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.
b3bd9c4eccJulius Marminge committed on 9/5/2026, 4:54:28 AMparent01fb9b2
3 files changedLine totals unavailable