R4.11: round 1 verdict

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

tasks/reviews/R4.11-r1.md

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+1. `.work/R4.11/lib.ps1:28` — [P2] The acceptance driver's backup does not preserve an originally absent configuration file. All five scripts reuse `run/kept`; `Keep-Data` overwrites existing files but leaves old snapshots when a source file is missing, and `Restore-Data` restores those snapshots unconditionally. Run the driver once with `settings.json` present, delete that file to reset the settings, then run it again: the second run restores the first run's obsolete settings instead of leaving the file absent. The same applies to session, recent-file and view state. Reproduced using the unchanged backup/restore functions with disposable directories; evidence: `.work/R4.11-r1/backup-probe.log`. Use a fresh backup directory for each run, or record each file's original presence and clear stale snapshots for absent files; add a two-run regression that verifies both bytes and absence are restored.