chore: fix ci

[AxiosLeo]

…recision

---

Note

Updates CI to test on Node 18–25, stops ignoring .github/, and adds targeted ESLint suppressions in code and tests.

• CI/CD:
  • Update node-version matrix in .github/workflows/ci.yml to [18, 20, 22, 24, 25] (drop 14, 16).
  • Stop ignoring .github/ by removing it from .gitignore.
• Linting:
  • Add /* eslint-disable no-unused-vars */ in src/helper/cmd.js.
  • Add inline ESLint disables for unused var in src/lib/os-locale.js catch blocks.
  • Remove global ESLint disable comment from src/helper/str.js header.
• Tests:
  • Add // eslint-disable-next-line no-loss-of-precision for large numeric literals in tests/is.tests.js.

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