- capture-manager: remove dead legacy deltacast FIFO video path (FC_SLOT_ID
is now always set by node-agent, framecache mandatory on all SDI nodes)
- node-agent: correct stale comment about legacy FIFO fallback
- onboard-node.sh: harden detect_sdi (device-node checks, not just lspci) and
persist COMPOSE_PROFILES so framecache survives every redeploy on SDI nodes
- remove committed capture.js.bak
Root cause of this session's outage: zampp3 came up without the capture
compose profile, so framecache never started; the bridge published to shm
with no consumer and recorders showed 'receiving' with no real capture.