Add server launch QA gate

Docs/QA/MvpQaGates.md

@@ -23,3 +23,29 @@ Required evidence:
 - Any full visual pass stores notes under `Saved\VisualQA\InvestorDemo`.
 
 This gate is client-only. It does not require multiplayer server deployment.
+
+## Server Launch
+
+The server launch gate proves the MVP gameplay host can start the current
+server-compatible package and expose the Unreal gameplay port.
+
+Current MVP launch path:
+
+- Prefer the true Linux dedicated-server target when a server-capable Unreal
+  engine is available:
+  `Scripts/BuildLinuxDedicatedServer-Windows.bat`
+- Until then, use the binary-engine fallback:
+  `Scripts/PackageLinuxGameServerFallback-Windows.bat`
+- Deploy the produced package to `/opt/agrarian/server`.
+- Launch through `/opt/agrarian/server/AgrarianGameServer.sh`.
+- Manage the host with `agrarian-game-server.service`.
+
+Required evidence:
+
+- `systemctl is-active agrarian-game-server.service` reports `active`.
+- `ss -lunp` shows `AgrarianGame` listening on `0.0.0.0:7777/udp`.
+- The journal shows the Ground Zero map browse started.
+- The runbook explains the true dedicated target and fallback path.
+
+This gate is server-relevant and requires multiplayer server verification when
+server launch tooling or deployed package contents change.