Summary

Adds the project-wide phpcs.xml.dist configuration as agreed in Discussion #22 and tracked by #47.

• PSR-12 base for naming conventions and code structure
• WordPress whitespace conventions: tab indentation, spaces inside parentheses for control structures, cast spacing, operator spacing, and array declaration spacing
• WordPress security sniffs: WordPress.Security, WordPress.DB.PreparedSQL, WordPress.WP.EnqueuedResources, WordPress.PHP.NoSilencedErrors, WordPress.WP.DeprecatedFunctions
• Yoda conditions disabled per team agreement
• PHP 8.1+ compatibility via PHPCompatibilityWP
• Pattern folder exclusions for GlobalVariablesOverride and ScopeIndent

Closes #47

Test plan

• Run composer install (ensure squizlabs/php_codesniffer, wp-coding-standards/wpcs, and phpcompatibility/phpcompatibility-wp are available)
• Run vendor/bin/phpcs from the repo root and verify it picks up phpcs.xml.dist
• Confirm tab indentation is enforced and space indentation is flagged
• Confirm WordPress whitespace rules apply (e.g., if( $x ) flags missing space after if)
• Confirm PSR-12 naming rules apply (e.g., class names must be PascalCase)
• Confirm files in */patterns/* are excluded from GlobalVariablesOverride and ScopeIndent sniffs
• Confirm */vendor/*, */node_modules/*, and */build/* directories are excluded

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