fix: harden unicode safety checks

skills/tdd-workflow/SKILL.md

@@ -367,39 +367,39 @@ npm run test:coverage
 
 ## Common Testing Mistakes to Avoid
 
-### ❌ WRONG: Testing Implementation Details
+### FAIL: WRONG: Testing Implementation Details
 ```typescript
 // Don't test internal state
 expect(component.state.count).toBe(5)
 ```
 
-### ✅ CORRECT: Test User-Visible Behavior
+### PASS: CORRECT: Test User-Visible Behavior
 ```typescript
 // Test what users see
 expect(screen.getByText('Count: 5')).toBeInTheDocument()
 ```
 
-### ❌ WRONG: Brittle Selectors
+### FAIL: WRONG: Brittle Selectors
 ```typescript
 // Breaks easily
 await page.click('.css-class-xyz')
 ```
 
-### ✅ CORRECT: Semantic Selectors
+### PASS: CORRECT: Semantic Selectors
 ```typescript
 // Resilient to changes
 await page.click('button:has-text("Submit")')
 await page.click('[data-testid="submit-button"]')
 ```
 
-### ❌ WRONG: No Test Isolation
+### FAIL: WRONG: No Test Isolation
 ```typescript
 // Tests depend on each other
 test('creates user', () => { /* ... */ })
 test('updates same user', () => { /* depends on previous test */ })
 ```
 
-### ✅ CORRECT: Independent Tests
+### PASS: CORRECT: Independent Tests
 ```typescript
 // Each test sets up its own data
 test('creates user', () => {