feat(gateway): add agents.create/update/delete methods (#11045)

* feat(gateway): add agents.create/update/delete methods

* fix(lint): preserve memory-lancedb load error cause

* feat(gateway): trash agent files on agents.delete

* chore(protocol): regenerate Swift gateway models

* fix(gateway): stabilize agents.create dirs and agentDir

* feat(gateway): support avatar in agents.create

* fix: prep agents.create/update/delete handlers (#11045) (thanks @advaitpaliwal)

- Reuse movePathToTrash from browser/trash.ts (has ~/.Trash fallback on non-macOS)
- Fix partial-failure: workspace setup now runs before config write
- Always write Name to IDENTITY.md regardless of emoji/avatar
- Add unit tests for agents.create, agents.update, agents.delete
- Add CHANGELOG entry

---------

Co-authored-by: Tyler Yust <TYTYYUST@YAHOO.COM>

extensions/memory-lancedb/index.ts

@@ -32,7 +32,7 @@ const loadLanceDB = async (): Promise<typeof import("@lancedb/lancedb")> => {
     return await lancedbImportPromise;
   } catch (err) {
     // Common on macOS today: upstream package may not ship darwin native bindings.
-    throw new Error(`memory-lancedb: failed to load LanceDB. ${String(err)}`);
+    throw new Error(`memory-lancedb: failed to load LanceDB. ${String(err)}`, { cause: err });
   }
 };