feat: initial implementation of Depot package manager

- Implement source-based package management with support for archives and Git
- Add multi-system build support (Autotools, CMake, Meson, Rust/Cargo, Custom)
- Implement atomic installation logic using transactions and fakeroot
- Add dependency resolution for build-time and runtime requirements
- Implement package indexing and local repository management
- Add comprehensive configuration system with system/package overrides
- Include Project guidelines (AGENTS.md) and README.md

src/fakeroot.rs

@@ -0,0 +1,26 @@
+//! Fakeroot support for running commands as pseudo-root
+//! Uses the system fakeroot command when not running as root
+
+use std::path::Path;
+use std::process::Command;
+
+/// Check if we're running as root
+pub fn is_root() -> bool {
+    nix::unistd::geteuid().is_root()
+}
+
+/// Wrap a command for fakeroot execution
+/// For make install, we use the system fakeroot command
+pub fn wrap_install_command(program: &str, destdir: &Path) -> Command {
+    if is_root() {
+        Command::new(program)
+    } else {
+        // Use system fakeroot command which handles LD_PRELOAD internally
+        let mut cmd = Command::new("fakeroot");
+        cmd.arg("--");
+        cmd.arg(program);
+        // Fakeroot will ensure file ownership appears as root
+        cmd.env("DESTDIR", destdir);
+        cmd
+    }
+}