feat: initialise workspace — Milestone 1 asset explorer
Three-crate Cargo workspace structured per PROJECT.md spec:
- crates/sylpheed-formats — Xbox 360 format parsers (no Bevy)
- crates/sylpheed-viewer — Bevy 0.15 asset viewer + egui UI
- crates/sylpheed-cli — CLI tools (extract/list/sniff/texture)
Milestone 1 features:
- XISO disc image reading via xdvdfs 0.8
- XPR2 texture container parsing + Morton de-tiling
- D3DFORMAT → wgpu TextureFormat mapping (DXT1/3/5, DXN, ARGB)
- Custom Bevy AssetLoader for .xpr files
- Orbit camera (LMB orbit, RMB pan, scroll zoom)
- egui file browser + RE notes panel
- CLI: extract / list / sniff / texture info / texture export
- GitHub Actions CI (Linux, macOS, Windows, WASM)
- Trunk WASM build config
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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