Stop persisting agent prompt as the backend title

config.title is now strictly the caller's creation intent and is never
mutated. The prompt-derived placeholder lives only in record.title at
creation, so the metadata generator's upfront gate (hasExplicitTitle) is
the only one and writes unconditionally when it runs. Drops the two
projection fallbacks to record.config.title that were the second
hidden path for the prompt to surface as a title.

packages/app/e2e/helpers/terminal-perf.ts

@@ -30,6 +30,10 @@ export interface TerminalPerfDaemonClient {
     featureValues?: Record<string, unknown>;
     initialPrompt?: string;
   }): Promise<{ id: string; status: string }>;
+  fetchAgents(options?: { scope?: "active" }): Promise<{
+    entries: Array<{ agent: { id: string; cwd: string; title?: string | null } }>;
+  }>;
+  updateAgent(agentId: string, updates: { name?: string }): Promise<void>;
   waitForAgentUpsert(
     agentId: string,
     predicate: (snapshot: { status: string }) => boolean,