dangernoodle-io / TaipanMiner / 26670276352

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fix(mining): drop all-zero hashes and scrub corrupt persisted stats (#452)

- add s_hash_is_all_zero() guard in mine_nonce_range: all-zero sha256d
  output is physically impossible; on classic-esp32 (d0) it is the
  dport cross-bus erratum artifact. drop such hashes before they can
  update best_diff or fire false block detections
- add LIFETIME_BLOCKS_SANE_MAX (1024) sentinel to mining_pool_stats:
  rejects implausible lifetime_blocks_total and per-slot blocks_found
  values that accumulated from false record_block() calls driven by the
  zero-hash erratum (wroom32 symptom: lifetime_blocks_total ≈ 23358)
- add best_diff >= 1e15 guard: the zero-hash clamp value from
  hash_to_difficulty() is a reliable corruption marker; reset to 0
- add four host tests covering the new sanitizer paths; update two
  existing tests whose expectations changed under the new ceiling

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

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