Mark US-023 as complete in prd.json

- Move US-023 from inProgressStories to completedStories
- All acceptance criteria met and verified

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: Yeachan-Heo

prd.json

@@ -333,8 +333,8 @@
   ],
   "metadata": {
     "lastUpdated": "2026-04-16",
-    "completedStories": ["US-001", "US-002", "US-003", "US-004", "US-005", "US-006", "US-007", "US-008", "US-009", "US-010", "US-011", "US-012", "US-013", "US-014", "US-015", "US-016", "US-017", "US-018", "US-019", "US-020", "US-021", "US-022"],
-    "inProgressStories": ["US-023"],
+    "completedStories": ["US-001", "US-002", "US-003", "US-004", "US-005", "US-006", "US-007", "US-008", "US-009", "US-010", "US-011", "US-012", "US-013", "US-014", "US-015", "US-016", "US-017", "US-018", "US-019", "US-020", "US-021", "US-022", "US-023"],
+    "inProgressStories": [],
     "totalStories": 23,
     "status": "in_progress"
   }