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feat: add classic ESP32 (WROOM-32) headless board variant (TA-271) (#294)

Adds an esp32-wroom32 board variant for the ELEGOO classic ESP32-D0 dev module — no display, no ASIC, drives the SHA peripheral via raw DPORT MMIO for SW mining.

- new env esp32-wroom32 + esp32-wroom32-debug in platformio.ini, sdkconfig deltas, 4MB partition table
- sha256_hw split into _ahb backend (S3/S2/C3 AHB-bus, midstate-injection pipeline) and _dport backend (classic ESP32, DPORT-bus per-nonce loop with re-hashed block1 since H regs aren't writable)
- DPORT path serializes register reads via DPORT_INTERRUPT_DISABLE + DPORT_SEQUENCE_REG_READ per Espressif erratum, with KB#323 periph_module_reset on first acquire to clear any latched BUSY across soft reboot
- on-boot SHA('abc') known-vector self-test logs [TA271-DIAG] PASS/FAIL before the mining task starts
- bswap32 each input word on fill so the peripheral sees canonical M[i] for BTC headers stored in BTC byte order (without this, every share got rejected 'Difficulty too low')

~280 KH/s on the bench WROOM-32 with first share pool-accepted. Not added to default_envs or the CI/release matrix yet — pending tuning (TA-320). TA-322 will promote the self-test into a shared boot gate across all backends.

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

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