chore(main): release 12.0.0

[github-actions]

🤖 I have created a release beep boop

12.0.0 (2025-11-22)

⚠ BREAKING CHANGES

• cleanup references of --compilers (#5403)
• change the default of --forbid-only to check for process.env.CI (#5496)
• bump minimum Node.js version from 18.18.0 to 20.19.0 (#5477)

🌟 Features

• allow FIFOs as test files (#5512) (ca4af43)
• bump minimum Node.js version from 18.18.0 to 20.19.0 (#5477) (1c34eef)
• change the default of --forbid-only to check for process.env.CI (#5496) (3d94dde)
• cleanup references of --compilers (#5403) (f75d150)

🩹 Fixes

• correct assertion import syntax in getting-started guide (#5526) (fb0215b)
• handle empty null-prototyped objects (#5506) (2a0bce0)

📚 Documentation

• add maintainer expectations to MAINTAINERS.md (#5514) (76f95a1)
• migrate how-to wiki pages to main documentation (#5463) (b85aec6)
• migrate programmatic usage to docs, development content to DEVELOPMENT.md (#5464) (cb47925)
• test/integration/README: remove ref to non-existent dir (#5516) (d2c2d40)

🧹 Chores

• applied formatting to all files (#5493) (76d7194)
• fix broken link in .github/CONTRIBUTING.md (681e843)
• remove Node.js 18 from test-smoke in CI too (d643105)
• switch from Coveralls to Codecov (#5447) (f4e7e54)
• use ps-list instead of pidtree to remove wmic (#5479) (b2985b3)

🤖 Automation

• deps: bump actions/setup-node in the github-actions group (#5503) (9a70533)

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[mark-wiemer]

I think we're all on the same page, but to be extremely clear: we're going to release a nonzero number of betas before releasing Mocha v12. Ref #5357 :)