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>

crates/sylpheed-cli/Cargo.toml

@@ -0,0 +1,21 @@
+[package]
+name = "sylpheed-cli"
+description = "Command-line asset tools for Project Sylpheed: Arc of Deception"
+version.workspace = true
+edition.workspace = true
+license.workspace = true
+authors.workspace = true
+
+[[bin]]
+name = "sylpheed-cli"
+path = "src/main.rs"
+
+[dependencies]
+sylpheed-formats      = { workspace = true }
+tokio                 = { workspace = true }
+anyhow                = { workspace = true }
+clap                  = { workspace = true }
+tracing               = { workspace = true }
+tracing-subscriber    = { workspace = true }
+colored               = "2"
+indicatif             = "0.17"