feat(dashboard): AgentModal live working feed & thinking stream

backend/Controllers/DashboardController.cs

@@ -343,6 +343,23 @@ public class DashboardController(
         }
     }
 
+    /// <summary>
+    /// Returns the most recent activity entries (assistant messages) for a specific agent.
+    /// </summary>
+    [HttpGet("agents/{id}/activity")]
+    public async Task<List<AgentActivityEntry>> GetAgentActivity(string id, [FromQuery] int limit = 5)
+    {
+        try
+        {
+            return await gateway.GetAgentActivityAsync(id, Math.Clamp(limit, 1, 20));
+        }
+        catch (Exception ex)
+        {
+            logger.LogWarning(ex, "GetAgentActivity failed for {AgentId}", id);
+            return new List<AgentActivityEntry>();
+        }
+    }
+
     /// <summary>
     /// Returns the list of available models that can be assigned to agents.
     /// Reads from OpenClaw config dynamically, falls back to hardcoded list.