Implement refinement hardening workplan

tests/test_file_backed_runtime.py

@@ -87,6 +87,44 @@ def test_repair_diagnostics_report_missing_edges_and_orphaned_path_events(tmp_pa
     assert [diagnostic["code"] for diagnostic in envelope["diagnostics"]] == ["missing_edge_target", "orphaned_path_event"]
 
 
+def test_file_backed_store_reports_migration_needs_and_uses_atomic_json_writes(tmp_path) -> None:
+    store = FileBackedMemoryGraphStore(tmp_path)
+    metadata_path = tmp_path / "phase-memory.json"
+    metadata_path.write_text(
+        json.dumps(
+            {
+                "schema_version": "phase_memory.local_store.v0",
+                "planned_migrations": ["v0-to-v1"],
+            }
+        ),
+        encoding="utf-8",
+    )
+
+    store.save_node(MemoryNode("node.atomic", "decision", "Atomic write target"))
+    runtime = PhaseMemoryRuntime(graph_store=store, event_log=JsonlMemoryEventLog(tmp_path / "events.jsonl"))
+
+    envelope = runtime.repair_diagnostics(source_ref=str(tmp_path))
+
+    codes = [diagnostic["code"] for diagnostic in envelope["diagnostics"]]
+    assert envelope["valid"] is True
+    assert "store_migration_required" in codes
+    assert "planned_store_migrations" in codes
+    assert not list(tmp_path.rglob("*.tmp"))
+
+
+def test_repair_diagnostics_distinguish_corrupt_store_records(tmp_path) -> None:
+    store = FileBackedMemoryGraphStore(tmp_path)
+    runtime = PhaseMemoryRuntime(graph_store=store, event_log=JsonlMemoryEventLog(tmp_path / "events.jsonl"))
+
+    (tmp_path / "nodes" / "broken.json").write_text("{not-json}\n", encoding="utf-8")
+
+    envelope = runtime.repair_diagnostics(source_ref=str(tmp_path))
+
+    assert envelope["valid"] is False
+    assert envelope["diagnostics"][0]["code"] == "corrupt_store_record"
+    assert envelope["diagnostics"][0]["metadata"]["record_type"] == "node"
+
+
 def test_lifecycle_apply_requires_approval_for_reviewable_actions(tmp_path) -> None:
     store = FileBackedMemoryGraphStore(tmp_path)
     runtime = PhaseMemoryRuntime(graph_store=store, event_log=JsonlMemoryEventLog(tmp_path / "events.jsonl"))