report and cache the endpoint tray version

The agent already reported agentversion but the interactive tray app, which ships and updates independently, had no reported version. The agent now reads the tray exe file version and reports it as trayversion; EndpointState caches it (migration 0011) and the Fleet card surfaces it beside Agent. The tray csproj gains an explicit Version so the file version is stamped. Groundwork for per-PC version surfacing and push-update targeting.

plugins/endpoints/plugin.py

@@ -49,7 +49,7 @@ CURATED_EVENT_IDS = frozenset(EVENT_CATALOG)
 KNOWN_PAYLOAD_KEYS = frozenset({
     'hostname', 'adopt', 'loggedinuser', 'serialnumber', 'pctype',
     'machinenumber', 'vendorname', 'modelnumber', 'osname', 'ipaddress',
-    'agentversion', 'lastboottime', 'uptimeseconds', 'idleseconds',
+    'agentversion', 'trayversion', 'lastboottime', 'uptimeseconds', 'idleseconds',
     'cpupercent', 'memorypercent', 'services', 'ports', 'interfaces',
     'scheduledtasks', 'applications', 'events',
 })
@@ -575,6 +575,7 @@ class EndpointsPlugin(BasePlugin):
                     },
                     'loggedinuser': {'type': 'string'},
                     'agentversion': {'type': 'string'},
+                    'trayversion': {'type': 'string'},
                     'lastboottime': {'type': 'string', 'format': 'date-time'},
                     'uptimeseconds': {'type': 'integer'},
                     'idleseconds': {'type': 'integer'},
@@ -786,6 +787,8 @@ class EndpointsPlugin(BasePlugin):
             state.loggedinuser = payload.get('loggedinuser')
         if 'agentversion' in payload:
             state.agentversion = payload.get('agentversion')
+        if 'trayversion' in payload:
+            state.trayversion = payload.get('trayversion')
         if 'lastboottime' in payload:
             state.lastboottime = _parse_dt(payload.get('lastboottime'))
         if 'uptimeseconds' in payload: