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/tests/test_evidence_facade_contract.py

@@ -97,6 +97,7 @@ def test_source_factory_preserves_legacy_first_order_and_filesystem_configuratio
     (legacy_root / "evidence").mkdir(parents=True)
     configured_root.mkdir()
     cfg = SimpleNamespace(evidence=SimpleNamespace(
+        local_archive_root=None,
         source_root=legacy_root,
         evidence_dir="evidence",
         sources=[SimpleNamespace(
@@ -124,6 +125,7 @@ def test_legacy_source_discovers_only_curated_evidence_units(tmp_path):
     (legacy_root / "evidence" / "curated" / "domain").mkdir(parents=True)
     (legacy_root / "evidence" / "curated" / "domain" / "patient.md").write_text("curated")
     cfg = SimpleNamespace(evidence=SimpleNamespace(
+        local_archive_root=None,
         source_root=legacy_root,
         evidence_dir="evidence",
         sources=[],