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fix(mining): D0 SHA digest byte order via shared mining_hash_from_state helper (#333)

Three independent serialization paths (SW sha256.c, AHB sha256_hw_ahb /
mining.c, DPORT sha256_hw_dport.c) each produced the 32-byte hash[] for
meets_target. DPORT used LE-per-word while SW/AHB used BE-per-word — pool
rejected DPORT shares as low_difficulty (empirically confirmed).

Introduces mining_hash_from_state(state[8], hash_out[32]) in work.h/work.c as
the single serialization point: canonical SHA-256 state words stored big-endian
into the output buffer. All three production paths and both self-test abc-vector
serializations now route through it, preventing format drift from recurring.

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

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