chore(repo): remove tracked audit scratch files

Remove obsolete implementation plans and the probe write marker so temporary work artifacts no longer ship with the repository.

Audit: H01

Implemented by GPT-5.6 Sol with Codex.
fdf7ba9657Julius Marminge committed on 9/21/2026, 5:31:37 AMparente265289
3 files changedLine totals unavailable