Update coding standards configuration

[jeremyfelt]

Summary

• Fix phpcompat pinning to use the repository block approach (the dev-develop alias doesn't work)
• Remove deprecated PHPUnit 10 attributes from phpunit.xml.dist
• Add .editorconfig for consistent editor formatting
• Add .claude to .gitignore

Test plan

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

🤖 Generated with Claude Code

[github-actions]

🔍 WordPress Plugin Check Report

❌ Status: Failed

📊 Report

🎯 Total Issues	❌ Errors	⚠️ Warnings
5	4	1

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❌ Errors (4)

📁 readme.txt (1 error)

📍 Line	🔖 Check	💬 Message
0	outdated_tested_upto_header	Tested up to: 6.7 < 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.

📁 src/Admin.php (1 error)

📍 Line	🔖 Check	💬 Message
0	missing_direct_file_access_protection	PHP file should prevent direct access. Add a check like: if ( ! defined( 'ABSPATH' ) ) exit;

📁 src/Init.php (1 error)

📍 Line	🔖 Check	💬 Message
0	missing_direct_file_access_protection	PHP file should prevent direct access. Add a check like: if ( ! defined( 'ABSPATH' ) ) exit;

📁 plugin.php (1 error)

📍 Line	🔖 Check	💬 Message
0	missing_direct_file_access_protection	PHP file should prevent direct access. Add a check like: if ( ! defined( 'ABSPATH' ) ) exit;

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⚠️ Warnings (1)

📁 composer.json (1 warning)

📍 Line	🔖 Check	💬 Message
0	missing_composer_json_file	The "/vendor" directory using composer exists, but "composer.json" file is missing.

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