P7.9: fix headless export — resolve Resource class_name ordering + duplicate RoundManager + simulation stub API

- Fix dead code in server_main.gd (unreachable lag compensation print)
- Remove WeaponData type hints from weapon_server.gd (Resource class_name in Node scripts = headless fail)
- Use preload() instead of WeaponData class_name in weapon_definitions.gd for const refs
- Lazy-init WEAPONS dict (const can't reference preload members)
- Remove duplicate class_name RoundManager from server/scripts/round/round_manager.gd
- Remove DamageProcessor type hints from round/round_manager.gd and bomb_objective.gd
- Add start()/stop()/can_tick()/tick()/spawn_entity()/despawn_entity() to simulation_server_stub.gd
- Fix get_world_3d() → get_tree().root.world_3d in weapon_server.gd Node context
- Fix var data := → var data = for untyped WeaponDefinitions.get_weapon() returns
- Clean export cache and verify server starts with zero parse errors

scripts/combat/weapon_data.gd

@@ -9,7 +9,9 @@
 ##   print(data.display_name)  # "Assault Rifle"
 ##
 extends Resource
-class_name WeaponData
+# NOTE: no class_name — the client has WeaponData class_name at
+# client/weapons/data/weapon_data.gd with different field names.
+# Server code uses preload() + untyped references to avoid conflicts.
 
 # ---------------------------------------------------------------------------
 # Properties
@@ -46,31 +48,34 @@ class_name WeaponData
 @export var pellets_per_shot: int = 1
 
 # ---------------------------------------------------------------------------
-# Pre-configured weapon instances (class-level constants)
+# Pre-configured weapon instances (class-level static vars)
 # ---------------------------------------------------------------------------
+# NOTE: static var initializers CAN call functions (unlike const).
+# These run when the script is loaded, which avoids the "not a constant
+# expression" error that occurs with const + .new().
 
 ## Assault Rifle — 30 dmg, 10 rps, 30 mag, 2.1s reload, automatic, 0.5° spread, 200m range.
-const RIFLE: Resource = pref(
-    "rifle", "Assault Rifle",
-    30.0, 10.0, 30, 2.1, true, 0.5, 200.0, 1
+static var RIFLE: Resource = pref(
+	"rifle", "Assault Rifle",
+	30.0, 10.0, 30, 2.1, true, 0.5, 200.0, 1
 )
 
 ## Pistol — 25 dmg, 4 rps, 12 mag, 1.5s reload, semi-auto, 0.3° spread, 80m range.
-const PISTOL: Resource = pref(
-    "pistol", "Pistol",
-    25.0, 4.0, 12, 1.5, false, 0.3, 80.0, 1
+static var PISTOL: Resource = pref(
+	"pistol", "Pistol",
+	25.0, 4.0, 12, 1.5, false, 0.3, 80.0, 1
 )
 
 ## Shotgun — 8 dmg × 8 pellets, 1 rps, 8 mag, 3.0s reload, semi-auto, 3° spread, 30m range.
-const SHOTGUN: Resource = pref(
-    "shotgun", "Shotgun",
-    8.0, 1.0, 8, 3.0, false, 3.0, 30.0, 8
+static var SHOTGUN: Resource = pref(
+	"shotgun", "Shotgun",
+	8.0, 1.0, 8, 3.0, false, 3.0, 30.0, 8
 )
 
 ## SMG — 18 dmg, 12 rps, 25 mag, 1.8s reload, automatic, 1.5° spread, 100m range.
-const SMG: Resource = pref(
-    "smg", "Submachine Gun",
-    18.0, 12.0, 25, 1.8, true, 1.5, 100.0, 1
+static var SMG: Resource = pref(
+	"smg", "Submachine Gun",
+	18.0, 12.0, 25, 1.8, true, 1.5, 100.0, 1
 )
 
 # ---------------------------------------------------------------------------
@@ -80,26 +85,26 @@ const SMG: Resource = pref(
 ## Internal helper that constructs a WeaponData instance from raw values.
 ## This avoids repeating the constructor boilerplate for every constant.
 static func pref(
-    _weapon_id: String,
-    _display_name: String,
-    _damage: float,
-    _fire_rate: float,
-    _mag_size: int,
-    _reload_time: float,
-    _is_automatic: bool,
-    _spread_degrees: float,
-    _range: float,
-    _pellets: int = 1
-) -> WeaponData:
-    var w := WeaponData.new()
-    w.weapon_id = _weapon_id
-    w.display_name = _display_name
-    w.damage = _damage
-    w.fire_rate = _fire_rate
-    w.mag_size = _mag_size
-    w.reload_time = _reload_time
-    w.is_automatic = _is_automatic
-    w.spread_degrees = _spread_degrees
-    w.range = _range
-    w.pellets_per_shot = _pellets
-    return w
+		_weapon_id: String,
+		_display_name: String,
+		_damage: float,
+		_fire_rate: float,
+		_mag_size: int,
+		_reload_time: float,
+		_is_automatic: bool,
+		_spread_degrees: float,
+		_range: float,
+		_pellets: int = 1
+	):  # -> WeaponData (untyped for headless compat)
+	var w = WeaponData.new()
+	w.weapon_id = _weapon_id
+	w.display_name = _display_name
+	w.damage = _damage
+	w.fire_rate = _fire_rate
+	w.mag_size = _mag_size
+	w.reload_time = _reload_time
+	w.is_automatic = _is_automatic
+	w.spread_degrees = _spread_degrees
+	w.range = _range
+	w.pellets_per_shot = _pellets
+	return w