feat(#1107): hivectl agents restart / restart-all commands

hive-c0re/src/server.rs

@@ -140,6 +140,32 @@ async fn dispatch(req: &HostRequest, coord: Arc<Coordinator>) -> HostResponse {
                 });
                 HostResponse::success()
             }
+            HostRequest::Restart { name } => {
+                tracing::info!(%name, "restart");
+                lifecycle::restart(name).await?;
+                HostResponse::success()
+            }
+            HostRequest::RestartAll => {
+                tracing::info!("restart-all");
+                let agents = lifecycle::list().await?;
+                let mut errors: Vec<String> = Vec::new();
+                for agent in &agents {
+                    if let Err(e) = lifecycle::restart(agent).await {
+                        tracing::warn!(%agent, error = ?e, "restart-all: failed to restart agent");
+                        errors.push(format!("{agent}: {e:#}"));
+                    }
+                }
+                if errors.is_empty() {
+                    HostResponse::list(agents)
+                } else {
+                    HostResponse {
+                        ok: false,
+                        error: Some(errors.join("; ")),
+                        agents: Some(agents),
+                        approvals: None,
+                    }
+                }
+            }
             HostRequest::Destroy { name, purge } => {
                 actions::destroy(&coord, name, *purge).await?;
                 HostResponse::success()