Phase 7: netfox + godot-jolt stack upgrade

Stack installed:
- netfox v1.35.3 (core + extras + noray + internals)
- godot-jolt v0.16.0-stable

Architecture:
- Server: ENet transport (works headless, no netfox deps)
- Client/Editor: netfox rollback (RollbackSynchronizer, TickInterpolator)

New/modified:
- docs/migration-netfox-plan.md — migration architecture
- scripts/network/network_manager.gd — netfox-aware ENet fallback
- scripts/network/player.gd — clean base player
- client/characters/player_netfox.gd — rollback player w/ WeaponManager
- client/characters/input/player_net_input.gd — BaseNetInput subclass
- client/characters/character/fps_character_controller.gd — netfox input feed
- client/weapons/ — weapon data, registry, TacticalWeaponHitscan, WeaponManager
- client/scripts/round_replicator.gd — client-side round state bridge
- server/scripts/round_manager.gd — improved state machine
- server/scripts/plugin_api/plugin_manager.gd — refined plugin system
- config: enemy_tag, ally_tag for meatball targeting

Removed: old C++ SimulationServer GDExtension (replaced by netfox rollback)

addons/netfox/properties/property-config.gd

@@ -0,0 +1,36 @@
+extends RefCounted
+class_name _PropertyConfig
+
+var _properties: Array[PropertyEntry] = []
+var _auth_properties: Dictionary = {} # Peer (int) to owned properties (Array[PropertyEntry])
+
+var local_peer_id: int
+
+func clear() -> void:
+	_properties.clear()
+	_auth_properties.clear()
+
+func set_properties(p_properties: Array[PropertyEntry]) -> void:
+	clear()
+	_properties.assign(p_properties)
+
+func set_properties_from_paths(property_paths: Array[String], property_cache: PropertyCache) -> void:
+	clear()
+	for path in property_paths:
+		_properties.append(property_cache.get_entry(path))
+
+func get_properties() -> Array[PropertyEntry]:
+	return _properties
+
+func get_owned_properties() -> Array[PropertyEntry]:
+	return get_properties_owned_by(local_peer_id)
+
+func get_properties_owned_by(peer: int) -> Array[PropertyEntry]:
+	if not _auth_properties.has(peer):
+		var owned_properties: Array[PropertyEntry] = []
+		for property_entry in _properties:
+			if property_entry.node.get_multiplayer_authority() == peer:
+				owned_properties.append(property_entry)
+		_auth_properties[peer] = owned_properties
+
+	return _auth_properties[peer]