ci: drop macOS from the release gate

[OnlineChef (ChefGroep)]

Summary

• macOS CI is out of the cross-platform matrix and out of the release/container required-job list.
• Linux (jan) and Windows stay required. A green run of those jobs is enough to publish.

Test plan

• bun test tests/ci-workflows.test.ts (85 pass)

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📥 Commits

Reviewing files that changed from the base of the PR and between ebd17a2 and 5b0dfd3.

📒 Files selected for processing (5)

• .github/workflows/ci.yml
• .github/workflows/container.yml
• .github/workflows/release.yml
• CONTRIBUTING.md
• tests/ci-workflows.test.ts

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