The endpoint agent already reports an installed-software list (SBOM), but ingress dropped it: the collector schema had no entry for it and there was nowhere to store it, so operators could not see what is installed on a PC.
Persist it as a per-asset snapshot in a new endpointapplications table, replaced on every report (current inventory is what operators ask for, not install history). Add applications to the collector schema and KNOWN_PAYLOAD_KEYS so ingress stops discarding it, a read route for the raw collection, and a collapsed-by-default Installed software panel to surface it. appid is nullable groundwork for a future Managed Applications link; no matcher is wired yet.
