dangernoodle-io / TaipanMiner / 25148043461

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feat: pool latency measurement (TA-118) (#271)

Measure stratum round-trip time on active pool connection and expose via
/api/pool.latency_ms (rounded ms, integer). Uses exponential moving average
(EMA) for stable readings.

Track inflight request send-times indexed by JSON-RPC id (modulo 32 for
collisions). On response, compute RTT and update EMA with 7/8 old + 1/8 new.
Reset state on connection and apply 0-30s sanity bound.

Files changed:
- stratum_io.c: add inflight send-time array, record send-time in
  stratum_request(), compute RTT on response, reset on reconnect
- stratum.h: add stratum_get_pool_rtt_ms() getter (returns -1 if no sample)
- routes_json.h: add latency_ms field to pool_snapshot_t
- routes.c: populate latency_ms in /api/pool handler
- routes_json.c: emit latency_ms in JSON (null if -1)
- test_routes_json.c: update existing tests, add test_pool_latency_positive
  and test_pool_latency_negative

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

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