feat: implement task dependencies with validation and update handling

backend/app/core/agent_auth.py

@@ -22,9 +22,7 @@ class AgentAuthContext:
 
 
 async def _find_agent_for_token(session: AsyncSession, token: str) -> Agent | None:
-    agents = list(
-        await session.exec(select(Agent).where(col(Agent.agent_token_hash).is_not(None)))
-    )
+    agents = list(await session.exec(select(Agent).where(col(Agent.agent_token_hash).is_not(None))))
     for agent in agents:
         if agent.agent_token_hash and verify_agent_token(token, agent.agent_token_hash):
             return agent

backend/app/core/durations.py

@@ -34,4 +34,3 @@ def parse_every_to_seconds(value: str) -> int:
     if seconds > 60 * 60 * 24 * 365 * 10:
         raise ValueError("Schedule is too large (max 10 years).")
     return seconds
-