fix(memory-lancedb): declare apache-arrow peer

extensions/AGENTS.md

@@ -31,6 +31,14 @@ third-party plugins see.
 - Do not use relative imports that escape the current extension package root.
 - Keep plugin metadata accurate in `openclaw.plugin.json` and the package
   `openclaw` block so discovery and setup work without executing plugin code.
+- Plugin runtime dependencies belong to the owning plugin package. If a plugin
+  dependency has a runtime peer, declare/provide it in that plugin's
+  `package.json`; do not move it to root unless root/package dist owns the
+  import. Runtime never installs deps; install/update/doctor are repair points.
+- Keep plugin dependency assertions in generic contracts
+  (`package-manifest.contract.test.ts`,
+  `extension-runtime-dependencies.contract.test.ts`) rather than plugin e2e
+  tests when they express package ownership.
 - Treat files like `src/**`, `onboard.ts`, and other local helpers as private
   unless you intentionally promote them through `api.ts` and, if needed, a
   matching `src/plugin-sdk/<id>.ts` facade.

extensions/memory-lancedb/package.json

@@ -9,6 +9,7 @@
   "type": "module",
   "dependencies": {
     "@lancedb/lancedb": "^0.27.2",
+    "apache-arrow": "18.1.0",
     "openai": "^6.35.0",
     "typebox": "1.1.37"
   },