add get_logs tool to manager mcp surface

hive-c0re/src/manager_server.rs

@@ -273,6 +273,35 @@ async fn dispatch(req: &ManagerRequest, coord: &Arc<Coordinator>) -> ManagerResp
                 },
             }
         }
+        ManagerRequest::GetLogs { agent, lines } => {
+            let n = lines.unwrap_or(50);
+            tracing::info!(%agent, %n, "manager: get_logs");
+            match tokio::process::Command::new("journalctl")
+                .args([
+                    "-M",
+                    agent,
+                    "-n",
+                    &n.to_string(),
+                    "--no-pager",
+                    "--output=short",
+                ])
+                .output()
+                .await
+            {
+                Ok(out) => {
+                    let content = if out.status.success() || !out.stdout.is_empty() {
+                        String::from_utf8_lossy(&out.stdout).into_owned()
+                    } else {
+                        let stderr = String::from_utf8_lossy(&out.stderr);
+                        format!("journalctl exited {}: {stderr}", out.status)
+                    };
+                    ManagerResponse::Logs { content }
+                }
+                Err(e) => ManagerResponse::Err {
+                    message: format!("journalctl spawn failed: {e:#}"),
+                },
+            }
+        }
         ManagerRequest::RequestApplyCommit {
             agent,
             commit_ref,