Use 5-minute load average for CPU status calculation

Change CPU load status to use load_5min instead of load_1min for more
stable status reporting. 5-minute average smooths out temporary spikes
and provides better indication of sustained load.

- Change load_status calculation from load_1min to load_5min
- Add comment explaining use of 5-minute average for stability
- Update version to v0.1.254

agent/src/collectors/cpu.rs

@@ -282,8 +282,8 @@ impl Collector for CpuCollector {
             );
         }
 
-        // Calculate status using thresholds
-        agent_data.system.cpu.load_status = self.calculate_load_status(agent_data.system.cpu.load_1min);
+        // Calculate status using thresholds (use 5-minute average for stability)
+        agent_data.system.cpu.load_status = self.calculate_load_status(agent_data.system.cpu.load_5min);
         agent_data.system.cpu.temperature_status = if let Some(temp) = agent_data.system.cpu.temperature_celsius {
             self.calculate_temperature_status(temp)
         } else {