Standardize deploy pipeline

[fumikito]

Summary

• Replace wordpress.yml (release.published trigger) with standard deploy pattern
• Add deploy.yml (tag push *.*.* trigger) with wp-readme + versioning actions
• Add release-publish.yml to create version tag from release

Deploy flow

1. Merge PRs → release-drafter updates draft
2. Publish release → release-publish.yml creates x.y.z tag
3. Tag push → deploy.yml builds, versions, deploys to WordPress.org

Changes

Before	After
wordpress.yml on release.published	release-publish.yml → tag → deploy.yml
No wp-readme/versioning	wp-readme + versioning actions
Hardcoded Node 22	.node-version file
gh release upload	softprops/action-gh-release@v2

Test plan

• Verify release-publish creates correct tag on next release
• Verify deploy.yml triggers and deploys successfully

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