feat: auth commands: login, status, logout and token under auth

[alukach]

Stacked on #45 (foundation). Supersedes #40 (auth status), #41 (auth logout), the auth login move from #24, and auth status --json from #44.

What

Signing in lives under auth:

• auth login: the browser login. The top-level login keeps working as a hidden command, so scripts and habits don't break. It records:
  • the account, looked up through /whoami at --api-url / SOURCE_API_URL;
  • when the refresh token was issued.
• auth status: environment, login state, account and profile link, each token's expiry, and the role's cached credentials.
  • Refresh token: renewed <time> (<ago>); expires <day> (in N days). Ory's refresh tokens are opaque and its token response gives no lifetime (verified: only access_token, expires_in, id_token, refresh_token, scope, token_type).
  • The expiry is an estimate: last renewal plus 30 days, Ory's default, overridable with SOURCE_REFRESH_TOKEN_LIFETIME. That setting only affects the display; nothing sent at login depends on it.
  • --json: the same as data, including profile_url, estimated_lapse_at and assumed_lifetime.
• auth logout: removes an environment's login session and a role's cached credentials.
• auth token: prints the API access token, as before.
• Hints now say source-coop auth login.

Testing

• cargo test and cargo test --features staging: 64 passed. Covers status rows and JSON, the lifetime estimate and override, relative times, login still working by its old name, the account coming from /whoami, logout's file removal, and refresh tracking through rotation.
• cargo clippy --all-targets -- -D warnings (both builds): clean.
• Manual: auth status and --json against a file-cached session in a temporary HOME, so no keychain entry was read.

🤖 Generated with Claude Code

[claude]

Claude finished @alukach's task in 25s —— View job

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✅ No blocking issues — safe to merge.

I read the full diff (HEAD~6..HEAD; origin/main...HEAD has no merge base in this checkout). I didn't build or run the tests.

• Logout deletes the keyring entry and the file copy under the slot lock, and removes the file even when the keyring errors.
• write_file now creates the cache file with mode 0600 before any bytes are written.
• auth status uses peek_credentials, so it writes nothing.
• Zero or negative refresh lifetimes are dropped in oidc.rs.
• The login /whoami lookup has a 10s timeout and a failed lookup is non-fatal.

Non-blocking notes:

• src/main.rs (run_login): the account lookup goes to site(&session), which is the token audience (falling back to defaults::API_URL), not --api-url. LoginArgs has no api_url. The PR description says the lookup uses --api-url / SOURCE_API_URL, and .env.staging now exports SOURCE_API_URL. For a local API (http://localhost:3000) with the default audience, the lookup goes to production. Either fix the description or take --api-url on login.
• src/main.rs (status_json): logged_in is true for likely_expired, so scripts that read it alone are told you're logged in on a lapsed estimate. This looks deliberate, since the state is exposed in login.state. A line in the README would help scripts.

Simplify (ponytail)

• src/main.rs login_state returns &'static str that callers re-match on strings ("expired", "likely_expired"). A small enum would drop the stringly-typed matching. The status_json state field can be built from it.
• src/main.rs status_report and status_json each take 6–7 positional parameters with a repeated (secs, label) tuple. A small struct passed by reference would replace them.
• src/cache.rs find_credentials(.., migrate: bool) is a bool flag with two wrappers. Fine as is, but peek_credentials could skip the migration check instead if legacy slots are rare.

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💰 Estimated review cost: $0.18 · 0m25s · 9 turns