Initial commit: xenia-rs workspace for Xbox 360 RE

Rust reimplementation of the xenia Xbox 360 emulator targeting reverse-
engineering and preservation, initially scoped to Project Sylpheed.

Includes:
- XEX2 loader (LZX decompression, AES decryption, PE parsing)
- XISO / XGD2 disc image VFS
- PPC interpreter with 200+ opcodes and VMX128 decoding
- Static analyzer: functions, cross-references, labels, asm + SQLite output
- HLE kernel covering the xboxkrnl/xam subset used by Sylpheed init
- Debugger with in-memory and SQLite-backed execution tracing
- `xenia-rs` CLI with extract/dis/exec commands that produce cumulative,
  superset SQLite databases and opt-in instruction/import/branch traces

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

crates/xenia-app/Cargo.toml

@@ -0,0 +1,28 @@
+[package]
+name = "xenia-app"
+version.workspace = true
+edition.workspace = true
+license.workspace = true
+
+[[bin]]
+name = "xenia-rs"
+path = "src/main.rs"
+
+[dependencies]
+xenia-types = { workspace = true }
+xenia-memory = { workspace = true }
+xenia-cpu = { workspace = true }
+xenia-xex = { workspace = true }
+xenia-vfs = { workspace = true }
+xenia-kernel = { workspace = true }
+xenia-gpu = { workspace = true }
+xenia-apu = { workspace = true }
+xenia-hid = { workspace = true }
+xenia-debugger = { workspace = true }
+xenia-analysis = { workspace = true }
+tracing = { workspace = true }
+tracing-subscriber = { workspace = true }
+anyhow = { workspace = true }
+clap = { version = "4", features = ["derive"] }
+serde = { workspace = true }
+serde_json = { workspace = true }