Phase 1: Repository & Infrastructure Setup

- Renamed directories: codex-rs -> llmx-rs, codex-cli -> llmx-cli
- Updated package.json files:
  - Root: llmx-monorepo
  - CLI: @llmx/llmx
  - SDK: @llmx/llmx-sdk
- Updated pnpm workspace configuration
- Renamed binary: codex.js -> llmx.js
- Updated environment variables: CODEX_* -> LLMX_*
- Changed repository URLs to valknar/llmx

🤖 Generated with Claude Code

llmx-rs/cli/src/exit_status.rs

@@ -0,0 +1,23 @@
+#[cfg(unix)]
+pub(crate) fn handle_exit_status(status: std::process::ExitStatus) -> ! {
+    use std::os::unix::process::ExitStatusExt;
+
+    // Use ExitStatus to derive the exit code.
+    if let Some(code) = status.code() {
+        std::process::exit(code);
+    } else if let Some(signal) = status.signal() {
+        std::process::exit(128 + signal);
+    } else {
+        std::process::exit(1);
+    }
+}
+
+#[cfg(windows)]
+pub(crate) fn handle_exit_status(status: std::process::ExitStatus) -> ! {
+    if let Some(code) = status.code() {
+        std::process::exit(code);
+    } else {
+        // Rare on Windows, but if it happens: use fallback code.
+        std::process::exit(1);
+    }
+}