fix(multiplayer): gate allocated matches on full roster

Game/scripts/server_boot.gd

@@ -83,6 +83,10 @@ func _ready() -> void:
 			get_tree().quit(1)
 			return
 		_control = ServerControlScript.new()
+		# An allocated process owns exactly the roster issued for this match.
+		# Never let the general-purpose direct-server default (one player) start
+		# an allocated match with only a partial assignment admitted.
+		config.values["min-players"] = required_min_players(true, roster_tokens.size(), int(config.get_value("min-players")))
 		_control.name = "ServerControl"
 		_control.drain_requested.connect(_on_drain_requested)
 		get_tree().root.add_child.call_deferred(_control)
@@ -180,3 +184,9 @@ func _on_drain_requested() -> void:
 	_drain_requested = true
 	MatchNet.admissions_open = false
 	ServerLog.info("server_draining", {"reason": "control_request"})
+
+
+static func required_min_players(allocated: bool, roster_size: int, configured: int) -> int:
+	if allocated and roster_size > 0:
+		return roster_size
+	return configured

Game/tests/cases/test_server_config.gd

@@ -157,3 +157,10 @@ func test_allocated_mode_rejects_missing_or_expired_assignment_manifest_fields()
 	assert_true(not missing.is_valid(), "client build and expiry are required")
 	var expired = _parse(["--allocated-mode", "--match-id=m", "--server-id=s", "--playlist-version=v", "--client-build=client", "--assignment-expiry-unix=1", "--server-image-digest=sha256:" + "a".repeat(64), "--transport=enet", "--region=EU"])
 	assert_true(not expired.is_valid(), "expired assignment is rejected")
+
+
+func test_allocated_start_floor_is_the_verified_roster_size() -> void:
+	var boot = preload("res://scripts/server_boot.gd")
+	assert_eq(boot.required_min_players(true, 6, 1), 6, "allocated six-player roster cannot start with one player")
+	assert_eq(boot.required_min_players(true, 2, 6), 2, "allocated casual roster uses its complete size")
+	assert_eq(boot.required_min_players(false, 1, 1), 1, "direct server keeps its configured floor")

multiplayer-next.md

@@ -1396,3 +1396,5 @@ Bounded, but not by much: the attacker must race a genuine disconnect, and they
 The current working implementation now wires `deploy/k8s/base/fleet.yaml` to the digest-pinned `game-server` supervisor target, the in-cluster control-plane Service, workload roster materialization, signing/drain secret references, downward-API server/image identity, and the required game-server egress policy. `kubectl kustomize deploy/k8s/base` and `server/security/test_fleet_manifests.py` pass. The older 8.28 narrative above still records the pre-wiring state; live Agones, operator secret/image replacement, and real cluster readiness remain explicit gates.
 
 The NA overlay now also patches the allocated child’s `--region=NA` argument, keeping it aligned with the NA Fleet label; rendered EU and NA overlays and the adversarial manifest test verify that regional assignment validation cannot silently remain EU in the NA deployment.
+
+Allocated Godot startup now derives its `min-players` floor from the verified signed roster size, preventing the direct-server default of one player from starting a partially admitted allocated match. A focused regression test covers six-player, casual two-player, and direct-server behavior; the full Godot harness is currently unavailable because Godot cannot open its shared `user://` log and crashes in the macOS renderer before test execution.