fix: rename $class param to $class_name + ignore UnfinishedPrepare + ruleset cleanup

- autoloader.php load() + migration-runner.php class_to_file(): rename $class
  parameter to $class_name to satisfy
  Universal.NamingConventions.NoReservedKeywordParameterNames.classFound
- dosing-repository.php line 81: add phpcs:ignore UnfinishedPrepare on
  $wpdb->prepare() — {} is a builder-constructed safe value,
  not an unfinished placeholder
- phpcs.xml.dist: remove incorrect rule names (WordPress.WP.ReservedKeyword.class,
  WordPress.DB.PreparedSQLPlaceholders.ReplacementsFound); fix excluded names to
  match actual sniff IDs from CI logs

Agent-Session: claude-adopt-ci-20260616

includes/repositories/class-pr-core-dosing-repository.php

@@ -77,7 +77,7 @@ class PR_Core_Dosing_Repository {
 
 		// phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery
 		$rows = $wpdb->get_results(
-			$wpdb->prepare(
+			$wpdb->prepare( // phpcs:ignore WordPress.DB.PreparedSQLPlaceholders.UnfinishedPrepare -- dynamic {$where_sql} is builder-constructed, not a placeholder
 				"SELECT * FROM {$table} WHERE {$where_sql} ORDER BY evidence_strength DESC, study_year DESC", // phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared
 				...$params
 			),