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/game_version.gd

@@ -0,0 +1,33 @@
+class_name GameVersion
+extends RefCounted
+## Single source of truth for the game's version string.
+##
+## The numeric version lives in project.godot (application/config/version) so it
+## also feeds export metadata; here we read it back and layer on the pre-release
+## CHANNEL and a human-readable STAGE label. We're pre-1.0 — every 0.x build is
+## understood to be unstable, in-development software (see the recommendations in
+## the commit / PR notes for why 0.x is the convention for early game dev).
+
+## Pre-release channel appended to the number, SemVer-style (e.g. 0.1.0-alpha).
+const CHANNEL: String = "alpha"
+
+## Friendly stage banner shown to players so it's unmistakably an early build.
+const STAGE: String = "Early Development Build"
+
+
+## Bare numeric version, e.g. "0.1.0". Read from project settings.
+static func number() -> String:
+	return str(ProjectSettings.get_setting("application/config/version", "0.0.0"))
+
+
+## Full version tag, e.g. "v0.1.0-alpha".
+static func string() -> String:
+	var s := "v" + number()
+	if not CHANNEL.is_empty():
+		s += "-" + CHANNEL
+	return s
+
+
+## Version tag + stage banner, e.g. "v0.1.0-alpha · Early Development Build".
+static func full() -> String:
+	return "%s · %s" % [string(), STAGE]