[spilist]

Why

charness did not run on Windows hosts (the ceal team's Windows seats). Each seat carried a local patch that had to be reapplied on every charness update.

What changes

Windows portability fixes:

1. Scratch owner locking works without fcntl (Windows has none).
2. Runtime snapshots honor the Windows temporary-directory variables, so child processes use the right temp folder.
3. Reviewer commands are quoted for the Windows shell instead of POSIX quoting, which cmd.exe rejects.
4. Windows critique producers use the running Python interpreter.
5. Scratch inventory and restored paths are normalized for Windows separators.
6. POSIX permission-bit assertions are limited to platforms that support them.

Fixes found while running the full release lane on this branch:

• Final lane progress is observed after output capture drains (a receipt could miss the terminal report); the lane-watch test fake now matches the interface.
• Release fixtures no longer recurse through Git wrappers.
• Final progress observation catches only recoverable I/O failures instead of every exception.
• The app-server client reports a child that already exited before it reports a response timeout. Under load, the old order turned an exit into a timeout. The EOF case passed 50 of 50 runs with 8 in parallel.
• The Windows critique producer interpreter selection has a test.

Verification

./scripts/run-quality.sh --full --read-only --release passed at d034937: 90 passed, 0 failed (4 opt-in phases not run). The pre-push hook ran the same lane on push.

[coderabbitai]

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