feat(exec): support command execution with exit code forwarding via CommandExecutor (#38)

Author: fohte

Cargo.lock

@@ -13,6 +13,7 @@ clap = { version = "=4.5.57", features = ["derive"] }
 serde = { version = "=1.0.228", features = ["derive"] }
 serde-saphyr = "=0.0.17"
 serde_json = "=1.0.149"
+shlex = "=1.3.0"
 thiserror = "=2.0.18"
 tree-sitter = "=0.25.10"
 tree-sitter-bash = "=0.25.1"