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fix(mining): serialize cross-core DPORT reads in SHA driver (classic ESP32 erratum) (#451)

- replace raw `*sha_busy` volatile pointer reads with `DPORT_REG_READ(SHA_256_BUSY_REG)` at all five wait-idle sites in the kernel hot loop — raw reads are unsafe across cores under the DPORT bus erratum
- replace raw `sha_text[7]` early-reject read with `DPORT_REG_READ(SHA_TEXT_BASE + 7*4)` — a stale zero from the other core caused the spurious zero-hash pass-through confirmed on wroom32
- drop the now-unused `sha_busy` volatile pointer from the kernel's local declarations
- reverts the core-0 pin approach (2f3734e + bc6c90d) in favour of fixing the erratum at the register-access layer; mining stays on core 1, task topology unchanged

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

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