dashboard: stop/restart per-container + update-all when any stale

hive-c0re/src/lifecycle.rs

@@ -126,6 +126,32 @@ pub async fn kill(name: &str) -> Result<()> {
     run(&["stop", &container]).await
 }
 
+pub async fn start(name: &str) -> Result<()> {
+    validate(name)?;
+    let container = container_name(name);
+    run(&["start", &container]).await
+}
+
+/// Stop + start without regenerating any config. For "kick the container"
+/// without touching the flake or nspawn flags.
+pub async fn restart(name: &str) -> Result<()> {
+    kill(name).await?;
+    start(name).await
+}
+
+/// True when the container's systemd unit is active. Used by the dashboard
+/// to gate stop/restart buttons.
+pub async fn is_running(name: &str) -> bool {
+    let container = container_name(name);
+    let unit = format!("container@{container}.service");
+    Command::new("systemctl")
+        .args(["is-active", "--quiet", &unit])
+        .status()
+        .await
+        .map(|s| s.success())
+        .unwrap_or(false)
+}
+
 /// Fully tear down a sub-agent's container: stop + remove via `nixos-container
 /// destroy`, then clean our own systemd drop-in. Leaves it to the caller to
 /// wipe `/var/lib/hyperhive/...` state and the per-agent runtime dir.