dangernoodle-io / TaipanMiner / 25342540428

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refactor(mining): extract mining_pool_eff_tick — single source of period math (#336)

- Consolidates duplicate pool-effective rolling-window logic from two timer
  callbacks (mining.c::hw_avg_timer_cb, asic_task.c 5s poll). The 5s period
  is now an explicit parameter; both sites pass (ASIC_POLL_PERIOD_MS / 1000.0)
  and 5.0 respectively — the math is unified and single-source.
- Adds mining_pool_eff_tick(double sum, double period_s, ...) in mining_avg.c:
  computes delta, clamps on pool-reconnect, applies rate formula, feeds through
  mining_avg_update. Caller retains all module-static buffers and state.
- Three new tests: zero-delta, constant-rate steady-state, sum-decrease clamp.

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

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