_view + scope_filter shape
- drop scan from INV-005; clarify metadata_filter-v1 reject, transaction-term, delete atomicity, get_many, revision-on-replay
- revisions: marker records the v1.1 delta
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