dangernoodle-io / TaipanMiner / 26701686737

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feat(mining): per-board unicore yield mask (CONFIG_MINING_UNICORE_YIELD_MASK) (#463)

- replaces the hardcoded 0x3FFF unicore yield_mask in mining.c with
  CONFIG_MINING_UNICORE_YIELD_MASK (Kconfig, default 0x3FFF, depends on
  FREERTOS_UNICORE) so single-core boards can tune yield cadence
- sets esp32-c3-supermini and esp32-s2-mini to 0x1FFF (yield every 8K nonces)
- s2: 0x1FFF is the knee — hashrate plateaus (~247 kH/s) and HTTP latency is
  best here; sparser masks add <1% throughput but explode latency (0xFFFF:
  p90 1507ms vs 66ms at 0x1FFF)
- c3: hashrate is mask-insensitive in the 0x1FFF-0xFFFF range (~312 kH/s once
  thermally settled); 0x1FFF chosen for parity with the s2 + marginally tighter
  latency. methodology caveat: a 90s post-flash settle under-reads c3
  hashrate_1m (the rolling avg is still filling) — values picked on latency
- dual-core boards unchanged (0x3FFFF)
- validated on-device: c3 (172.16.1.110) + s2 (172.16.1.107), rejected=0

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

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