fix root endpoint to list all 5 tasks

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

dataqa_env/server/app.py

@@ -25,7 +25,7 @@ def root():
     return {
         "name": "DataQA Environment",
         "description": "Two-phase data quality assurance environment: identify issues + propose fixes",
-        "tasks": ["easy", "medium", "hard"],
+        "tasks": ["easy", "medium", "hard", "alignment", "moderation"],
         "endpoints": ["/health", "/reset", "/step", "/state"],
     }