Get Run Status

Lightweight run status for progress polling.

Returns only the volatile, frequently-changing fields: status, step counts (total_steps, finished_steps), timestamps (started_at, completed_at, paused_at, pause_requested_at), usage_summary, error, and has_export. The definition snapshot is intentionally omitted to keep response size small.

Recommended polling pattern: call GET /runs/{run_id} once after starting a run to load the immutable definition snapshot and initial metadata, then poll this endpoint until status reaches a terminal value (completed, failed, or cancelled). has_export becoming true signals that a download is ready via GET /runs/{run_id}/download.

The transient pausing state is observable here: status == "running" with pause_requested_at set means a pause is in progress but the current wave has not yet finished draining.