Modernize coding standards configuration

[jeremyfelt]

Summary

• Switch from raw WPCS/PHPCompat dependencies to happyprime/coding-standards
• Simplify phpcs.xml to reference the shared Happy Prime ruleset
• Add phpstan.neon.dist (level 9) with phpstan script
• Add .editorconfig for consistent editor formatting
• Add phpstan.yml, deploy-to-readme.yml, deploy-to-wp.yml, and plugin-check.yml workflows
• Update .gitignore and .distignore
• Update composer.lock

Test plan

• Verify composer phpcs still works (ruleset changed)
• Verify composer phpstan runs successfully
• Verify new workflows run on this PR

🤖 Generated with Claude Code

[github-actions]

🔍 WordPress Plugin Check Report

❌ Status: Failed

📊 Report

🎯 Total Issues	❌ Errors	⚠️ Warnings
4	4	0

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❌ Errors (4)

📁 plugin.php (3 errors)

📍 Line	🔖 Check	💬 Message
0	plugin_header_no_license	Missing "License" in Plugin Header. Please update your Plugin Header with a valid GPLv2 (or later) compatible license.
0	missing_direct_file_access_protection	PHP file should prevent direct access. Add a check like: if ( ! defined( 'ABSPATH' ) ) exit;
79	WordPress.WP.I18n.MissingArgDomain	Missing $domain parameter in function call to __().

📁 readme.txt (1 error)

📍 Line	🔖 Check	💬 Message
0	outdated_tested_upto_header	Tested up to: 6.2 < 6.9. The "Tested up to" value in your plugin is not set to the current version of WordPress. This means your plugin will not show up in searches, as we require plugins to be compatible and documented as tested up to the most recent version of WordPress.

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