**Summary**
This change introduces a new startup check that notifies users if a
newer `@openai/codex` version is available. To avoid spamming, it writes
a small state file recording the last check time and will only re‑check
once every 24 hours.
**What’s Changed**
- **New file** `src/utils/check-updates.ts`
- Runs `npm outdated --global @openai/codex`
- Reads/writes `codex-state.json` under `CONFIG_DIR`
- Limits checks to once per day (`UPDATE_CHECK_FREQUENCY = 24h`)
- Uses `boxen` for a styled alert and `which` to locate the npm binary
- **Hooked into** `src/cli.tsx` entrypoint:
```ts
import { checkForUpdates } from "./utils/check-updates";
// …
// after loading config
await checkForUpdates().catch();
```
- **Dependencies**
- Added `boxen@^8.0.1`, `which@^5.0.0`, `@types/which@^3.0.4`
- **Tests**
- Vitest suite under `tests/check-updates.test.ts`
- Snapshot in `__snapshots__/check-updates.test.ts.snap`
**Motivation**
Addresses issue #244. Users running a stale global install will now see
a friendly reminder—at most once per day—to upgrade and enjoy the latest
features.
**Test Plan**
- `getNPMCommandPath()` resolves npm correctly
- `checkOutdated()` parses `npm outdated` JSON
- State file prevents repeat alerts within 24h
- Boxen snapshot matches expected output
- No console output when state indicates a recent check
**Related Issue**
try resolves#244
**Preview**
Prompt a pnpm‑style alert when outdated
Let me know if you’d tweak any of the messaging, throttle frequency,
placement in the startup flow, or anything else.
---------
Co-authored-by: Thibault Sottiaux <tibo@openai.com>
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