feat: implement task creation endpoint for board leads and enhance board chat functionality

backend/app/api/agent.py

@@ -21,13 +21,20 @@ from app.integrations.openclaw_gateway import (
     send_message,
 )
 from app.models.agents import Agent
+from app.models.tasks import Task
 from app.models.boards import Board
 from app.models.gateways import Gateway
 from app.schemas.approvals import ApprovalCreate, ApprovalRead
 from app.schemas.board_memory import BoardMemoryCreate, BoardMemoryRead
 from app.schemas.board_onboarding import BoardOnboardingRead
 from app.schemas.boards import BoardRead
-from app.schemas.tasks import TaskCommentCreate, TaskCommentRead, TaskRead, TaskUpdate
+from app.schemas.tasks import (
+    TaskCommentCreate,
+    TaskCommentRead,
+    TaskCreate,
+    TaskRead,
+    TaskUpdate,
+)
 from app.schemas.agents import AgentCreate, AgentHeartbeatCreate, AgentNudge, AgentRead
 from app.services.activity_log import record_activity
 
@@ -120,6 +127,55 @@ def list_tasks(
     )
 
 
+@router.post("/boards/{board_id}/tasks", response_model=TaskRead)
+def create_task(
+    payload: TaskCreate,
+    board: Board = Depends(get_board_or_404),
+    session: Session = Depends(get_session),
+    agent_ctx: AgentAuthContext = Depends(get_agent_auth_context),
+) -> TaskRead:
+    _guard_board_access(agent_ctx, board)
+    if not agent_ctx.agent.is_board_lead:
+        raise HTTPException(status_code=status.HTTP_403_FORBIDDEN)
+    tasks_api.validate_task_status(payload.status)
+    task = Task.model_validate(payload)
+    task.board_id = board.id
+    task.auto_created = True
+    task.auto_reason = f"lead_agent:{agent_ctx.agent.id}"
+    if task.assigned_agent_id:
+        agent = session.get(Agent, task.assigned_agent_id)
+        if agent is None:
+            raise HTTPException(status_code=status.HTTP_404_NOT_FOUND)
+        if agent.is_board_lead:
+            raise HTTPException(
+                status_code=status.HTTP_403_FORBIDDEN,
+                detail="Board leads cannot assign tasks to themselves.",
+            )
+        if agent.board_id and agent.board_id != board.id:
+            raise HTTPException(status_code=status.HTTP_409_CONFLICT)
+    session.add(task)
+    session.commit()
+    session.refresh(task)
+    record_activity(
+        session,
+        event_type="task.created",
+        task_id=task.id,
+        message=f"Task created by lead: {task.title}.",
+        agent_id=agent_ctx.agent.id,
+    )
+    session.commit()
+    if task.assigned_agent_id:
+        assigned_agent = session.get(Agent, task.assigned_agent_id)
+        if assigned_agent:
+            tasks_api._notify_agent_on_task_assign(
+                session=session,
+                board=board,
+                task=task,
+                agent=assigned_agent,
+            )
+    return task
+
+
 @router.patch("/boards/{board_id}/tasks/{task_id}", response_model=TaskRead)
 def update_task(
     payload: TaskUpdate,