Northern Resort presentation for the Fiala browser test

Original track: Northern Resort (snowmountain), Canis Lupus; converted by sj04736.
Sources: https://svn.code.sf.net/p/supertuxkart/code/stk-assets/tracks/snowmountain/
         https://svn.code.sf.net/p/supertuxkart/code/stk-assets/library/stklib_woodLodge_a/
         https://svn.code.sf.net/p/supertuxkart/code/stk-assets/textures/
Local authoring assets: /Users/zhou/SuperTuxKart/stk-media

The tree, wood lodge and aurora are converted from the original SPM geometry to GLB.
Snow, snow-covered conifer and lodge material images are original STK assets.
The six winter_sky images are unchanged, using original Irrlicht skybox face/UV mapping.
Winter sky: (c) 2010 Thomas Oppl, CC BY-SA 3.0.
Coniferous tree texture: Marianne Gagnon (Auria), CC BY-SA 3.0.
Other original author/license declarations: TRACK-LICENSE.txt, TRACK-DETAIL-LICENSE.txt,
ASSET-LICENSE.txt and ../STK-LICENSE.txt. Converted assets retain original licenses.
Adiumy and its tail-light mesh: ZAQraven, CC BY 3.0 (see ../CREDITS.txt).

Changes: GLB conversion, relocation/rescaling of decorations to fit the existing
50 x 50 m square. Lodge is visual scenery at the fixed centre pole; it does not
add a building-sized collider. Trees visualize the existing pole colliders;
queued trees are translucent and have no collision before activation.
No changes to sim.js, actor weights, rewards or observation/action definitions.

Adiumy kart.xml headlight source parameters:
position (-0.001737, 0.287080, 0.506312), rotation (0,0,0), radius 5,
energy 1.5, inner-cone 0.524, outer-cone 0.785.
STK X/Y/Z = right/up/forward; GLTF Z is negated. Lamp is parented to the
same orientation, uniform scale and ground offset as the kart. Range scales
with kart size. Three.js spotlight falloff/energy and tone mapping differ
from STK, so brightness is not a pixel-identical renderer reproduction.
Track moon/ambient colour values are taken from scene.xml, with web exposure
and intensity adaptation. Linear fog approximates STK's capped fog.
Aurora uses the original additive material and UV speeds (0.2, -0.1).

Smoke: original STK smoke texture, emitted at Adiumy's actual rear wheel pivots.
Lifetime, size, emission rate and motion remain the custom browser particle
implementation, not a full port of STK smoke.xml. See ../fx/CREDITS.txt.

Scene refinements (2026-09-07):
Current-task marker: original stklib_blueNeonArrow_a mesh, reoriented downward,
rescaled and tinted cyan. Original library by Jean-Manuel Clemencon.
Street lamp: original stklib_woodPostLamp_a (also referenced by Northern Resort),
rescaled and placed in front of the lodge; added visible bulb and warm point light.
Sources: https://svn.code.sf.net/p/supertuxkart/code/stk-assets/library/stklib_blueNeonArrow_a/
         https://svn.code.sf.net/p/supertuxkart/code/stk-assets/library/stklib_woodPostLamp_a/

Terrain: deterministic visual-only smooth height field, independent seed 20260907.
Current controls: amplitude 0–3 m (default 1.2), density 0.25–3 (default 1).
Centre and shoreline flatten smoothly. Settings persist independently of simulation.
Car height/pitch/roll, trees, smoke and trail follow the visual terrain; simulation
coordinates, collisions, tire forces, model inputs and actions stay unchanged.
Queued trees use original colors and opaque materials, uniformly scaled to 1/5 on each axis. Only the current task has an overhead marker.

2026-09-07 landscape revision: original neon-arrow mesh anchored at its downward tip; streetlamp scaled to 2/3 of lodge height and placed left of the +X door facade. Procedural rounded shoreline, snow lip and asymmetric floating rock replace square visual edging. Two procedural tire-tread strips follow recorded rear-wheel poses; task rays follow the algorithm overlay switch. These geometries are newly authored visual effects.

Local Mac revision: persistent tree instances grow with a damped bounce when promoted from queue to an active input slot; a bounded procedural snow-particle burst falls from the branches. Ground rings follow the 2D overlay. Original tree geometry and textures unchanged.