chore(ci): add CI auto-fix workflow

[razinkele]

Adds a workflow that runs when the main CI workflow fails, attempts to apply formatting fixes (ruff/black), and opens a PR with fixes or a diagnostic draft PR for human triage. The scope is intentionally limited to safe formatting auto-fixes; non-trivial failures are opened as draft PRs for review.

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📥 Commits

Reviewing files that changed from the base of the PR and between f18b635 and b910870.

📒 Files selected for processing (1)

• .github/workflows/ci-auto-fix.yml

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[razinkele]

Update: workflow now enables auto-merge for formatting-fix PRs created by this action (PRs will auto-merge when checks pass). Draft diagnostic PRs remain as drafts for manual triage.

[razinkele]

Update: formatting PRs created by this workflow will now be labeled �uto-fix (the workflow creates the label if missing).

[razinkele]

Update: the workflow now creates non-draft diagnostic PRs (label ci-fail will be created if missing). These PRs are intended for human triage; formatting PRs still auto-merge when checks pass.