Renovate PR fix

Prefer a source-only fix that works with both the current and target dependency versions. Keep fixes separate from grouped Renovate updates; extract a bump only when compatibility requires it.

Inputs

• A Renovate PR URL (mui/<repo>/pull/<num>) → repo comes from the URL.
• A bare PR number → resolve the repo from the checkout's git remotes (the first mui/<repo> remote, preferring the MUI repository).
• Read the target repository's instructions and use an isolated worktree from that repository. Preserve unrelated user changes.

Gather current evidence

• Read the PR's current head, dependency diff, release notes, and failing CI logs.
• Reuse prior triage findings only after comparing their inspected commit with the current head. If the head changed, reassess the changed diff and reproduce the relevant failure.
• Diagnose directly from current evidence when no prior analysis is available.