fix(memory): add input_type to Voyage AI embeddings for improved retrieval (#10818)

* fix(memory): add input_type to Voyage AI embeddings for improved retrieval

Voyage AI recommends passing input_type='document' when indexing and
input_type='query' when searching. This improves retrieval quality by
optimising the embedding space for each direction.

Changes:
- embedQuery now passes input_type: 'query'
- embedBatch now passes input_type: 'document'
- Batch API request_params includes input_type: 'document'
- Tests updated to verify input_type is passed correctly

* Changelog: note Voyage embeddings input_type fix (#10818) (thanks @mcinteerj)

---------

Co-authored-by: Tak Hoffman <781889+Takhoffman@users.noreply.github.com>

src/memory/batch-voyage.ts

@@ -1,8 +1,7 @@
 import { createInterface } from "node:readline";
 import { Readable } from "node:stream";
-
-import { retryAsync } from "../infra/retry.js";
 import type { VoyageEmbeddingClient } from "./embeddings-voyage.js";
+import { retryAsync } from "../infra/retry.js";
 import { hashText, runWithConcurrency } from "./internal.js";
 
 /**
@@ -110,6 +109,7 @@ async function submitVoyageBatch(params: {
           completion_window: VOYAGE_BATCH_COMPLETION_WINDOW,
           request_params: {
             model: params.client.model,
+            input_type: "document",
           },
           metadata: {
             source: "clawdbot-memory",