Clarify sandbox causal edge descriptors

crates/lazaret-linux/src/process.rs

@@ -60,6 +60,12 @@ impl TargetCommand {
         self
     }
 
+    #[must_use]
+    pub fn with_parent_death_kill_edge(mut self) -> Self {
+        self.parent_action = ParentAction::Kill;
+        self
+    }
+
     #[allow(clippy::disallowed_types)]
     fn append_to(&self, command: &mut std::process::Command) {
         command