commit missing openenv.yaml and server.py changes

openenv.yaml

@@ -59,16 +59,19 @@ tasks:
     difficulty: easy
     max_steps: 5
     description: Fix a single syntax error. Error hint provided.
+    grader: sql_env.grader.grade
 
   - name: medium
     difficulty: medium
     max_steps: 5
     description: Fix multiple errors across keywords and clauses. No hint.
+    grader: sql_env.grader.grade
 
   - name: hard
     difficulty: hard
     max_steps: 4
     description: Fix many errors in complex multi-join queries. Schema provided. No hint.
+    grader: sql_env.grader.grade
 
 endpoints:
   reset: POST /reset

sql_env/server.py

@@ -99,36 +99,36 @@ async def health():
 
 @app.get("/tasks")
 async def list_tasks():
-    """Return graded tasks in openenv validator format."""
     return {
         "tasks": [
             {
                 "name": "easy",
-                "difficulty": "easy", 
+                "difficulty": "easy",
                 "description": "Fix a single syntax error. Error hint provided.",
                 "max_steps": 5,
                 "has_grader": True,
-                "grader": "grade",
+                "grader": "sql_env.grader.grade",
             },
             {
                 "name": "medium",
                 "difficulty": "medium",
-                "description": "Fix multiple errors across keywords and clauses. No hint.",
+                "description": "Fix multiple errors. No hint.",
                 "max_steps": 5,
                 "has_grader": True,
-                "grader": "grade",
+                "grader": "sql_env.grader.grade",
             },
             {
                 "name": "hard",
                 "difficulty": "hard",
-                "description": "Fix many errors in complex multi-join queries. Schema provided.",
+                "description": "Fix complex multi-join queries. Schema provided.",
                 "max_steps": 4,
                 "has_grader": True,
-                "grader": "grade",
+                "grader": "sql_env.grader.grade",
             },
         ]
     }
 
+
 @app.get("/")
 async def root():
     return {