Add M6 SRAM mailbox design doc, implementation plan, mark M6 complete

- Protocol design: streaming single-hold NFC transfer, 7 commands
- Implementation plan: 7 tasks for subagent-driven development
- STATUS.md: M6 marked complete, current milestone now M7

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
michael
2026-03-05 16:20:52 -08:00
parent 3469944209
commit 43cda8ac3d
3 changed files with 1255 additions and 6 deletions

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