chore(ci): modernize

[avivkeller]

Closes #5587

Action Items:
Change required checks to:

• CI / Lint & Check Types
• CI / Test - macos-latest (Node.js 18.x)
• CI / Test - macos-latest (Node.js 20.x)
• CI / Test - macos-latest (Node.js 22.x)
• CI / Test - macos-latest (Node.js 24.x)
• CI / Test - ubuntu-latest (Node.js 18.x)
• CI / Test - ubuntu-latest (Node.js 20.x)
• CI / Test - ubuntu-latest (Node.js 22.x)
• CI / Test - ubuntu-latest (Node.js 24.x)
• CI / Test - windows-latest (Node.js 18.x)
• CI / Test - windows-latest (Node.js 20.x)
• CI / Test - windows-latest (Node.js 22.x)
• CI / Test - windows-latest (Node.js 24.x)
• Validate PR / Lint Commit Messages

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.49%. Comparing base (b550a70) to head (243ee2d).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5623   +/-   ##
=======================================
  Coverage   83.49%   83.49%           
=======================================
  Files          13       13           
  Lines        2054     2054           
  Branches      756      756           
=======================================
  Hits         1715     1715           
  Misses        305      305           
  Partials       34       34           

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[bjohansebas]

If you need me to do a re-run, let me know on Discord or Slack.

[Copilot]

Pull request overview

This pull request modernizes the CI infrastructure by replacing per-commit linting with PR title validation, removing support for Node.js versions older than 18, consolidating workflows, and updating GitHub Actions to pinned versions for better security.

Key Changes

• Replaces commitlint with PR title validation using amannn/action-semantic-pull-request
• Removes Node.js 18-specific workarounds (dynamic import polyfills, test mocking)
• Consolidates the old nodejs.yml workflow into a new streamlined ci.yml
• Updates GitHub Actions to use pinned commit hashes for security

Reviewed changes

Copilot reviewed 12 out of 13 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
.github/workflows/ci.yml	New consolidated CI workflow with lint and test jobs for Node.js 18.x, 20.x, 22.x, 24.x
.github/workflows/validate-pr-title.yml	New workflow for validating PR titles against conventional commit format
.github/workflows/nodejs.yml	Removed old workflow file (replaced by ci.yml)
.github/workflows/dependency-review.yml	Enhanced with better documentation and pinned action versions
.github/dependabot.yml	Added GitHub Actions dependency updates
package.json	Removed commitlint dependencies and related npm script
package-lock.json	Removed all commitlint-related dependencies
commitlint.config.js	Removed configuration file
.husky/commit-msg	Removed commitlint hook
scripts/prepare-test-for-old-node.js	Removed Node.js 18 compatibility script
test/server/open-option.test.js	Removed Node.js version-specific mocking logic
CONTRIBUTING.md	Updated to clarify PR title requirements
.cspell.json	Updated dictionary (removed "commitlint", added "amannn")

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[avivkeller]

@bjohansebas Can you re-run?