Covers v20r1 identity (pid 790059->790060, zinc uv_flight13_v20r1, lease /tmp/flight13_hl_testnet_single_writer.lock), config chain, FORCE_ENGAGE firehose (u=exec_urgency, capacity=1, 30/hr SHORT 14 syms), exit/max-hold, venue-truth via unsigned HL /info, monitoring runbook, relaunch/stop procedures, and troubleshooting (incl. sub-$10 residual dust and stale HL metadata). Testnet-only; no system code/data modified.