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test(asic): extract rolling-window metric averaging (TA-234) (#190)

third target of the TA-234 seam-for-testability pass. asic_task's
NaN-safe progressive-blend averaging (1m/10m/1h windows for
asic_total_ghs and asic_hw_error_pct, TA-196) was buried in
asic_task.c with a global poll_count read. extract:

- asic_metric_avg_nan_safe(buf, n) — pure NaN-tolerant mean
- asic_metric_avg_update(poll_count, sample, ...) — one ring-buffer
  step with progressive blend toward the longer windows

asic_task.c keeps its statics; just calls the helper. ~12 host tests
cover empty/partial-NaN means, warmup, full-window cycles, ring
wraparound, and the 10m/1h blend formulas. use NaN self-inequality
check (x != x) to avoid isnanf portability on macOS clang.

no behavior change. brings asic_task.c closer to a pure-orchestration
shape — next pass can target the chip_idx / nonce-routing math.

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

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