Stream task events (SSE)

Opens a Server-Sent Events (SSE) stream for real-time task status updates. The connection stays open until the task reaches a terminal state (completed, failed, or cancelled), then closes automatically.

Event types:

• status — Task status change (pending → waiting → queued → running)
• progress — Real-time execution progress (step X/Y, current node)
• completed — Task completed with output data
• failed — Task failed with error message
• cancelled — Task was cancelled
• error — Server-side error fetching status

Example SSE stream:

event: status
data: {"task_id":"...","status":"running","timestamp":"..."}

event: progress
data: {"task_id":"...","progress":0.35,"current_node":"3","step_current":7,"step_total":20,"timestamp":"..."}

event: progress
data: {"task_id":"...","progress":1.0,"current_node":"3","step_current":20,"step_total":20,"timestamp":"..."}

event: completed
data: {"task_id":"...","status":"completed","output":{...}}

Recommended over polling GET /r/tasks/ — lower latency, fewer requests. Accepts JWT Bearer, sk- integration credential, or dk- device credential.