ci: add a static-named Verify gate job for the required check

[ScriptedAlchemy]

Summary

Adds a verify-gate job ("Verify gate") to ci.yml that always runs after the Verify matrix and passes when every leg passed or the matrix was skipped, fails when a leg failed or was cancelled.

Why: the new main branch protection (#536) requires Verify (Node 24). On docs-only PRs the Verify matrix job is skipped, and GitHub reports a skipped matrix job under its unexpanded name — Verify (Node ${{ matrix.node-version }}) — so the required context never appears and the PR is blocked indefinitely (observed on #548). A static-named gate job is the standard fix; once this lands, the protection's required context switches from Verify (Node 24) to Verify gate.

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

[changeset-bot]

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Latest commit: d334d2b

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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 2026-09-04T08:15:41.174496Z	d334d2b	PR opened

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[pkg-pr-new]

npm i https://pkg.pr.new/ScriptedAlchemy/agent-bundle@549

npm i https://pkg.pr.new/ScriptedAlchemy/agent-bundle/create-agent-bundle@549

npm i https://pkg.pr.new/ScriptedAlchemy/agent-bundle/@agent-bundle/runtime@549

commit: d334d2b