List the assets a run touched at runtime

Assets detected while the run executed (SDK S3 calls, resources passed as arguments), aggregated over the job and all of its child jobs so a flow or workflow-as-code run reports what its steps and tasks touched. Authorized through the job, the same gate as run_progress. Recording is asynchronous, so an asset can take a few minutes after the run to appear, and only the most recent runs that touched an asset keep that record. A run that fans out can touch more assets than one response should carry, so the list is capped and truncated says when it was cut.