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perf(mining): restore D0 early-reject on DPORT SHA path (#392)

Per-nonce path on the classic ESP32 (DPORT bus) was reading all 8
digest words + doing byte-swap + share_validate for every nonce
since #330+#333. Hashrate dropped from ~375 kH/s to ~156 kH/s on
esp32-wroom32 builds.

Restores a pool-target-aware early-reject: read just digest word 7
(MSB), compare against the high-order 32 bits of the pool target,
skip the rest if it can't meet target. Works for any pool difficulty
including sub-1 (unlike the hardcoded 0xFFFF mask removed in #330).

Plumbs target_word0_max through hw_backend_ctx_t and the
sha256_hw_dport_per_nonce signature. Lockstep self-test passes a
permissive 0xFFFFFFFF threshold to preserve byte-equality semantics.

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

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