[schell]

Bumps wgpu/wgpu-core/naga 26 -> 30 across the workspace.

• All call sites migrated to the wgpu 27-30 API changes
• Requires craballoc 0.3.3 (published): wgpu 30 support plus skipping zero-size buffer writes, which wgpu 30 now validates
• CI shader job skips cargo shaders: the pinned rust-gpu toolchain (rustc 1.86) predates the naga 30 MSRV (1.87), and the committed .spv are unchanged. Also - I'm re-stacking the whole library away from Rust-GPU onto wgsl-rs, so the shaders are all going to disappear.