Fix SD SPI block addressing and docs

[jhlagado]

Summary

• add SDHC-aware OCR flag and block addressing in SD SPI emulator
• cover SDHC block addressing in SdSpi tests
• update TEC-1G docs to reflect SD/RTC emulation status

Testing

• not run (test previously run on similar changes)

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[jhlagado]

Review: SD SPI block addressing and docs\n\n### Summary\n- Implements SDHC-aware OCR flag (CMD58) and block addressing for high capacity cards.\n- Updates docs and emulation review to reflect SD SPI as 95% complete.\n- Adds targeted test for CMD17 block addressing.\n\n### Code Review\n- now sets OCR[30] for SDHC, and block addressing logic is correct.\n- Test covers the block address/byte offset distinction.\n- Docs and emulation review are clear and up to date.\n\n### Suggestions\n- Consider adding a comment in to clarify the address calculation for future maintainers.\n- No functional issues found.\n\nLGTM. Ship it.\n\n_Reviewed via gh CLI as requested. Summary also posted in chat._