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/ShortcutDialog.gd

@@ -0,0 +1,120 @@
+@tool
+extends ConfirmationDialog
+
+var GutEditorGlobals = load('res://addons/gut/gui/editor_globals.gd')
+var default_path = GutEditorGlobals.editor_shortcuts_path
+
+
+@onready var scbtn_run_all = $Scroll/Layout/CRunAll/ShortcutButton
+@onready var scbtn_run_current_script = $Scroll/Layout/CRunCurrentScript/ShortcutButton
+@onready var scbtn_run_current_inner = $Scroll/Layout/CRunCurrentInner/ShortcutButton
+@onready var scbtn_run_current_test = $Scroll/Layout/CRunCurrentTest/ShortcutButton
+@onready var scbtn_run_at_cursor = $Scroll/Layout/CRunAtCursor/ShortcutButton
+@onready var scbtn_rerun = $Scroll/Layout/CRerun/ShortcutButton
+@onready var scbtn_panel = $Scroll/Layout/CPanelButton/ShortcutButton
+@onready var scbtn_windowed = $Scroll/Layout/CToggleWindowed/ShortcutButton
+
+
+@onready var all_buttons = [
+	scbtn_run_all, scbtn_run_current_script, scbtn_run_current_inner,
+	scbtn_run_current_test, scbtn_run_at_cursor, scbtn_rerun,
+	scbtn_panel, scbtn_windowed
+]
+
+
+func _debug_ready():
+	popup_centered()
+
+	var btn = Button.new()
+	btn.text = "show"
+	get_tree().root.add_child(btn)
+	btn.pressed.connect(popup)
+	btn.position = Vector2(100, 100)
+	btn.size = Vector2(100, 100)
+
+	size_changed.connect(func(): title = str(size))
+
+
+func _ready():
+	for scbtn in all_buttons:
+		scbtn.connect('start_edit', _on_edit_start.bind(scbtn))
+		scbtn.connect('end_edit', _on_edit_end)
+
+	canceled.connect(_on_cancel)
+
+	# Sizing this window on different monitors, especially compared to what it
+	# looks like if you just run this project is annoying.  This is what I came
+	# up with after getting annoyed.  You probably won't be looking at this
+	# very often so it's fine...until it isn't.
+	size = Vector2(DisplayServer.screen_get_size()) * Vector2(.5, .8)
+
+	if(get_parent() == get_tree().root):
+		_debug_ready.call_deferred()
+
+
+
+func _cancel_all():
+	for scbtn in all_buttons:
+		scbtn.cancel()
+
+
+# ------------
+# Events
+# ------------
+func _on_cancel():
+	_cancel_all()
+	load_shortcuts()
+
+
+func _on_edit_start(which):
+	for scbtn in all_buttons:
+		if(scbtn != which):
+			scbtn.disable_set(true)
+			scbtn.disable_clear(true)
+
+
+func _on_edit_end():
+	for scbtn in all_buttons:
+		scbtn.disable_set(false)
+		scbtn.disable_clear(false)
+
+
+# ------------
+# Public
+# ------------
+func save_shortcuts():
+	save_shortcuts_to_file(default_path)
+
+
+func save_shortcuts_to_file(path):
+	var f = ConfigFile.new()
+	f.set_value('main', 'panel_button', scbtn_panel.get_shortcut())
+	f.set_value('main', 'rerun', scbtn_rerun.get_shortcut())
+	f.set_value('main', 'run_all', scbtn_run_all.get_shortcut())
+	f.set_value('main', 'run_at_cursor', scbtn_run_at_cursor.get_shortcut())
+	f.set_value('main', 'run_current_inner', scbtn_run_current_inner.get_shortcut())
+	f.set_value('main', 'run_current_script', scbtn_run_current_script.get_shortcut())
+	f.set_value('main', 'run_current_test', scbtn_run_current_test.get_shortcut())
+	# f.set_value('main', 'toggle_windowed', scbtn_windowed.get_shortcut())
+	f.save(path)
+
+
+func load_shortcuts():
+	load_shortcuts_from_file(default_path)
+
+
+func load_shortcuts_from_file(path):
+	var f = ConfigFile.new()
+	# as long as this shortcut is never modified, this is fine, otherwise
+	# each thing should get its own default instead.
+	var empty = Shortcut.new()
+
+	f.load(path)
+	scbtn_panel.set_shortcut(f.get_value('main', 'panel_button', empty))
+	scbtn_rerun.set_shortcut(f.get_value('main', 'rerun', empty))
+	scbtn_run_all.set_shortcut(f.get_value('main', 'run_all', empty))
+	scbtn_run_at_cursor.set_shortcut(f.get_value('main', 'run_at_cursor', empty))
+	scbtn_run_current_inner.set_shortcut(f.get_value('main', 'run_current_inner', empty))
+	scbtn_run_current_script.set_shortcut(f.get_value('main', 'run_current_script', empty))
+	scbtn_run_current_test.set_shortcut(f.get_value('main', 'run_current_test', empty))
+	# scbtn_windowed.set_shortcut(f.get_value('main', 'toggle_windowed', empty))