verdict: READY
gaps: []

Notes:
- task_contract canvas is present and complete (version 1, mode: standard) with requirements, surfaces, invariants, risks, verification, and regression_plan all populated.
- contract_policy declares flow: full_spdd, sync_gate: required, verification_path: automated — meets full SPDD gating.
- All six acceptance criteria (AC-1..AC-6) are observable: each is keyed to a specific named pytest test invocation (e.g. `tests/test_knowledge_graph.py::TestTemporalValidation::test_add_triple_accepts_iso_dates_and_utc_datetimes`).
- Every AC has a matching verification row via acceptance_ids: AC-1→VER-1, AC-2→VER-2, AC-3→VER-3, AC-4→VER-4, AC-5→VER-5, AC-6→VER-6. All verification commands are concrete shell pytest invocations, not prose placeholders.
- regression_plan.applies: true, with REG-1 (KG temporal/queries/invalidation/timeline), REG-2 (MCP KG handlers + registry/schema), REG-3 (export round-trip). All ACs are linked to at least one regression check (AC-1→REG-1,REG-3; AC-2→REG-1; AC-3→REG-1; AC-4→REG-1,REG-3; AC-5→REG-2; AC-6→REG-2). All regression commands are runnable pytest invocations.
- Files list (`mempalace_code/knowledge_graph.py`, `mempalace_code/mcp/tools/kg.py`, `tests/test_knowledge_graph.py`, `tests/test_mcp_server.py`) matches the implementation surface implied by the requirements; existing referenced classes/fixtures (TestKGTools at test_mcp_server.py:550, TestExportWithKG at test_export.py:162) exist in the repo.
- No backlog metadata, archive files, or BACKLOG.yaml appear in touched_files/surfaces.
- Out-of-scope section excludes schema migration, export/import format changes, and natural-language date parsing — consistent with the data-integrity intent.
- Risks (RISK-1..RISK-4) explicitly cover the temporal-comparison correctness concern (string compare vs parsed compare), the invalidate-before-mutation ordering, the MCP arg-forwarding regression, and the strict-parsing format risk; each carries a concrete mitigation.
- Design notes correctly identify that existing as_of SQL filtering must keep inclusive semantics (INV-3) and that NULL means unbounded (INV-2) — both invariants are linked back to the test surface.
