Add pluggable memory embedder adapter and vector metadata

test/memory-embedder.test.mjs

@@ -0,0 +1,39 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+
+import { createEmbedderAdapter, embedText } from '../src/services/memory/embedder.js';
+
+test('createEmbedderAdapter selects in-memory backend and supports vector CRUD', async () => {
+  const adapter = createEmbedderAdapter({ backend: 'inmemory' });
+  const vector = await adapter.embedText('hello world');
+
+  await adapter.upsertVector({
+    id: 'vec-1',
+    vector,
+    metadata: { agent_id: 'a1', context_excerpt: 'hello world' },
+  });
+
+  const results = await adapter.queryVector({
+    vector,
+    k: 1,
+    filter: { agent_id: 'a1' },
+  });
+
+  assert.equal(results.length, 1);
+  assert.equal(results[0].id, 'vec-1');
+  assert.equal(results[0].metadata.context_excerpt, 'hello world');
+
+  const deleted = await adapter.deleteVector('vec-1');
+  assert.equal(deleted, true);
+});
+
+test('createEmbedderAdapter reads backend from environment', async () => {
+  process.env.MEMORY_VECTOR_BACKEND = 'local';
+  const adapter = createEmbedderAdapter();
+  const vector = await embedText('env selected', { adapter });
+
+  assert.ok(Array.isArray(vector));
+  assert.ok(vector.length > 0);
+
+  delete process.env.MEMORY_VECTOR_BACKEND;
+});