dangernoodle-io / TaipanMiner / 25242514458

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fix(mining): acquire SHA periph clock + lock for AHB self-test (TA-333) (#298)

sha256_hw_ahb_self_test wrote to SHA peripheral registers via
sha256_hw_midstate without first acquiring the AES/SHA lock or enabling
the periph clock. on ESP32-S3 the AHB writes were silently dropped,
leaving the system in undefined state and triggering downstream heap /
event-pool exhaustion that panicked the mining task at uptime ~5s.

- wrap the midstate call in sha256_hw_acquire / sha256_hw_release so the
  clock is on and the lock is held while the peripheral is touched
- bench-verified on tdongle-s3 (S3 AHB path); 220 kH/s stable with
  shares accepted; no panic, no event-pool cascade

regression introduced by TA-322 (cce352a); v0.17.0 unaffected.

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

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