Document chunks not stored in vector store (#665)

- Schema - ChunkEmbeddings now uses chunk_id: str instead of chunk: bytes
- Schema - DocumentEmbeddingsResponse now returns chunk_ids: list[str]
  instead of chunks
- Translators - Updated to serialize/deserialize chunk_id
- Clients - DocumentEmbeddingsClient.query() returns chunk_ids
- SDK/API - flow.py, socket_client.py, bulk_client.py updated
- Document embeddings service - Stores chunk_id (document ID) instead
  of chunk text
- Storage writers - Qdrant, Milvus, Pinecone store chunk_id in payload
- Query services - Return chunk_id from vector store searches
- Gateway dispatchers - Serialize chunk_id in API responses
- Document RAG - Added librarian client to fetch chunk content from
  Garage using chunk_ids
- CLI tools - Updated all three tools:
  - invoke_document_embeddings.py - displays chunk_ids, removed
    max_chunk_length
  - save_doc_embeds.py - exports chunk_id
  - load_doc_embeds.py - imports chunk_id

trustgraph-base/trustgraph/base/document_embeddings_client.py

@@ -27,7 +27,7 @@ class DocumentEmbeddingsClient(RequestResponse):
         if resp.error:
             raise RuntimeError(resp.error.message)
 
-        return resp.chunks
+        return resp.chunk_ids
 
 class DocumentEmbeddingsClientSpec(RequestResponseSpec):
     def __init__(

trustgraph-base/trustgraph/base/document_embeddings_query_service.py

@@ -57,7 +57,7 @@ class DocumentEmbeddingsQueryService(FlowProcessor):
             docs = await self.query_document_embeddings(request)
 
             logger.debug("Sending document embeddings query response...")
-            r = DocumentEmbeddingsResponse(chunks=docs, error=None)
+            r = DocumentEmbeddingsResponse(chunk_ids=docs, error=None)
             await flow("response").send(r, properties={"id": id})
 
             logger.debug("Document embeddings query request completed")
@@ -73,7 +73,7 @@ class DocumentEmbeddingsQueryService(FlowProcessor):
                     type = "document-embeddings-query-error",
                     message = str(e),
                 ),
-                chunks=None,
+                chunk_ids=[],
             )
 
             await flow("response").send(r, properties={"id": id})