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feat(gpt): gpt_write_one -- a new disk of one partition, for the real Zuse's stick (#92, 4.3) [skip ci]

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The old MBR zeroed first, the backup header and entries, the primary, the protective MBR last: a write torn anywhere leaves no table. Builds clean on amd64, aarch64, riscv64; checked on the host against blank 600 MiB and 32 MiB images and a used Zuse stick (sfdisk --verify clean, gpt_read reads it back). Not yet called.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GE3SDvQn5EoxdGufk84zz2
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Claude
2026-11-08 18:12:04 +00:00
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commit e94cd3245d
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docs/v4.0.0/plans/2026-10-29-stick-5-proxy-zuse-and-real-zuse.md
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@@ -353,7 +353,7 @@ Tasks 1-3 accepted and merged (#159, master 594d2f93); #155 merged with them.
**Task 4, `MINT-ZUSE`** (Captain Bob, 2026-11-08: "work in small increments and memorize frequently"):
- [x] 4.1 the first failing test: `qemu_session.py` mode `mint_zuse` and `add_stick(n, img, port)`
- [x] 4.2 run `mint_zuse` on amd64 before any kernel change: FAIL, "UNKNOWN WORD: 'MINT-ZUSE'" (logs/20261108-175928); the prompt check tightened to need the minted line first
- [ ] 4.3 `gpt_write_one()` in `kernel/src/gpt.c` (one partition, protective MBR, both headers)
- [x] 4.3 `gpt_write_one()` in `kernel/src/gpt.c` (one partition, protective MBR, both headers): builds clean on three ISAs; checked on the host (a throwaway harness, not in the tree) -- 600 MiB and 32 MiB blank images and the pair's used Zuse stick each give one identity partition, `gpt_read` reads it back, `sfdisk --verify` clean. Not yet called.
- [ ] 4.4 `sk_v4_identity_offer_wait()` / `sk_v4_identity_recheck_offered()`: a stick offered, not attached, while a mint waits
- [ ] 4.5 `sk_v4_mint.c`: the flow -- plug-in line, size line, `YES`, GPT, zeroed, minted, read back, marker
- [ ] 4.6 `MINT-ZUSE` in `sk_v4_words[]` (request 2): word_count 317 -> 318