Reorganize into role-based folders and consolidate art

Move every script and scene into role-based directories (actors/, systems/, ui/,
levels/, props/) and all raw art under art/ (grouped by role, snake_case,
Extract-Textures GLBs), dropping Blender version-suffix noise. Filenames are
snake_case (PascalCase reserved for class_name) to avoid case-insensitive
filesystem aliasing on the web/macOS targets. Routes the bull's hits through the
typed DamageEvent pipeline and wires the bull's abilities to the Fx library.
Updates CLAUDE.md's folder-layout overview to match.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CCyaJPTHCH9EDthpf4A5Sj

ui/ui_fonts.gd

@@ -0,0 +1,49 @@
+class_name UiFonts
+extends RefCounted
+## Shared thematic fonts for menus and HUD. Cinzel is a Roman monumental capital
+## typeface — a deliberate nod to the "-osseum" (Colosseum) in Bullosseum.
+##
+## Fonts load via load_dynamic_font so they resolve identically in the editor,
+## headless tests and exported builds, whether or not the .ttf has been imported.
+
+const _DECORATIVE := "res://art/fonts/CinzelDecorative-Bold.ttf"
+const _ROMAN      := "res://art/fonts/Cinzel.ttf"
+
+static var _title: FontFile = null
+static var _body: FontFile = null
+static var _body_bold: FontVariation = null
+
+
+## Ornate display face — big banners, menu title, win/lose text.
+static func title() -> FontFile:
+	if _title == null:
+		_title = _load(_DECORATIVE)
+	return _title
+
+
+## Cleaner monumental face — buttons, labels, body copy.
+static func body() -> FontFile:
+	if _body == null:
+		_body = _load(_ROMAN)
+	return _body
+
+
+## Emboldened Roman face for small, high-legibility bits (keycaps, badges) where
+## Cinzel's thin regular strokes wash out. Faked via FontVariation since only the
+## regular weight ships, so no extra .ttf is needed.
+static func body_bold() -> FontVariation:
+	if _body_bold == null:
+		_body_bold = FontVariation.new()
+		_body_bold.base_font = body()
+		_body_bold.variation_embolden = 0.5
+	return _body_bold
+
+
+static func _load(path: String) -> FontFile:
+	if ResourceLoader.exists(path):
+		var res := load(path)
+		if res is FontFile:
+			return res as FontFile
+	var f := FontFile.new()
+	f.load_dynamic_font(path)
+	return f