diff --git a/inc/Support/GitRunner.php b/inc/Support/GitRunner.php
index 4ba4ec7..3f2ef62 100644
--- a/inc/Support/GitRunner.php
+++ b/inc/Support/GitRunner.php
@@ -121,7 +121,7 @@ public static function run( string $path, string $args, int $timeout_seconds = 0
 		);
 
 		if ( is_wp_error($result) ) {
-			$data = $result->get_error_data();
+			$data = method_exists($result, 'get_error_data') ? $result->get_error_data() : array();
 			$data = is_array($data) ? $data : array();
 			if ( $timeout_seconds > 0 && isset($data['timeout']) ) {
 				return new \WP_Error('git_command_timeout', $result->get_error_message(), $data);
diff --git a/inc/Workspace/Workspace.php b/inc/Workspace/Workspace.php
index d6efc49..42ea274 100644
--- a/inc/Workspace/Workspace.php
+++ b/inc/Workspace/Workspace.php
@@ -29,6 +29,7 @@
 require_once __DIR__ . '/WorkspaceWorktreeLifecycle.php';
 require_once __DIR__ . '/WorkspaceWorktreeInventoryCleanup.php';
 require_once __DIR__ . '/WorkspaceWorktreeEmergencyCleanup.php';
+require_once __DIR__ . '/WorktreeCleanupClassifier.php';
 
 class Workspace {
 
@@ -3444,44 +3445,7 @@ private function worktree_declares_submodules( string $path ): bool {
 	 * @return array<string,int>
 	 */
 	private function worktree_cleanup_buckets( int $candidate_count, array $candidates_by_signal, array $skipped_by_reason ): array {
-		$needs_reconciliation         = (int) ( $skipped_by_reason['needs_metadata_reconcile'] ?? 0 )
-		+ (int) ( $skipped_by_reason['requires_full_scan'] ?? 0 )
-		+ (int) ( $skipped_by_reason['missing_metadata'] ?? 0 )
-		+ (int) ( $skipped_by_reason['lifecycle_reconciliation_candidate'] ?? 0 );
-		$needs_full_review            = (int) ( $skipped_by_reason['active_no_signal'] ?? 0 )
-		+ (int) ( $skipped_by_reason['no_inventory_cleanup_signal'] ?? 0 )
-		+ (int) ( $skipped_by_reason['no_merge_signal'] ?? 0 )
-		+ (int) ( $skipped_by_reason['github_unknown'] ?? 0 )
-		+ (int) ( $skipped_by_reason['external_worktree'] ?? 0 )
-		+ (int) ( $skipped_by_reason['protected_branch'] ?? 0 )
-		+ (int) ( $skipped_by_reason['protected_base_branch_worktree'] ?? 0 )
-		+ (int) ( $skipped_by_reason['detached_worktree'] ?? 0 )
-		+ (int) ( $skipped_by_reason['detached_protected_branch'] ?? 0 )
-		+ (int) ( $skipped_by_reason['submodule_worktree'] ?? 0 )
-		+ (int) ( $skipped_by_reason['probe_timeout'] ?? 0 )
-		+ (int) ( $skipped_by_reason['unknown_age'] ?? 0 );
-		$blocked_by_dirty_or_unpushed = (int) ( $skipped_by_reason['dirty_worktree'] ?? 0 )
-		+ (int) ( $skipped_by_reason['merged_pr_with_only_obsolete_dirty_changes'] ?? 0 )
-		+ (int) ( $skipped_by_reason['unpushed_commits'] ?? 0 );
-
-		$buckets = array(
-			'artifact_only_dirty_worktree'        => (int) ( $skipped_by_reason['artifact_only_dirty_worktree'] ?? 0 ),
-			'blocked_by_dirty_or_unpushed'        => $blocked_by_dirty_or_unpushed,
-			'needs_full_review'                   => $needs_full_review,
-			'needs_reconciliation'                => $needs_reconciliation,
-			'safe_to_remove_now'                  => $candidate_count,
-
-			// Legacy aliases retained for existing automation while callers migrate
-			// to the explicit safety buckets above.
-			'explicit_cleanup_candidates'         => (int) ( $candidates_by_signal['cleanup_eligible'] ?? 0 ),
-			'lifecycle_reconciliation_candidates' => (int) ( $skipped_by_reason['lifecycle_reconciliation_candidate'] ?? 0 ),
-			'metadata_reconciliation_candidates'  => (int) ( $skipped_by_reason['needs_metadata_reconcile'] ?? 0 ) + (int) ( $skipped_by_reason['requires_full_scan'] ?? 0 ) + (int) ( $skipped_by_reason['missing_metadata'] ?? 0 ),
-			'dirty_unpushed'                      => $blocked_by_dirty_or_unpushed,
-			'active_no_signal'                    => (int) ( $skipped_by_reason['active_no_signal'] ?? 0 ) + (int) ( $skipped_by_reason['no_inventory_cleanup_signal'] ?? 0 ),
-		);
-
-		ksort($buckets);
-		return $buckets;
+		return WorktreeCleanupClassifier::buckets($candidate_count, $candidates_by_signal, $skipped_by_reason);
 	}
 
 	/**
diff --git a/inc/Workspace/WorkspaceCleanupPlan.php b/inc/Workspace/WorkspaceCleanupPlan.php
index b6769a7..baafca5 100644
--- a/inc/Workspace/WorkspaceCleanupPlan.php
+++ b/inc/Workspace/WorkspaceCleanupPlan.php
@@ -9,6 +9,10 @@
 
 defined('ABSPATH') || exit;
 
+if ( ! class_exists(WorktreeCleanupClassifier::class) ) {
+	require_once __DIR__ . '/WorktreeCleanupClassifier.php';
+}
+
 trait WorkspaceCleanupPlan {
 
 
@@ -220,16 +224,12 @@ private function build_cleanup_plan_resolver_rows( array $skipped ): array {
 				continue;
 			}
 			$reason = (string) ( $row['reason_code'] ?? '' );
-			if ( ! in_array($reason, array( 'needs_metadata_reconcile', 'requires_full_scan', 'lifecycle_reconciliation_candidate', 'active_no_signal', 'no_inventory_cleanup_signal' ), true) ) {
+			if ( ! WorktreeCleanupClassifier::is_resolver_reason($reason) ) {
 				continue;
 			}
 
-			$resolver_type = match ( $reason ) {
-				'needs_metadata_reconcile', 'requires_full_scan' => 'metadata_reconciliation',
-				'lifecycle_reconciliation_candidate' => 'lifecycle_reconciliation',
-				default => 'merge_signal',
-			};
-			$next_action = match ( $resolver_type ) {
+			$resolver_type = WorktreeCleanupClassifier::resolver_type($reason);
+			$next_action   = match ( $resolver_type ) {
 				'metadata_reconciliation'  => 'workspace worktree reconcile-metadata --dry-run --format=json',
 				'lifecycle_reconciliation' => 'workspace worktree cleanup --dry-run --format=json',
 				default                    => 'workspace worktree cleanup --dry-run --skip-github --format=json',
diff --git a/inc/Workspace/WorktreeCleanupClassifier.php b/inc/Workspace/WorktreeCleanupClassifier.php
new file mode 100644
index 0000000..bd3ec92
--- /dev/null
+++ b/inc/Workspace/WorktreeCleanupClassifier.php
@@ -0,0 +1,153 @@
+<?php
+/**
+ * Worktree cleanup classification.
+ *
+ * Centralizes the stable reason-code to bucket mapping used by worktree cleanup
+ * reports, cleanup plans, and resolver rows. This class is intentionally
+ * non-mutating: apply paths still perform their own fresh safety revalidation.
+ *
+ * @package DataMachineCode\Workspace
+ */
+
+namespace DataMachineCode\Workspace;
+
+defined('ABSPATH') || exit;
+
+final class WorktreeCleanupClassifier {
+
+	public const BUCKET_SAFE_TO_REMOVE_NOW           = 'safe_to_remove_now';
+	public const BUCKET_NEEDS_RECONCILIATION         = 'needs_reconciliation';
+	public const BUCKET_NEEDS_FULL_REVIEW            = 'needs_full_review';
+	public const BUCKET_BLOCKED_BY_DIRTY_OR_UNPUSHED = 'blocked_by_dirty_or_unpushed';
+	public const BUCKET_ARTIFACT_ONLY_DIRTY          = 'artifact_only_dirty_worktree';
+
+	/**
+	 * Reason codes that indicate metadata/lifecycle reconciliation should run
+	 * before cleanup eligibility can be decided.
+	 *
+	 * @var string[]
+	 */
+	private const RECONCILIATION_REASONS = array(
+		'needs_metadata_reconcile',
+		'requires_full_scan',
+		'missing_metadata',
+		'lifecycle_reconciliation_candidate',
+	);
+
+	/**
+	 * Reason codes that are not deletion candidates and require human/full review.
+	 *
+	 * @var string[]
+	 */
+	private const FULL_REVIEW_REASONS = array(
+		'active_no_signal',
+		'no_inventory_cleanup_signal',
+		'no_merge_signal',
+		'github_unknown',
+		'external_worktree',
+		'protected_branch',
+		'protected_base_branch_worktree',
+		'detached_worktree',
+		'detached_protected_branch',
+		'submodule_worktree',
+		'probe_timeout',
+		'unknown_age',
+	);
+
+	/**
+	 * Reason codes blocked by uncommitted or unpushed user work.
+	 *
+	 * @var string[]
+	 */
+	private const DIRTY_OR_UNPUSHED_REASONS = array(
+		'dirty_worktree',
+		'merged_pr_with_only_obsolete_dirty_changes',
+		'unpushed_commits',
+	);
+
+	/**
+	 * Reason codes that can generate read-only resolver plan rows.
+	 *
+	 * @var string[]
+	 */
+	private const RESOLVER_REASONS = array(
+		'needs_metadata_reconcile',
+		'requires_full_scan',
+		'lifecycle_reconciliation_candidate',
+		'active_no_signal',
+		'no_inventory_cleanup_signal',
+	);
+
+	/**
+	 * Classify one skipped reason code into a stable high-level cleanup bucket.
+	 */
+	public static function bucket_for_reason( string $reason_code ): string {
+		if ( 'artifact_only_dirty_worktree' === $reason_code ) {
+			return self::BUCKET_ARTIFACT_ONLY_DIRTY;
+		}
+
+		if ( in_array($reason_code, self::DIRTY_OR_UNPUSHED_REASONS, true) ) {
+			return self::BUCKET_BLOCKED_BY_DIRTY_OR_UNPUSHED;
+		}
+
+		if ( in_array($reason_code, self::RECONCILIATION_REASONS, true) ) {
+			return self::BUCKET_NEEDS_RECONCILIATION;
+		}
+
+		if ( in_array($reason_code, self::FULL_REVIEW_REASONS, true) ) {
+			return self::BUCKET_NEEDS_FULL_REVIEW;
+		}
+
+		return self::BUCKET_NEEDS_FULL_REVIEW;
+	}
+
+	/**
+	 * Build stable high-level bucket counts from cleanup summary primitives.
+	 *
+	 * @param  int               $candidate_count      Candidate row count.
+	 * @param  array<string,int> $candidates_by_signal Candidate signal counts.
+	 * @param  array<string,int> $skipped_by_reason    Skipped reason counts.
+	 * @return array<string,int>
+	 */
+	public static function buckets( int $candidate_count, array $candidates_by_signal, array $skipped_by_reason ): array {
+		$buckets = array(
+			self::BUCKET_ARTIFACT_ONLY_DIRTY          => 0,
+			self::BUCKET_BLOCKED_BY_DIRTY_OR_UNPUSHED => 0,
+			self::BUCKET_NEEDS_FULL_REVIEW            => 0,
+			self::BUCKET_NEEDS_RECONCILIATION         => 0,
+			self::BUCKET_SAFE_TO_REMOVE_NOW           => $candidate_count,
+		);
+
+		foreach ( $skipped_by_reason as $reason_code => $count ) {
+			$bucket             = self::bucket_for_reason( (string) $reason_code );
+			$buckets[ $bucket ] = ( $buckets[ $bucket ] ?? 0 ) + (int) $count;
+		}
+
+		$buckets['explicit_cleanup_candidates']         = (int) ( $candidates_by_signal['cleanup_eligible'] ?? 0 );
+		$buckets['lifecycle_reconciliation_candidates'] = (int) ( $skipped_by_reason['lifecycle_reconciliation_candidate'] ?? 0 );
+		$buckets['metadata_reconciliation_candidates']  = (int) ( $skipped_by_reason['needs_metadata_reconcile'] ?? 0 ) + (int) ( $skipped_by_reason['requires_full_scan'] ?? 0 ) + (int) ( $skipped_by_reason['missing_metadata'] ?? 0 );
+		$buckets['dirty_unpushed']                      = $buckets[ self::BUCKET_BLOCKED_BY_DIRTY_OR_UNPUSHED ];
+		$buckets['active_no_signal']                    = (int) ( $skipped_by_reason['active_no_signal'] ?? 0 ) + (int) ( $skipped_by_reason['no_inventory_cleanup_signal'] ?? 0 );
+
+		ksort($buckets);
+		return $buckets;
+	}
+
+	/**
+	 * Whether a skip row reason can produce a read-only resolver plan row.
+	 */
+	public static function is_resolver_reason( string $reason_code ): bool {
+		return in_array($reason_code, self::RESOLVER_REASONS, true);
+	}
+
+	/**
+	 * Return resolver type for a skip reason.
+	 */
+	public static function resolver_type( string $reason_code ): string {
+		return match ( $reason_code ) {
+			'needs_metadata_reconcile', 'requires_full_scan' => 'metadata_reconciliation',
+			'lifecycle_reconciliation_candidate' => 'lifecycle_reconciliation',
+			default => 'merge_signal',
+		};
+	}
+}
diff --git a/tests/smoke-worktree-cleanup-classifier.php b/tests/smoke-worktree-cleanup-classifier.php
new file mode 100644
index 0000000..5e5b5c2
--- /dev/null
+++ b/tests/smoke-worktree-cleanup-classifier.php
@@ -0,0 +1,85 @@
+<?php
+/**
+ * Pure-PHP smoke test for worktree cleanup classification buckets.
+ *
+ * Run: php tests/smoke-worktree-cleanup-classifier.php
+ */
+
+declare( strict_types=1 );
+
+if ( ! defined('ABSPATH') ) {
+	define('ABSPATH', __DIR__ . '/');
+}
+
+require __DIR__ . '/../inc/Workspace/WorktreeCleanupClassifier.php';
+
+use DataMachineCode\Workspace\WorktreeCleanupClassifier;
+
+$failures = array();
+$total    = 0;
+$assert   = function ( string $label, bool $condition ) use ( &$failures, &$total ): void {
+	++$total;
+	if ( $condition ) {
+		echo "  ok {$label}\n";
+		return;
+	}
+
+	$failures[] = $label;
+	echo "  fail {$label}\n";
+};
+
+echo "Worktree cleanup classifier - smoke\n";
+
+$assert('metadata skip maps to reconciliation', WorktreeCleanupClassifier::BUCKET_NEEDS_RECONCILIATION === WorktreeCleanupClassifier::bucket_for_reason('needs_metadata_reconcile'));
+$assert('lifecycle skip maps to reconciliation', WorktreeCleanupClassifier::BUCKET_NEEDS_RECONCILIATION === WorktreeCleanupClassifier::bucket_for_reason('lifecycle_reconciliation_candidate'));
+$assert('dirty skip maps to dirty blocker', WorktreeCleanupClassifier::BUCKET_BLOCKED_BY_DIRTY_OR_UNPUSHED === WorktreeCleanupClassifier::bucket_for_reason('dirty_worktree'));
+$assert('unpushed skip maps to dirty blocker', WorktreeCleanupClassifier::BUCKET_BLOCKED_BY_DIRTY_OR_UNPUSHED === WorktreeCleanupClassifier::bucket_for_reason('unpushed_commits'));
+$assert('artifact-only dirty has distinct bucket', WorktreeCleanupClassifier::BUCKET_ARTIFACT_ONLY_DIRTY === WorktreeCleanupClassifier::bucket_for_reason('artifact_only_dirty_worktree'));
+$assert('active/no-signal maps to full review', WorktreeCleanupClassifier::BUCKET_NEEDS_FULL_REVIEW === WorktreeCleanupClassifier::bucket_for_reason('active_no_signal'));
+$assert('unknown reasons fail into full review', WorktreeCleanupClassifier::BUCKET_NEEDS_FULL_REVIEW === WorktreeCleanupClassifier::bucket_for_reason('future_unknown_reason'));
+
+$buckets = WorktreeCleanupClassifier::buckets(
+	2,
+	array(
+		'cleanup_eligible' => 1,
+	),
+	array(
+		'needs_metadata_reconcile'                    => 2,
+		'requires_full_scan'                          => 1,
+		'lifecycle_reconciliation_candidate'          => 1,
+		'active_no_signal'                            => 3,
+		'github_unknown'                              => 1,
+		'dirty_worktree'                              => 1,
+		'merged_pr_with_only_obsolete_dirty_changes'  => 1,
+		'unpushed_commits'                            => 1,
+		'artifact_only_dirty_worktree'                => 1,
+	)
+);
+
+$assert('bucket counts safe candidates', 2 === (int) ( $buckets['safe_to_remove_now'] ?? -1 ));
+$assert('bucket counts reconciliation reasons', 4 === (int) ( $buckets['needs_reconciliation'] ?? -1 ));
+$assert('bucket counts full review reasons', 4 === (int) ( $buckets['needs_full_review'] ?? -1 ));
+$assert('bucket counts dirty/unpushed blockers', 3 === (int) ( $buckets['blocked_by_dirty_or_unpushed'] ?? -1 ));
+$assert('bucket counts artifact-only dirty separately', 1 === (int) ( $buckets['artifact_only_dirty_worktree'] ?? -1 ));
+$assert('legacy explicit cleanup alias remains', 1 === (int) ( $buckets['explicit_cleanup_candidates'] ?? -1 ));
+$assert('legacy metadata alias remains', 3 === (int) ( $buckets['metadata_reconciliation_candidates'] ?? -1 ));
+$assert('legacy lifecycle alias remains', 1 === (int) ( $buckets['lifecycle_reconciliation_candidates'] ?? -1 ));
+$assert('legacy active alias remains', 3 === (int) ( $buckets['active_no_signal'] ?? -1 ));
+$assert('legacy dirty alias remains', 3 === (int) ( $buckets['dirty_unpushed'] ?? -1 ));
+
+$assert('metadata rows can produce resolver rows', WorktreeCleanupClassifier::is_resolver_reason('needs_metadata_reconcile'));
+$assert('dirty rows do not produce resolver rows', ! WorktreeCleanupClassifier::is_resolver_reason('dirty_worktree'));
+$assert('metadata resolver type is stable', 'metadata_reconciliation' === WorktreeCleanupClassifier::resolver_type('requires_full_scan'));
+$assert('lifecycle resolver type is stable', 'lifecycle_reconciliation' === WorktreeCleanupClassifier::resolver_type('lifecycle_reconciliation_candidate'));
+$assert('active resolver type is merge signal', 'merge_signal' === WorktreeCleanupClassifier::resolver_type('active_no_signal'));
+
+if ( ! empty($failures) ) {
+	echo "\nFAIL: " . count($failures) . " assertion(s) failed out of {$total}\n";
+	foreach ( $failures as $failure ) {
+		echo "  - {$failure}\n";
+	}
+	exit(1);
+}
+
+echo "\nOK ({$total} assertions)\n";
+exit(0);