Fix subagent announce failover race (always emit lifecycle end + treat timeout=0 as no-timeout) (#6621)

* Fix subagent announce race and timeout handling

Bug 1: Subagent announce fires before model failover retries finish
- Problem: CLI provider emitted lifecycle error on each attempt, causing
  subagent registry to prematurely call beginSubagentCleanup() and announce
  with incorrect status before failover retries completed
- Fix: Removed lifecycle error emission from CLI provider's attempt-level
  .catch() in agent-runner-execution.ts. Errors still propagate to
  runWithModelFallback for retry, but no intermediate lifecycle events
  are emitted. Only the final outcome (after all retries) emits lifecycle
  events.

Bug 2: Hard 600s per-prompt timeout ignores runTimeoutSeconds=0
- Problem: When runTimeoutSeconds=0 (meaning 'no timeout'), the code
  returned the default 600s timeout instead of respecting the 0 setting
- Fix: Modified resolveAgentTimeoutMs() to treat 0 as 'no timeout' and
  return a very large timeout value (30 days) instead of the default.
  This avoids setTimeout issues with Infinity while effectively providing
  unlimited time for long-running tasks.

* fix: emit lifecycle:error for CLI failures (#6621) (thanks @tyler6204)

* chore: satisfy format/lint gates (#6621) (thanks @tyler6204)

* fix: restore build after upstream type changes (#6621) (thanks @tyler6204)

* test: fix createSystemPromptOverride tests to match new return type (#6621) (thanks @tyler6204)

src/agents/auth-profiles/oauth.ts

@@ -15,12 +15,10 @@ import { ensureAuthStoreFile, resolveAuthStorePath } from "./paths.js";
 import { suggestOAuthProfileIdForLegacyDefault } from "./repair.js";
 import { ensureAuthProfileStore, saveAuthProfileStore } from "./store.js";
 
-const OAUTH_PROVIDER_IDS = new Set<OAuthProvider>(
-  getOAuthProviders().map((provider) => provider.id),
-);
+const OAUTH_PROVIDER_IDS = new Set<string>(getOAuthProviders().map((provider) => provider.id));
 
 const isOAuthProvider = (provider: string): provider is OAuthProvider =>
-  OAUTH_PROVIDER_IDS.has(provider as OAuthProvider);
+  OAUTH_PROVIDER_IDS.has(provider);
 
 const resolveOAuthProvider = (provider: string): OAuthProvider | null =>
   isOAuthProvider(provider) ? provider : null;