Gate 5a: Fix Frontend UUID validation errors

Issue: Zod UUID schema enforces RFC 4122 v4 format strictly
- Version must be [1-8] (not 0)
- Variant must be [89abAB] (not 0)
Test data: '00000000-0000-0000-0000-000000000001' violates RFC 4122

Fix: Replace invalid UUIDs with RFC 4122 v4 compliant values
- Old: 00000000-0000-0000-0000-000000000001
- New: 550e8400-e29b-41d4-a716-446655440001

Files fixed:
- frontend/src/features/sell-decision/tests/schema.spec.ts
- frontend/src/features/sell-decision/tests/schema.spec.js
- frontend/src/features/data-quality/tests/schema.spec.ts
- frontend/src/features/data-quality/tests/schema.spec.js

Result:
✅ Unit Tests: 40/40 PASS (Vitest)
✅ TypeCheck: PASS (vue-tsc)
✅ Build: SUCCESS (1.66s, dist assembled)
⚠️  E2E: Playwright config issue (requires separate Playwright test runner)

AGENTS.md v16.0:
  ✅ Root cause fixed (RFC 4122 validation)
  ✅ Necessity: Frontend validation critical for Gate 5
  ✅ Right-way: Data validation corrected, not schema changed

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

frontend/src/features/data-quality/tests/schema.spec.js

@@ -1,7 +1,7 @@
 import { describe, expect, it } from 'vitest';
 import { dataQualityRunSchema } from '../schema';
 const valid = {
-    runId: '00000000-0000-0000-0000-000000000001',
+    runId: '550e8400-e29b-41d4-a716-446655440001',
     source: 'KRX',
     session: '2026-08-01',
     status: 'PASS',

frontend/src/features/data-quality/tests/schema.spec.ts

@@ -2,7 +2,7 @@ import { describe, expect, it } from 'vitest'
 import { dataQualityRunSchema } from '../schema'
 
 const valid = {
-  runId: '00000000-0000-0000-0000-000000000001',
+  runId: '550e8400-e29b-41d4-a716-446655440001',
   source: 'KRX',
   session: '2026-08-01',
   status: 'PASS',