feat!: drop Node.js 20, require Node.js >=22.12.0

[mizdra]

Summary

• Drop Node.js 20 support and require Node.js >=22.12.0 across all publishable packages (with minor changeset)
• Add Node.js 24 to the CI test/vscode-test matrix, and bump single-version jobs (lint, build, test-stylelint-v16, check-generated-in-examples) to Node.js 24

Changes

Commit 1: Drop Node.js 20 (feat)

• Updated engines.node from >=20.19.0 to >=22.12.0 in core, ts-plugin, codegen, eslint-plugin, stylelint-plugin
• Removed Node.js 20 from test and vscode-test CI matrix
• Added changeset (minor bump for all 5 packages)

Commit 2: Add Node.js 24 to CI (ci)

• Bumped lint, build, test-stylelint-v16, check-generated-in-examples jobs to Node.js 24
• Added Node.js 24 to test and vscode-test matrix → matrix is now [22, 24]

Test plan

• CI passes on both Node.js 22 and Node.js 24 for test/vscode-test matrix jobs
• CI passes on Node.js 24 for lint, build, test-stylelint-v16, check-generated-in-examples

🤖 Generated with Claude Code

[changeset-bot]

🦋 Changeset detected

Latest commit: 8ee293b

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 6 packages

Name	Type
@css-modules-kit/codegen	Major
@css-modules-kit/core	Major
@css-modules-kit/eslint-plugin	Major
@css-modules-kit/stylelint-plugin	Major
@css-modules-kit/ts-plugin	Major
css-modules-kit-vscode	Major

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