fix(vector): separate write transport fields

harness/tht/adapters/vector/legacy_direct.py

@@ -2,7 +2,12 @@
 
 from sqlalchemy import Engine
 
-from tht.ports.vector import VectorCapabilities, VectorHealth, VectorRecord, VectorWriteUnavailable
+from tht.ports.vector import (
+    VectorCapabilities,
+    VectorHealth,
+    VectorWriteRecord,
+    VectorWriteUnavailable,
+)
 from tht.vectorstore.store import VectorHit, VectorStore as TableVectorStore
 
 
@@ -43,5 +48,5 @@ class LegacyDirectVectorStore:
     def existing_hashes(self, collection: str, kinds: list[str]) -> dict[str, str]:
         raise VectorWriteUnavailable("Legacy direct reader has no writer interface")
 
-    def upsert(self, collection: str, records: list[VectorRecord]) -> int:
+    def upsert(self, collection: str, records: list[VectorWriteRecord]) -> int:
         raise VectorWriteUnavailable("Legacy direct reader has no writer interface")