ci: add CI Gate, one stable check name for branch protection (#281)

[pftg]

Closes the last box on #281.

Matrix cell names carry their ruby and gemfile, so a branch-protection rule that lists them silently stops requiring anything when the matrix changes shape — it just did (#295), and #249 will change it again.

CI Gate depends on the jobs instead of naming them. Branch protection requires that one check, forever.

• skipped passes — the matrix is off on ordinary PRs by design.
• cancelled fails — a cell killed before it reported carries no verdict.

Human step after merge: Settings → Branches → require CI Gate on master.

Summary by Sourcery

Add a stable aggregate CI check for branch protection across changing test matrices.

Enhancements:

• Add a stable CI Gate check that aggregates required workflow jobs for reliable branch protection.

CI:

• Make the CI Gate fail when required jobs fail or are cancelled while allowing skipped matrix jobs to pass.

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📥 Commits

Reviewing files that changed from the base of the PR and between 7691b5e and f96b3de.

📒 Files selected for processing (1)

• .github/workflows/test.yml

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[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Adds an always-evaluated CI Gate workflow job with a stable check name that aggregates the required CI jobs, treating failures and cancellations as failures while permitting intentionally skipped matrix jobs; after merging, branch protection must be configured to require this check on master.

File-Level Changes

Change	Details	Files
Add a stable aggregate check that reports the combined status of all CI job groups for branch protection.	Create an always-evaluated CI Gate job with a fixed display name. Declare dependencies on the setup, functional, matrix, and screenshot-driver jobs. Fail when any dependency fails or is cancelled, while allowing skipped dependencies to pass.	.github/workflows/test.yml

Possibly linked issues

• Master CI gatekeeper: a green PR does not predict a green master #281: The PR implements the issue’s branch-protection remedy by adding a stable CI Gate aggregating matrix results.

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