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

src/core/game_log.gd

@@ -0,0 +1,37 @@
+class_name GameLog
+extends RefCounted
+## Tagged logging that survives headless runs.
+##
+## Static rather than an autoload so it works from unit tests and from
+## `--script` tool runs, where autoload identifiers are not registered at all.
+## The dedicated server has no console UI, so every line carries the role that
+## produced it -- that is what makes a captured server log readable later.
+
+enum Level { DEBUG, INFO, WARN, ERROR }
+
+## Raise to WARN on a busy server; DEBUG is very chatty at 60 Hz.
+static var min_level: Level = Level.INFO
+static var role_tag: String = "?"
+
+
+static func _fmt(level: Level, tag: String, msg: String) -> String:
+	return "[%s][%s][%s] %s" % [Level.keys()[level], role_tag, tag, msg]
+
+
+static func debug(tag: String, msg: String) -> void:
+	if min_level <= Level.DEBUG:
+		print(_fmt(Level.DEBUG, tag, msg))
+
+
+static func info(tag: String, msg: String) -> void:
+	if min_level <= Level.INFO:
+		print(_fmt(Level.INFO, tag, msg))
+
+
+static func warn(tag: String, msg: String) -> void:
+	if min_level <= Level.WARN:
+		print(_fmt(Level.WARN, tag, msg))
+
+
+static func error(tag: String, msg: String) -> void:
+	printerr(_fmt(Level.ERROR, tag, msg))