Initial commit: Transcience MVP

Top-down twin-stick bullet-hell, Godot 4.7, server-authoritative dedicated
server with client-side prediction. Clients send input only; the server
resolves every hit for both players and enemies (no PvP).

- SimWorld: whole simulation as plain RefCounted objects (no nodes, no
  physics server), ~0.24ms/tick at peak load -- runs headless for free and
  drives 78 tests in under a second
- BulletPool: struct-of-arrays bullet storage, replicated as spawn/despawn
  events rather than per-tick state
- Emitter framework (Ring/AimedSpread/WallGap/ArcSweep) shared by trash
  enemies and bosses -- a new boss is data in src/content/content.gd, no
  simulation changes
- The Warden of the Fold: stationary 4-phase boss built entirely on that
  format
- Lobby hub with a portal into on-demand dungeon instances; one process
  hosts the hub plus every concurrent dungeon
- Emergency escape: 3s server-owned channel, cancelled by damage
- tools/check.sh, test.sh (GUT), smoke.sh (real server + bot clients over
  ENet), bench.gd; git hooks wired to the same scripts
- docs/ARCHITECTURE.md, NETCODE.md, WORKFLOW.md, ROADMAP.md

addons/gut/gui/ResizeHandle.gd

@@ -0,0 +1,107 @@
+@tool
+extends ColorRect
+# #############################################################################
+# Resize Handle control.  Place onto a control.  Set the orientation, then
+# set the control that this should resize.  Then you can resize the control
+# by dragging this thing around.  It's pretty neat.
+# #############################################################################
+enum ORIENTATION {
+	LEFT,
+	RIGHT
+}
+
+@export var orientation := ORIENTATION.RIGHT :
+	get: return orientation
+	set(val):
+		orientation = val
+		queue_redraw()
+@export var resize_control : Control = null
+@export var vertical_resize := true
+
+var _line_width = .5
+var _line_color = Color(.4, .4, .4)
+var _active_line_color = Color(.3, .3, .3)
+var _invalid_line_color = Color(1, 0, 0)
+
+var _line_space = 3
+var _num_lines = 8
+
+var _mouse_down = false
+# Called when the node enters the scene tree for the first time.
+
+
+func _draw():
+	var c = _line_color
+	if(resize_control == null):
+		c = _invalid_line_color
+	elif(_mouse_down):
+		c = _active_line_color
+
+	if(orientation == ORIENTATION.LEFT):
+		_draw_resize_handle_left(c)
+	else:
+		_draw_resize_handle_right(c)
+
+
+func _gui_input(event):
+	if(resize_control == null):
+		return
+
+	if(orientation == ORIENTATION.LEFT):
+		_handle_left_input(event)
+	else:
+		_handle_right_input(event)
+
+
+# Draw the lines in the corner to show where you can
+# drag to resize the dialog
+func _draw_resize_handle_right(draw_color):
+	var br = size
+
+	for i in range(_num_lines):
+		var start = br - Vector2(i * _line_space, 0)
+		var end = br - Vector2(0, i * _line_space)
+		draw_line(start, end, draw_color, _line_width, true)
+
+
+func _draw_resize_handle_left(draw_color):
+	var bl = Vector2(0, size.y)
+
+	for i in range(_num_lines):
+		var start = bl + Vector2(i * _line_space, 0)
+		var end = bl -  Vector2(0, i * _line_space)
+		draw_line(start, end, draw_color, _line_width, true)
+
+
+func _handle_right_input(event : InputEvent):
+	if(event is InputEventMouseMotion):
+		if(_mouse_down and
+			event.global_position.x > 0 and
+			event.global_position.y < DisplayServer.window_get_size().y):
+
+			if(vertical_resize):
+				resize_control.size.y += event.relative.y
+			resize_control.size.x += event.relative.x
+	elif(event is InputEventMouseButton):
+		if(event.button_index == MOUSE_BUTTON_LEFT):
+			_mouse_down = event.pressed
+			queue_redraw()
+
+
+func _handle_left_input(event : InputEvent):
+	if(event is InputEventMouseMotion):
+		if(_mouse_down and
+			event.global_position.x > 0 and
+			event.global_position.y < DisplayServer.window_get_size().y):
+
+			var start_size = resize_control.size
+			resize_control.size.x -= event.relative.x
+			if(resize_control.size.x != start_size.x):
+				resize_control.global_position.x += event.relative.x
+
+			if(vertical_resize):
+				resize_control.size.y += event.relative.y
+	elif(event is InputEventMouseButton):
+		if(event.button_index == MOUSE_BUTTON_LEFT):
+			_mouse_down = event.pressed
+			queue_redraw()