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-kernel/src/objects.rs

@@ -0,0 +1,12 @@
+//! Kernel object tracking for HLE.
+
+/// Kernel object types tracked by handle.
+#[derive(Debug)]
+pub enum KernelObject {
+    Event { manual_reset: bool, signaled: bool },
+    Semaphore { count: i32, max: i32 },
+    File { path: String },
+    Thread { id: u32 },
+    Timer,
+    Mutex,
+}