fix: Scope interfaces implemented by enums

`NameStmtPrefixer` only prefixed names whose parent node was in an
allow-list of supported node types. That list contained `Class_` and
`Interface_` but not `Enum_`, so the interface names in an
`enum X implements Y` declaration were left untouched while the matching
`use` statement was prefixed, producing code that referenced a
non-existent (unprefixed) interface.

Add `Enum_` to the supported parent nodes so enum `implements` clauses
are scoped exactly like class ones.

Closes #1119

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: Daniel Maier

specs/enum/declaration.php

@@ -96,7 +96,60 @@ enum Status implements HasColor {
 
         namespace Humbug;
 
-        enum Status implements \HasColor
+        enum Status implements HasColor
+        {
+            case DRAFT = 'draft';
+            case PUBLISHED = 'published';
+            case ARCHIVED = 'archived';
+        }
+
+        PHP,
+
+    'enum implementing an interface imported via a use statement' => <<<'PHP'
+        <?php
+
+        namespace Acme;
+
+        use App\Contracts\HasColor;
+
+        enum Status: string implements HasColor {
+            case DRAFT = 'draft';
+            case PUBLISHED = 'published';
+            case ARCHIVED = 'archived';
+        }
+
+        ----
+        <?php
+
+        namespace Humbug\Acme;
+
+        use Humbug\App\Contracts\HasColor;
+        enum Status : string implements HasColor
+        {
+            case DRAFT = 'draft';
+            case PUBLISHED = 'published';
+            case ARCHIVED = 'archived';
+        }
+
+        PHP,
+
+    'enum implementing an interface referenced via a FQ name' => <<<'PHP'
+        <?php
+
+        namespace Acme;
+
+        enum Status: string implements \App\Contracts\HasColor {
+            case DRAFT = 'draft';
+            case PUBLISHED = 'published';
+            case ARCHIVED = 'archived';
+        }
+
+        ----
+        <?php
+
+        namespace Humbug\Acme;
+
+        enum Status : string implements \Humbug\App\Contracts\HasColor
         {
             case DRAFT = 'draft';
             case PUBLISHED = 'published';

src/PhpParser/NodeVisitor/NameStmtPrefixer.php

@@ -40,6 +40,7 @@
 use PhpParser\Node\Stmt\Catch_;
 use PhpParser\Node\Stmt\Class_;
 use PhpParser\Node\Stmt\ClassMethod;
+use PhpParser\Node\Stmt\Enum_;
 use PhpParser\Node\Stmt\Function_;
 use PhpParser\Node\Stmt\Interface_;
 use PhpParser\Node\Stmt\Property;
@@ -79,6 +80,7 @@ final class NameStmtPrefixer extends NodeVisitorAbstract
         ClassConstFetch::class,
         ClassMethod::class,
         Closure::class,
+        Enum_::class,
         FuncCall::class,
         Function_::class,
         Instanceof_::class,