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

art/levels/lobby_rock.png.import

@@ -0,0 +1,45 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://cbm5a523ff5ug"
+path.s3tc="res://.godot/imported/lobby_rock.png-66f142adb44f06651f707bc164b6c921.s3tc.ctex"
+path.etc2="res://.godot/imported/lobby_rock.png-66f142adb44f06651f707bc164b6c921.etc2.ctex"
+metadata={
+"imported_formats": ["s3tc_bptc", "etc2_astc"],
+"vram_texture": true
+}
+generator_parameters={
+"md5": "de3796fe2c1123ae5ba27a0532fda6bd"
+}
+
+[deps]
+
+source_file="res://art/levels/lobby_rock.png"
+dest_files=["res://.godot/imported/lobby_rock.png-66f142adb44f06651f707bc164b6c921.s3tc.ctex", "res://.godot/imported/lobby_rock.png-66f142adb44f06651f707bc164b6c921.etc2.ctex"]
+
+[params]
+
+compress/mode=2
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/uastc_level=0
+compress/rdo_quality_loss=0.0
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=true
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/channel_remap/red=0
+process/channel_remap/green=1
+process/channel_remap/blue=2
+process/channel_remap/alpha=3
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=0