GET /api/tally/clock

Anonymous-safe.

Response — 200

{
  "ok": true,
  "f_hz": 1.287,
  "tau_s": 0.777,
  "alpha": 0.00129,
  "zeqond": "2287439213",
  "phase": 0.412,
  "unix": 1777345910.0
}

Mirrors GET /api/zeq/pulse but from the tally subsystem's own clock loop. Should agree to ≤1 ms.