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/thing_counter.gd

@@ -0,0 +1,55 @@
+var things = {}
+
+func get_unique_count():
+	return things.size()
+
+
+func add_thing_to_count(thing):
+	if(!things.has(thing)):
+		things[thing] = 0
+
+
+func add(thing):
+	if(things.has(thing)):
+		things[thing] += 1
+	else:
+		things[thing] = 1
+
+
+func has(thing):
+	return things.has(thing)
+
+
+func count(thing):
+	var to_return = 0
+	if(things.has(thing)):
+		to_return = things[thing]
+	return to_return
+
+
+func sum():
+	var to_return = 0
+	for key in things:
+		to_return += things[key]
+	return to_return
+
+
+func to_s():
+	var to_return = ""
+	for key in things:
+		to_return += str(key, ":  ", things[key], "\n")
+	to_return += str("sum: ", sum())
+	return to_return
+
+
+func get_max_count():
+	var max_val = null
+	for key in things:
+		if(max_val == null or things[key] > max_val):
+			max_val = things[key]
+	return max_val
+
+
+func add_array_items(array):
+	for i in range(array.size()):
+		add(array[i])