ci: run required checks on merge_group for the merge queue

[ScriptedAlchemy]

Summary

Adds a merge_group: (branches: main) trigger to every workflow that provides a required check on main — ci.yml (Verify, Examples check, Release gates, Host install proofs), docs.yml (Docs site), and changeset.yml (Changeset present) — so a GitHub merge queue can gate on them.

Context: twice today individually-green PRs broke main when combined (#486×#490, #518×#509). GitHub's merge queue is the fix, but it is only offered to organization-owned repositories: creating a merge_queue ruleset on this user-owned repo returns 422 Invalid rule 'merge_queue'. As the fallback, classic branch protection on main now requires the six checks above and an up-to-date branch (required_status_checks.strict: true). The merge_group triggers are therefore dormant, documented as such in each workflow, and make queue adoption a single ruleset away once the repository moves to an organization.

Details

• ci.yml: merge_group trigger; Verify runs the Node 24 leg for queue entries (the required context is Verify (Node 24)), the full matrix still runs on every main push. The changes job stays PR-only, so queue entries never skip heavy jobs (same as main pushes). Concurrency is SHA-keyed with no cancellation for queue entries.
• docs.yml: merge_group trigger; build only, deploy steps remain gated on push/dispatch of main.
• changeset.yml: merge_group trigger; the queue run reports success without evaluating (a merge_group event carries no PR labels and stacks earlier queue entries). Enforcement remains on the pull request, which must be green to enter the queue. Concurrency group falls back to github.sha when there is no PR number.

Validated with actionlint. CI-only: skip-changeset.

[changeset-bot]

⚠️ No Changeset found

Latest commit: df3f51a

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[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-04T06:34:37.744329Z	274cbee	PR opened

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[pkg-pr-new]

npm i https://pkg.pr.new/ScriptedAlchemy/agent-bundle@536

npm i https://pkg.pr.new/ScriptedAlchemy/agent-bundle/create-agent-bundle@536

npm i https://pkg.pr.new/ScriptedAlchemy/agent-bundle/@agent-bundle/runtime@536

commit: df3f51a