docs: use pnpm exec tsx --test in address notes plan

Align frontend unit test commands with existing web-admin plan conventions.

Co-authored-by: Cursor <cursoragent@cursor.com>

docs/superpowers/plans/2026-09-02-pl-transport-address-notes-fill.md

@@ -73,7 +73,7 @@ describe('resolveAddressNotesFill', () => {
 Run:
 
 ```bash
-cd web-admin && node --import tsx --test src/utils/pl-address-notes-fill.test.ts
+cd web-admin && pnpm exec tsx --test src/utils/pl-address-notes-fill.test.ts
 ```
 
 Expected: FAIL（模块不存在或导出缺失）
@@ -541,7 +541,7 @@ Expected: PASS
 - [ ] **Step 2: 前端单测**
 
 ```bash
-cd web-admin && node --import tsx --test src/utils/pl-address-notes-fill.test.ts
+cd web-admin && pnpm exec tsx --test src/utils/pl-address-notes-fill.test.ts
 ```
 
 Expected: PASS