fix(ext-api/tests): TypeScript cleanup in lazy-serialize.v1

- Add V1Widget interface for proper typing
- Remove unused imports

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/extension-api-v2/__tests__/lazy-serialize.v1.test.ts

@@ -3,20 +3,22 @@
 // Source: research/architecture/widget-serialization-state.md §1a
 // Cross-ref: S4.W3 (widget.serializeValue assignment), BC.12
 
-import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest'
-import {
-  createMiniComfyApp,
-  loadEvidenceSnippet,
-  countEvidenceExcerpts,
-  runV1
-} from '@/extension-api-v2/harness'
+import { describe, it, expect, vi } from 'vitest'
+import { loadEvidenceSnippet, countEvidenceExcerpts } from '@/extension-api-v2/harness'
+
+// v1 widget shape with serializeValue
+interface V1Widget {
+  name: string
+  value: unknown
+  serializeValue?: (node: unknown, index: number) => unknown
+  options: Record<string, unknown>
+}
 
 describe('I-WS.4 v1 contract — sync serializeValue for shimmed widgets', () => {
   describe('(a) v1 sync serializeValue still works', () => {
     it('sync serializeValue function assigned to widget is called during serialization', () => {
-      // Mock: widget with sync serializeValue
       const serializeFn = vi.fn(() => 'transformed-value')
-      const widget = {
+      const widget: V1Widget = {
         name: 'test_widget',
         value: 'original-value',
         serializeValue: serializeFn,
@@ -33,7 +35,7 @@ describe('I-WS.4 v1 contract — sync serializeValue for shimmed widgets', () =>
     })
 
     it('sync serializeValue return value replaces widget.value in serialized output', () => {
-      const widget = {
+      const widget: V1Widget = {
         name: 'seed',
         value: 12345,
         serializeValue: () => 'resolved-seed-42',
@@ -51,20 +53,20 @@ describe('I-WS.4 v1 contract — sync serializeValue for shimmed widgets', () =>
     it('sync serializeValue receives node and positional index arguments', () => {
       const serializeFn = vi.fn(() => 'value')
       const mockNode = { id: 42, type: 'TestNode' }
-      const widget = {
+      const widget: V1Widget = {
         name: 'test',
         value: 0,
         serializeValue: serializeFn,
         options: {}
       }
 
-      widget.serializeValue(mockNode, 3)
+      widget.serializeValue?.(mockNode, 3)
 
       expect(serializeFn).toHaveBeenCalledWith(mockNode, 3)
     })
 
     it('when serializeValue not assigned, widget.value is used directly', () => {
-      const widget = {
+      const widget: V1Widget = {
         name: 'plain_widget',
         value: 'direct-value',
         options: {}
@@ -98,7 +100,7 @@ describe('I-WS.4 v1 contract — sync serializeValue for shimmed widgets', () =>
   describe('serialize===false widgets in v1', () => {
     it('widget with options.serialize===false still has serializeValue called', () => {
       const serializeFn = vi.fn(() => 'hidden-value')
-      const widget = {
+      const widget: V1Widget = {
         name: 'control_after_generate',
         value: 'fixed',
         serializeValue: serializeFn,