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.
7cda6446eaJulius Marminge committed on 9/1/2026, 4:32:53 AMparent746d6fd
3 files changedLine totals unavailable