Mason Daugherty 2458a7912e ci(infra): port four CI governance workflows (#37511) ...

Four GitHub Actions workflows ported from the Deep Agents monorepo to
enforce repository hygiene rules that were not previously applied here.

## Changes

- **Fork-main PR guard**: closes PRs from forks whose head is `main` or
`master`, with a sticky comment explaining how to reopen from a feature
branch. Prevents the "Update branch" → admin-override path that lets a
`Merge branch 'master' into master` commit land on the default branch
and bypass squash-only policy. Maintainers can override with a
`bypass-fork-main-check` label.
- **Monthly uv pin bump**: opens a PR on the first of each month to
advance `UV_VERSION` in the composite setup action. Probes
`releases.astral.sh` across four architectures before committing so CI
doesn't race a lagging mirror on fresh-release days — the gap
Dependabot's `github-actions` ecosystem can't cover because it tracks
`uses:` SHA pins, not the inline `UV_VERSION` value.
- **Extras-sync validation**: a Python script (`check_extras_sync.py`)
and companion workflow that detect version-constraint drift between
`[project.dependencies]` and `[project.optional-dependencies]` across
every `libs/**/pyproject.toml`. Runs on PRs touching any
`pyproject.toml` and on pushes to `master`; is a no-op on packages that
declare no extras.
- **Banned-trailer pre-merge lint**: rejects PR descriptions containing
a `Co-authored-by: ... <noreply@anthropic.com>` trailer before the PR
reaches merge, where the org ruleset would reject the squash-push
anyway. Posts a sticky comment with remediation steps; updates it to a
"resolved" state when the trailer is removed, rather than deleting
(which requires elevated token scope on fork PRs).

2026-05-18 17:12:21 -05:00

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