Avatar Customization + Update Agent Brain (#23)

Co-authored-by: iamlukethedev <iamlukethedev@users.noreply.github.com>

tests/unit/agentFleetHydrationDerivation.test.ts

@@ -1,6 +1,7 @@
 import { describe, expect, it } from "vitest";
 
 import { deriveHydrateAgentFleetResult } from "@/features/agents/operations/agentFleetHydrationDerivation";
+import { createDefaultAgentAvatarProfile } from "@/lib/avatars/profile";
 import type { StudioSettings } from "@/lib/studio/settings";
 
 describe("deriveHydrateAgentFleetResult", () => {
@@ -13,12 +14,13 @@ describe("deriveHydrateAgentFleetResult", () => {
       focused: {},
       avatars: {
         [gatewayUrl]: {
-          "agent-1": "persisted-seed",
+          "agent-1": createDefaultAgentAvatarProfile("persisted-seed"),
         },
       },
       deskAssignments: {},
       analytics: {},
       voiceReplies: {},
+      office: {},
     };
 
     const result = deriveHydrateAgentFleetResult({
@@ -93,6 +95,7 @@ describe("deriveHydrateAgentFleetResult", () => {
         name: "One",
         sessionKey: "agent:agent-1:main",
         avatarSeed: "persisted-seed",
+        avatarProfile: expect.objectContaining({ seed: "persisted-seed" }),
         avatarUrl: "https://example.com/one.png",
         model: "openai/gpt-4.1",
         thinkingLevel: "medium",