feat(cli): roamcode status — service, reachability, and running build at a glance

[dchaudhari7177]

Closes #69

What

New roamcode status subcommand (packages/cli/src/status.ts, lazily imported like install so the serve path stays lean):

1. Service: reads <dataDir>/service.json via the server's own resolveDataDir (so it sees exactly what roamcode install wrote) and prints Service: <manager> · <label>, or none installed, with a roamcode install hint — and still probes the port in that case.
2. Reachability: GET http://127.0.0.1:<PORT>/health (PORT env when it's a usable positive integer, else 4280 — PORT=0 means "pick a free port" at serve time, so status falls back to the default) with a 2s AbortSignal.timeout. Exit 0 when reachable, 1 when not, so scripts can roamcode status && ….
3. Build info (best-effort): /version is token-gated, so when a token is available (ACCESS_TOKEN env wins, else the persisted <dataDir>/token — same precedence as the server) the output becomes running at … (v0.4.2 · abc1234). No token / 401 / timeout quietly degrades to plain running — never contradicting the /health answer already in hand.

args.ts accepts the leading status positional (same pattern as install/uninstall) and the help text gains a line.

Tests

packages/cli/test/status.test.ts follows the existing deps-injection style (injected fetchFn + in-memory readFile, no real network or data dir): not-installed+unreachable→exit 1, installed+up+token→full detail line, no-token→/version never fetched, stale-token 401→plain running, PORT env + ACCESS_TOKEN-beats-file precedence, PORT=0→default 4280, corrupt service.json tolerated. Plus a status parse case in args.test.ts.

Verification

• pnpm typecheck green; vitest run packages/cli — all 31 status/args/run tests that pass on main still pass plus the 8 new ones (the 4 pre-existing install failures on a Windows checkout — backslash join() paths and chmod-mode asserts — are unchanged and don't occur on Linux CI).
• Smoke-ran the real CLI: with nothing listening → Service: none installed… / Server: not reachable at http://127.0.0.1:4280, exit 1. Against a stub /health+/version server with ACCESS_TOKEN set → Server: running at http://127.0.0.1:4280 (v0.9.9 · cafe123), exit 0.