fix(evidence): enforce active vector generations

harness/tht/adapters/vector/legacy_direct.py

@@ -5,6 +5,7 @@ from sqlalchemy import Engine
 from tht.ports.vector import (
     VectorCapabilities,
     VectorHealth,
+    VectorStoreError,
     VectorWriteRecord,
     VectorWriteUnavailable,
     require_positive_limit,
@@ -49,8 +50,11 @@ class LegacyDirectVectorStore:
         *,
         limit: int,
         kinds: list[str] | None = None,
+        metadata_filter: dict[str, object] | None = None,
     ) -> list[VectorHit]:
         require_positive_limit(limit)
+        if metadata_filter is not None:
+            raise VectorStoreError("Legacy vector store cannot enforce metadata filtering")
         hits: list[VectorHit] = []
         for collection in collections:
             table = TableVectorStore(