Create a helper function to poll for agent deployment readiness

[ommistry2914]

Summary

• Add synchronous and asynchronous helpers to AgentsResource and AsyncAgentsResource :

        - wait_for_deployment(uuid, *, timeout=120.0, interval=2.0, raise_on_failed=True)
        - async def wait_for_deployment(...)
  

• These poll retrieve() until the agent deployment reaches STATUS_RUNNING, returns the AgentRetrieveResponse on success, and optionally raises on terminal failure states.

Details

• Polling defaults: timeout = 120s, interval = 2s.

• Terminal failure states treated as errors: STATUS_FAILED, STATUS_UNDEPLOYMENT_FAILED, STATUS_DELETED.

• If raise_on_failed=True (default), a RuntimeError is raised when a terminal failure state is observed.

• If raise_on_failed=False, the final AgentRetrieveResponse is returned so callers can inspect the state themselves.

• Returns the same AgentRetrieveResponse object produced by retrieve() for consistency.

fixes #40

[bbatha]

Thank you for your contribution, however this is a dupe of #56