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test(mining): SW-vs-HW lockstep self-test for D0 SHA hot loop (#332)

The AHB (S3) path already had a lockstep self-test; the D0 DPORT path
was missing one. WROOM-32 is now submitting shares at low pool diff (PR
#330) but pool rejects them all as low_difficulty — strong evidence of a
D0 digest bug that the old early-reject was masking.

Adds sha256_hw_dport_self_test_lockstep(): 1000 nonces from a fixed
start, each comparing sha256d(header, 80) SW output against
sha256_hw_dport_per_nonce() HW output. On mismatch, logs the first
diverging byte plus 7-byte context (HW vs SW) so the failing byte
position is visible in the boot log without a 32-byte hex dump. Wired
into sha256_hw_dport_boot_probes(), called from mining_run_self_tests()
before the microbench under the existing SHA lock.

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

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