fix(vector): separate write transport fields

harness/tht/ports/vector.py

@@ -20,6 +20,15 @@ class VectorHealth:
     detail: str | None = None
 
 
+@dataclass(frozen=True)
+class VectorWriteRecord:
+    """A canonical record plus transport-neutral, precomputed vector data."""
+
+    record: VectorRecord
+    embedding: list[float]
+    content_hash: str
+
+
 class VectorStoreError(Exception):
     """Base error exposed by vector adapters."""
 
@@ -46,7 +55,7 @@ class VectorStore(Protocol):
 
     def existing_hashes(self, collection: str, kinds: list[str]) -> dict[str, str]: ...
 
-    def upsert(self, collection: str, records: list[VectorRecord]) -> int: ...
+    def upsert(self, collection: str, records: list[VectorWriteRecord]) -> int: ...
 
 
 __all__ = [
@@ -56,5 +65,6 @@ __all__ = [
     "VectorRecord",
     "VectorStore",
     "VectorStoreError",
+    "VectorWriteRecord",
     "VectorWriteUnavailable",
 ]