add get_logs tool to manager mcp surface

hive-sh4re/src/lib.rs

@@ -475,6 +475,17 @@ pub enum ManagerRequest {
         #[serde(default)]
         ttl_seconds: Option<u64>,
     },
+    /// Fetch recent journal lines for a sub-agent container. hive-c0re
+    /// runs `journalctl -M <agent> -n <lines> --no-pager` and returns
+    /// the output as a string. Useful for diagnosing MCP registration
+    /// failures, startup crashes, and harness errors.
+    ///
+    /// `lines` defaults to 50 when omitted.
+    GetLogs {
+        agent: String,
+        #[serde(default)]
+        lines: Option<u32>,
+    },
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
@@ -502,4 +513,8 @@ pub enum ManagerResponse {
     Recent {
         rows: Vec<InboxRow>,
     },
+    /// `GetLogs` result: journal lines for the requested container.
+    Logs {
+        content: String,
+    },
 }