Update coding standards configuration

[jeremyfelt]

Summary

• Fix phpcompat pinning to use the repository block approach (the dev-develop alias doesn't work)
• Add .claude to .gitignore

Test plan

• Verify composer phpstan runs successfully
• Verify composer phpcs still works

🤖 Generated with Claude Code

[github-actions]

🔍 WordPress Plugin Check Report

❌ Status: Failed

📊 Report

🎯 Total Issues	❌ Errors	⚠️ Warnings
6	6	0

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❌ Errors (6)

📁 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	plugin_updater_detected	Including An Update Checker / Changing Updates functionality. Plugin Updater detected. Use of the Update URI header is not allowed in plugins hosted on WordPress.org.
0	missing_direct_file_access_protection	PHP file should prevent direct access. Add a check like: if ( ! defined( 'ABSPATH' ) ) exit;

📁 README.md (3 errors)

📍 Line	🔖 Check	💬 Message
0	missing_readme_header_tested	The "Tested up to" header is missing in the readme file.
0	no_license	Missing "License". Please update your readme with a valid GPLv2 (or later) compatible license.
0	no_stable_tag	Invalid or missing Stable Tag. Your Stable Tag is meant to be the stable version of your plugin and it needs to be exactly the same with the Version in your main plugin file's header. Any mismatch can prevent users from downloading the correct plugin files from WordPress.org.

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[github-actions]

Changed files were detected after build. Please run project build workflows and check git status for any missed changes.

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