ci(commits): check conventional commit style and dispatch the compaction bot

[Graffioh]

What

Two workflows for commit history.

1. Commit style check: commit-style.yml (no LLM)

It checks every non-merge commit in a PR with a plain regex (.github/ci/check_commit_messages.py):

• Subject format: type(scope): summary, where type is one of feat, fix, perf, refactor, docs, test, bench, build, ci, chore, revert (CONTRIBUTING's list plus build/revert, which main already uses).
• Scope: required and lowercase, e.g. fix(server): .... A bare fix: ... fails.
• Length and punctuation: subject ≤ 100 characters, no trailing period, and a blank line before the body.
• Allowed as is: GitHub's Revert "..." subjects and merge commits.

These limits come from the last 600 commits on main: 105 subjects exceed 72 characters, 3 exceed 100, none end with a period, and every scope is lowercase. 36 of those 600 have no scope and would now fail. On real history it passes #743 and #733 and flags #738's four ggml-cuda: ... / harness: ... subjects. Failures point to the compact-commits label.

2. Compaction bot trigger: compact-commits.yml

Adding the compact-commits label forwards the PR to the commit compaction bot, which runs outside this repository.

• What this workflow does: it only forwards the request. It checks out and runs nothing, and has permissions: {}.
• What the bot does:
  • re-checks the request: write access, PR open, not a draft, still labelled;
  • folds the commits into a few conventional commits without changing the code (the tree hash is verified);
  • validates each message with this repo's check_commit_messages.py;
  • force-pushes under a lease on the old head, comments the old-to-new mapping, and removes the label.
  • It never merges.

Setup

• Secrets LUCEBOX_BOTS_DISPATCH_TOKEN and LUCEBOX_BOTS_DISPATCH_REPO (see the maintainers' setup notes).
• Delete the now unused COMPACT_BOT_TOKEN, OPENROUTER_API_KEY and COMPACT_MODEL secrets.
• compact-commits label.

Testing

• 16 style-check tests. CI runs them in the uv-workspace job.
• Checked the forwarded request's body against a nonexistent target, so nothing was triggered.

🤖 Generated with Claude Code

[Graffioh]

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[cubic-dev-ai]

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