Add TSCM support to distributed agent with local mode parity

- Agent TSCM uses same ThreatDetector and CorrelationEngine as local mode
- Added baseline_id parameter support using get_tscm_baseline()
- Fixed RF scan stop_check to allow agent-specific stop events
- Fixed 'undefined MHz' display for WiFi devices (added essid fallback and null check)
- Fixed signal strength type conversion (string to int) for correlation engine
- Agent threat detection matches local mode behavior:
  - No baseline: detects anomaly/hidden_camera threats only
  - With baseline: also detects new_device threats

static/js/core/agents.js

@@ -106,7 +106,7 @@ function updateAgentHealthUI() {
     const selector = document.getElementById('agentSelect');
     if (!selector) return;
 
-    // Update each option in selector
+    // Update each option in selector with status and latency
     agents.forEach(agent => {
         const option = selector.querySelector(`option[value="${agent.id}"]`);
         if (option) {