feat: implement memory and evidence administration with guided repairs

Add PostgreSQL-backed memory, editable evidence with source review and activation, and human-approved archive repairs across the harness, API, and UI. Include migrations, deployment support, regression coverage, and validation documentation.

Refresh permissions from validated session roles so existing administrator logins can access newly deployed archive management features.

harness/tht/ports/vector.py

@@ -88,6 +88,10 @@ class VectorStore(Protocol):
 
     def delete_kinds(self, collection: str, kinds: list[str]) -> int: ...
 
+    def prepare_memory_index(self) -> None: ...
+
+    def delete_memory_records(self, record_keys: list[str]) -> None: ...
+
     def delete_generation(self, collection: str, generation: str, workspace_id: str) -> int: ...
 
     def list_evidence_generations(self, collection: str, workspace_id: str) -> list[str]: ...