hive-c0re, hive-priv: demote three routine, non-actionable log sites

hive-priv/src/main.rs

@@ -491,8 +491,14 @@ async fn exec(
 async fn start_container(name: &str) -> Result<(String, String)> {
     validate_agent_name(name)?;
     let machine = container_system_name(name);
+    // Silenced: a first-time create means the unit doesn't exist yet, and
+    // `systemctl`'s own "Unit ... not loaded" complaint for that case would
+    // otherwise land in the journal at error priority on every such start —
+    // routine, not a signal, since the result is already discarded below.
     let _ = Command::new("systemctl")
         .args(["reset-failed", &format!("container@{machine}.service")])
+        .stdout(std::process::Stdio::null())
+        .stderr(std::process::Stdio::null())
         .status()
         .await;
     container_run(&["start", &machine]).await