Two independent sources of noise in the web console, both from the
default plugin set:
1. 'Failed to deserialize meta for asset shaders/*.wgsl'
DefaultPlugins adds AssetPlugin with meta_check = Always, so bevy
fetches <path>.meta for every shader. The shaders ship raw (no .meta
files); on the trunk dev server those requests don't return a clean
404 that bevy maps to NotFound, so bevy receives bytes and tries to
RON-deserialize them as AssetMetaMinimal, logging a SpannedError per
shader. Set meta_check = Never: it skips the meta lookup and uses the
loader's default meta — correct for processor-free raw assets.
2. 'AudioContext was not allowed to start'
The default AudioPlugin opens a WebAudio sink at startup; browsers
block that until a user gesture and log it as a JS error. This app
has no audio, so disable AudioPlugin entirely — removes the noise and
shrinks the wasm binary.
Add planets as ray-traced spheres inside the RK4 geodesic loop. A new
planets.wgsl shader tests each integrator segment against a storage
buffer of SphereData (center/radius/color/emissive) and composites hits
front-to-back alongside the accretion disk. Lambert shading with a fixed
light direction; emissive flag bypasses shading.
- assets/shaders/planets.wgsl: segment-sphere intersection + shading
- src/scene/: Planet component, upload_planets system, default planet
- black_hole.wgsl: wire planet_hit into the compositing loop
- geodesic_schwarzschild.wgsl: replace tuple return with Deriv struct
