dangernoodle-io / TaipanMiner / 24117166999

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fix: harden mining against share flooding after OTA check (#64)

- replace vTaskSuspend/Resume with cooperative pause (semaphore handshake)
- acquire ESP-IDF SHA peripheral lock (esp_crypto_sha_aes_lock) so mbedTLS
  TLS operations cannot clock-gate the SHA peripheral while mining holds it
- release SHA lock at yield points so mbedTLS can use HW SHA during pause
- add is_target_valid() guard at work queue read and build_work write time
- add share sanity check (difficulty >= 0.001, valid target, share >= 0.5x pool)
- clamp difficulty_to_target for NaN/Inf/negative/tiny inputs
- revert stack to 8192 (2960 bytes peak usage, 5232 headroom)

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

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