fix: dashboard — coverage pillar, active alerts env fallback

- Add coverage pillar to /api/health response and _serialize_health_score
- Add coverage to MeshHealth.pillars TypeScript interface
- Add Coverage PillarBar between Utilization and Behavior
- Active Alerts panel: show high-severity env events (immediate/priority)
  as fallback when mesh alerts are empty, with ENV badge

Issues 3 (Live Event Feed) and 4 (RF Propagation): diagnosed as
env feed configuration — SWPC adapter disabled, only ducting feed
loaded, /api/env/active returns 0 events. Not a code bug.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

dashboard-frontend/src/lib/api.ts

@@ -19,6 +19,7 @@ export interface MeshHealth {
   pillars: {
     infrastructure: number
     utilization: number
+    coverage: number
     behavior: number
     power: number
   }

dashboard-frontend/src/pages/Dashboard.tsx

@@ -696,6 +696,7 @@ export default function Dashboard() {
               <div className="mt-6 space-y-3">
                 <PillarBar label="Infrastructure" value={health.pillars?.infrastructure ?? 0} />
                 <PillarBar label="Utilization" value={health.pillars?.utilization ?? 0} />
+                <PillarBar label="Coverage" value={health.pillars?.coverage ?? 0} />
                 <PillarBar label="Behavior" value={health.pillars?.behavior ?? 0} />
                 <PillarBar label="Power" value={health.pillars?.power ?? 0} />
               </div>
@@ -714,12 +715,48 @@ export default function Dashboard() {
                   <AlertItem key={i} alert={alert} />
                 ))}
               </div>
-            ) : (
-              <div className="flex items-center gap-2 text-slate-500 py-4">
-                <CheckCircle size={16} className="text-green-500" />
-                <span>No active alerts</span>
-              </div>
-            )}
+            ) : (() => {
+              const highSeverityEnv = envEvents
+                .filter(e => e.severity === 'immediate' || e.severity === 'priority')
+                .sort((a, b) => {
+                  const ord: Record<string, number> = { immediate: 0, priority: 1 }
+                  const diff = (ord[a.severity] ?? 2) - (ord[b.severity] ?? 2)
+                  if (diff !== 0) return diff
+                  return (b.fetched_at || 0) - (a.fetched_at || 0)
+                })
+                .slice(0, 5)
+              if (highSeverityEnv.length > 0) {
+                return (
+                  <div className="space-y-3 max-h-48 overflow-y-auto">
+                    {highSeverityEnv.map((ev, i) => {
+                      const sevStyle = ev.severity === 'immediate'
+                        ? { bg: 'bg-red-500/10', border: 'border-red-500', icon: AlertCircle, iconColor: 'text-red-500' }
+                        : { bg: 'bg-amber-500/10', border: 'border-amber-500', icon: AlertTriangle, iconColor: 'text-amber-500' }
+                      const Icon = sevStyle.icon
+                      return (
+                        <div key={ev.event_id || i} className={`p-3 rounded-lg ${sevStyle.bg} border-l-2 ${sevStyle.border} flex items-start gap-3`}>
+                          <Icon size={16} className={sevStyle.iconColor} />
+                          <div className="flex-1 min-w-0">
+                            <div className="flex items-center gap-2">
+                              <span className="px-1.5 py-0.5 rounded text-xs bg-slate-500/20 text-slate-400 border border-slate-500/30 font-mono">ENV</span>
+                              <span className="text-xs text-slate-500">{ev.severity}</span>
+                            </div>
+                            <div className="text-sm text-slate-200 mt-1">{ev.headline}</div>
+                            <div className="text-xs text-slate-500 mt-1">{ev.source} · {new Date(ev.fetched_at * 1000).toLocaleTimeString()}</div>
+                          </div>
+                        </div>
+                      )
+                    })}
+                  </div>
+                )
+              }
+              return (
+                <div className="flex items-center gap-2 text-slate-500 py-4">
+                  <CheckCircle size={16} className="text-green-500" />
+                  <span>No active alerts</span>
+                </div>
+              )
+            })()}
           </div>
 
           {/* Quick Stats */}

meshai/dashboard/api/mesh_routes.py

@@ -15,6 +15,7 @@ def _serialize_health_score(score) -> dict:
         "tier": score.tier,
         "infrastructure": round(score.infrastructure, 1),
         "utilization": round(score.utilization, 1),
+        "coverage": round(score.coverage, 1),
         "behavior": round(score.behavior, 1),
         "power": round(score.power, 1),
         "infra_online": score.infra_online,
@@ -73,6 +74,7 @@ async def get_health(request: Request):
         "pillars": {
             "infrastructure": round(score.infrastructure, 1),
             "utilization": round(score.utilization, 1),
+            "coverage": round(score.coverage, 1),
             "behavior": round(score.behavior, 1),
             "power": round(score.power, 1),
         },

meshai/dashboard/static/index.html

@@ -8,8 +8,8 @@
     <link rel="preconnect" href="https://fonts.googleapis.com">
     <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
     <link href="https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;600;700&display=swap" rel="stylesheet">
-    <script type="module" crossorigin src="/assets/index-CM6OazXs.js"></script>
-    <link rel="stylesheet" crossorigin href="/assets/index-Dp9XCfH-.css">
+    <script type="module" crossorigin src="/assets/index-BCcZxs_h.js"></script>
+    <link rel="stylesheet" crossorigin href="/assets/index-BEgceSNC.css">
   </head>
   <body>
     <div id="root"></div>