Standardize CI/CD workflows

[fumikito]

Summary

• Split monolithic wordpress.yml into separate workflows (test / deploy / release-drafter / release-publish)
• Add PHPStan to test.yml CI pipeline
• Add Status Check as required gate for all CI jobs
• Add wp-readme + versioning actions to deploy pipeline
• Add release-drafter for automatic release note generation
• Add Claude Code AI review workflow
• Standardize wp-outdated.yml

Workflows

File	Trigger	Purpose
test.yml	PR	phpcs + phpstan + phpunit + assets + Status Check
deploy.yml	Tag push	WordPress.org deploy with wp-readme + versioning
release-drafter.yml	Push to master	Auto-generate release notes
release-publish.yml	Release published	Create version tag
claude-review.yml	CI pass / @claude comment	AI code review
wp-outdated.yml	Monthly cron	WP version monitoring

Test plan

• CI passes on this PR (test.yml runs correctly)
• Status Check job aggregates all test results

🤖 Generated with Claude Code