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)

client/method_dump.gd

@@ -0,0 +1,33 @@
+@tool
+extends Node
+
+func _ready():
+	print("=== LightmapGI Method Discovery ===")
+	
+	# Create a mock LightmapGI to check methods
+	# Actually, let's check the class reference
+	var methods = ClassDB.class_get_method_list("LightmapGI")
+	print("LightmapGI methods:")
+	for m in methods:
+		print("  ", m)
+	
+	print("")
+	print("ClassDB method list end.")
+	
+	# Also try to actually load and check
+	var scene = load("res://assets/scenes/modular/kit_demo.tscn")
+	if scene:
+		var inst = scene.instantiate()
+		get_tree().root.add_child(inst)
+		var lgi = null
+		for c in inst.get_children():
+			if c is LightmapGI:
+				lgi = c
+				break
+		if lgi:
+			print("")
+			print("Runtime LightmapGI methods:")
+			for m in lgi.get_method_list():
+				print("  ", m.get("name", m) if m is Dictionary else m)
+	
+	get_tree().quit(0)