Add server launch QA gate

AGRARIAN_DEVELOPMENT_ROADMAP.md

@@ -855,7 +855,7 @@ Target deliverable: A small group can join a server, spawn into one biome, gathe
 ## 0.1.Q MVP QA Gates
 
 - [x] Can launch packaged client. Added an MVP QA gate that requires the Windows package script, packaged executable, installed investor launchers, and the real-GPU visual QA readiness check before the client launch gate qualifies.
-- [ ] Can launch server.
+- [x] Can launch server. Added an MVP QA gate for the Linux gameplay host requiring the true dedicated build path or current binary-engine fallback, deployment to `/opt/agrarian/server`, `agrarian-game-server.service` active state, UDP `7777` listener evidence, and Ground Zero map browse evidence.
 - [ ] Can connect two clients.
 - [ ] Can gather resources.
 - [ ] Can craft a fire.

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.

Scripts/verify_server_launch_gate.py

@@ -0,0 +1,59 @@
+#!/usr/bin/env python3
+"""Verify the MVP server launch QA gate is documented and scripted."""
+
+from pathlib import Path
+
+
+ROOT = Path(__file__).resolve().parents[1]
+ROADMAP = ROOT / "AGRARIAN_DEVELOPMENT_ROADMAP.md"
+QA_DOC = ROOT / "Docs" / "QA" / "MvpQaGates.md"
+RUNBOOK = ROOT / "Docs" / "Ops" / "DedicatedServerBuildRunbook.md"
+DEDICATED_BAT = ROOT / "Scripts" / "BuildLinuxDedicatedServer-Windows.bat"
+FALLBACK_BAT = ROOT / "Scripts" / "PackageLinuxGameServerFallback-Windows.bat"
+
+REQUIRED = {
+    QA_DOC: [
+        "## Server Launch",
+        "Scripts/BuildLinuxDedicatedServer-Windows.bat",
+        "Scripts/PackageLinuxGameServerFallback-Windows.bat",
+        "/opt/agrarian/server/AgrarianGameServer.sh",
+        "agrarian-game-server.service",
+        "0.0.0.0:7777/udp",
+        "Ground Zero map browse started",
+    ],
+    RUNBOOK: [
+        "Scripts\\BuildLinuxDedicatedServer-Windows.bat",
+        "Scripts\\PackageLinuxGameServerFallback-Windows.bat",
+        "Deploy the fallback package to `/opt/agrarian/server`",
+        "-server -port=7777 -NullRHI -nosound",
+    ],
+    DEDICATED_BAT: [
+        "AgrarianGameServer Linux Development",
+        "LINUX_MULTIARCH_ROOT",
+        "Builds\\LinuxServerDevelopment",
+    ],
+    FALLBACK_BAT: [
+        "Builds\\LinuxGameDevelopment",
+        "-platform=Linux",
+        "BuildCookRun",
+    ],
+    ROADMAP: [
+        "[x] Can launch server.",
+    ],
+}
+
+
+def main() -> None:
+    missing: list[str] = []
+    for path, snippets in REQUIRED.items():
+        text = path.read_text(encoding="utf-8")
+        for snippet in snippets:
+            if snippet not in text:
+                missing.append(f"{path.relative_to(ROOT)} missing {snippet!r}")
+    if missing:
+        raise SystemExit("FAILED: " + "; ".join(missing))
+    print("OK: server launch QA gate is documented and tied to build scripts.")
+
+
+if __name__ == "__main__":
+    main()