Implement live-shaped readiness workplan

tests/test_public_api.py

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+import json
+from pathlib import Path
+
+import phase_memory
+from phase_memory.service import LocalServiceRunner, SERVICE_OPERATIONS, service_contracts
+
+
+FIXTURES = Path(__file__).parent / "fixtures"
+
+
+def test_public_api_snapshot_is_explicit() -> None:
+    snapshot = json.loads((FIXTURES / "public-api-snapshot.json").read_text(encoding="utf-8"))
+
+    assert sorted(phase_memory.__all__) == snapshot["exports"]
+    assert sorted(SERVICE_OPERATIONS) == snapshot["service_operations"]
+
+
+def test_service_contract_catalog_matches_local_runner_supported_operations() -> None:
+    declared = set(service_contracts()["operations"])
+
+    assert set(LocalServiceRunner.supported_operations()) == declared