Flash erase + write: complete SPI flash driver#19

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widgetii wants to merge 3 commits intomasterfrom

feature/flash-erase-write

Commits on Mar 31, 2026

WIP: Flash erase+write with mode switching and sector unlock

widgetii
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claude
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Fix flash erase: read status via DATA path, not STATUS register

widgetii
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claude
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Flash write working: chunked 16KB blocks, page-by-page programming

widgetii
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claude
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