**3 issues found** across 7 files

Prompt for AI agents (unresolved issues)

```text Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately. P2: `sleepSync` burns 100% CPU while spinning. Use `Atomics.wait` for a zero-CPU synchronous sleep — it's available in all supported Node versions (≥20). P1: The auto-migration write inside `resolveApiKeyAsync` still mutates `creds` in-place and calls `writeCredentials` without `withFileLock`, leaving the same lost-update race this PR eliminates everywhere else. Wrap the write in `withFileLock` and use immutable updates to match the other mutators. P2: This change still allows an uncaught credentials-read throw via `resolveProfileName()`, so logout can crash on corrupted credentials instead of reaching the `remove_failed` handling path. ```

_{Reply with feedback, questions, or to request a fix. Tag `@cubic-dev-ai` to re-run a review, or [fix all with cubic](https://www.cubic.dev/action/fix/pr/resend/resend-cli/244/ai_pr_review_1775765578260_a6684bea-40c7-416d-8b07-b8b2ac89ffb1?entrySource=github_ui_to_cubic_ui).}