fix: use full invocation path for dynamic component debugRenderTree names

Use the full debugLabel as the component name so users see exactly
how the component was invoked:

- `<this.Foo>` → name: "this.Foo"
- `<@Greeting>` → name: "@Greeting"

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: NullVoxPopuli

packages/@glimmer-workspace/integration-tests/test/debug-render-tree-test.ts

@@ -165,7 +165,7 @@ class DebugRenderTreeTest extends RenderTest {
 
     this.assert.strictEqual(
       componentNode?.name,
-      'HelloWorld',
+      'this.HelloWorld',
       `dynamic <this.X> component name (got "${componentNode?.name}")`
     );
   }
@@ -185,10 +185,9 @@ class DebugRenderTreeTest extends RenderTest {
 
     this.assert.ok(componentNode, 'found a component child node');
 
-    // For <@Greeting>, the invocation-site name "Greeting" is used
     this.assert.strictEqual(
       componentNode?.name,
-      'Greeting',
+      '@Greeting',
       `dynamic <@X> component name (got "${componentNode?.name}")`
     );
   }

packages/@glimmer/runtime/lib/compiled/opcodes/component.ts

@@ -186,8 +186,7 @@ APPEND_OPCODES.add(VM_RESOLVE_DYNAMIC_COMPONENT_OP, (vm, { op1: _isStrict }) =>
   if (DEBUG && !isCurriedValue(definition) && !definition.resolvedName && !definition.debugName) {
     let debugLabel = ref.debugLabel;
     if (debugLabel) {
-      // Extract the last segment of the path (e.g. "this.Foo" → "Foo", "Foo" → "Foo")
-      definition.debugName = debugLabel.split('.').pop();
+      definition.debugName = debugLabel;
     }
   }
 
@@ -229,12 +228,7 @@ APPEND_OPCODES.add(VM_RESOLVE_CURRIED_COMPONENT_OP, (vm) => {
   if (DEBUG && definition && !isCurriedValue(definition) && !definition.resolvedName && !definition.debugName) {
     let debugLabel = ref.debugLabel;
     if (debugLabel) {
-      // Extract the component name from the arg path (e.g. "@Greeting" → "Greeting")
-      let name = debugLabel.split('.').pop()!;
-      if (name.startsWith('@')) {
-        name = name.slice(1);
-      }
-      definition.debugName = name;
+      definition.debugName = debugLabel;
     }
   }