Стартовый хаб с порталами, песочница отдельным пакетом, присед

- World/Hub: маленькая стартовая комната (код, без ассетов) с порталами на карты;
  новые карты добавляются записью в PORTALS (влезает 6 порталов).
- Песочница (main.tscn) вынесена в world.pck и качается при входе в портал;
  основной пакет игры вместо 19.7 МБ стал 2.1 МБ. Выходы из карт ведут в хаб.
- Экспорт: три пресета (Web — движок и хаб, World, Backrooms).
- Присед: удерживать C (на бегу Shift+C по-прежнему подкат), скорость 3.5.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

export_presets.cfg

@@ -10,7 +10,7 @@ dedicated_server=false
 custom_features=""
 export_filter="all_resources"
 include_filter=""
-exclude_filter="models/backrooms/*, World/Backrooms/*"
+exclude_filter="models/backrooms/*, World/Backrooms/*, main.tscn, World/Floor/*, World/Sky/*, World/tron_01.ogg, World/forest.gd, World/birds.gd, World/levitate.gd, World/nav-bake.gd, models/building_02*, models/tower_01/*, models/house_02/*, models/cyber-office/*, models/obelisk_01/*, models/Tree_01/*, models/empire-state/*"
 export_path="../grid-world/index.html"
 patches=PackedStringArray()
 patch_delta_encoding=false
@@ -100,3 +100,53 @@ progressive_web_app/icon_512x512=""
 progressive_web_app/background_color=Color(0, 0, 0, 1)
 threads/emscripten_pool_size=8
 threads/godot_pool_size=4
+
+[preset.2]
+
+name="World"
+platform="Web"
+dedicated_server=false
+custom_features=""
+export_filter="resources"
+export_files=PackedStringArray("res://main.tscn")
+include_filter=""
+exclude_filter="Player/*, models/Bochi-Rock/*, World/portal.gd"
+export_path="../grid-world/world.pck"
+patches=PackedStringArray()
+patch_delta_encoding=false
+patch_delta_compression_level_zstd=19
+patch_delta_min_reduction=0.1
+patch_delta_include_filters="*"
+patch_delta_exclude_filters=""
+encryption_include_filters=""
+encryption_exclude_filters=""
+seed=0
+encrypt_pck=false
+encrypt_directory=false
+script_export_mode=2
+
+[preset.2.options]
+
+custom_template/debug=""
+custom_template/release=""
+variant/extensions_support=true
+variant/thread_support=false
+vram_texture_compression/for_desktop=true
+vram_texture_compression/for_mobile=false
+html/export_icon=true
+html/custom_html_shell=""
+html/head_include=""
+html/canvas_resize_policy=2
+html/focus_canvas_on_start=true
+html/experimental_virtual_keyboard=false
+progressive_web_app/enabled=false
+progressive_web_app/ensure_cross_origin_isolation_headers=true
+progressive_web_app/offline_page=""
+progressive_web_app/display=3
+progressive_web_app/orientation=0
+progressive_web_app/icon_144x144=""
+progressive_web_app/icon_180x180=""
+progressive_web_app/icon_512x512=""
+progressive_web_app/background_color=Color(0, 0, 0, 1)
+threads/emscripten_pool_size=8
+threads/godot_pool_size=4