feat: enhance agent orchestration, knowledge flow and UI refinements

backend/app/schemas/skill.py

@@ -1,3 +1,4 @@
+from datetime import datetime
 from pydantic import BaseModel
 from typing import Optional
 
@@ -6,7 +7,7 @@ class SkillCreate(BaseModel):
     name: str
     description: Optional[str] = None
     instructions: str
-    agent_type: str  # master/planner/executor/librarian/analyst
+    agent_type: str  # master/schedule_planner/executor/librarian/analyst
     tools: list[str] = []
     required_context: list[str] = []
     output_format: Optional[str] = None
@@ -39,10 +40,11 @@ class SkillOut(BaseModel):
     required_context: list[str]
     output_format: Optional[str]
     visibility: str
+    is_builtin: bool
     team_id: Optional[str]
     is_active: bool
     owner_id: str
-    created_at: str
-    updated_at: str
+    created_at: datetime
+    updated_at: datetime
 
     model_config = {"from_attributes": True}