Unblock rollback-mechanism work by identifying missing code in current branch snapshot

[Copilot]

The issue requests a lightweight, explicit rollback path for adaptation (snapshot/restore on metric degradation), degradation-rate tracking, and an ablation switch. In the current branch snapshot, those code paths are not present, so implementation could not proceed.

• What changed

  • Confirmed repository contents only include:
    • README.md
    • .gitignore
    • LICENSE
  • Verified HEAD and remote branch state in this workspace match that minimal file set.
  • Reported an explicit blocker requesting the branch/commit that contains adaptation + online-metric logic.

• Why this matters

  • The required behavior touches runtime adaptation internals that are absent from the checked-out tree.
  • Proceeding without those files risks inventing incompatible scaffolding instead of making surgical, reviewable changes.

• Expected next step

  • Re-run this change against the branch/commit containing the adaptation implementation so rollback, degradation stats, and the rollback-disable switch can be added in-place with focused tests.

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