whoami always reports plan: null — Credentials.plan is never populated

[aakashrajput]

Bug

klaatai whoami (both --json and plain output) always reports plan: null / omits the Plan line, even when signed in and online. Confirmed on a real signed-in session:

$ klaatcode-test whoami --json
{
  "signedIn": true,
  "email": "user@example.com",
  "plan": null,
  "backend": "online"
}

Root cause

Credentials.plan (src/auth/credentials.ts:25) is never written by anything:

1. The OAuth browser-login callback (src/auth/browser.ts:166-172) only reads access_token, refresh_token, expires_in, user_id, email off the redirect URL — there's no plan query param, so it's never captured at login time.
2. runWhoami (src/auth/login.ts) calls client.ping(), which hits GET /health (src/api/client.ts:407-420) — a plain health-check endpoint, not per-user, so it can't return plan info either.
3. The only place the CLI does learn the live plan is X-KlaatAI-Quota-Plan on chat-completion responses (parseQuotaHeaders, src/api/client.ts:644-656), parsed per-request for the interactive session — but that value is never written back to credentials.json.

So plan is dead on arrival: nothing populates it for any user, ever. This isn't a one-off — every signed-in user gets plan: null from whoami.

Suggested fix

Either:

• Have the web OAuth callback page also pass plan as a redirect query param (server + website change), captured alongside email/user_id in browser.ts, and re-saved on token refresh (refresh.ts) since plan can change (upgrade/downgrade) — the stored value would still go stale between refreshes; or
• Have whoami hit an authenticated per-user endpoint that returns plan directly (e.g. extend /v1/me/usage or add a lightweight /v1/me profile route) instead of the generic /health ping, so it's always fresh rather than relying on a cached field.

The second option avoids the staleness problem of persisting a plan string that can change server-side without the CLI knowing.

Repro

klaatai whoami --json   # plan is always null, regardless of actual subscription