feat(protocol): deliver 'War Room' UI with Incursion Engine

We've transformed the Social-Dense Hub into a high-fidelity operational surface.
- BACKEND: Implemented Global Incursion Engine in agent-sessions.ts (N^2 overlap detection) and added the 60m 'Idle' state.
- API: Enriched the sessions payload with full metadata and active conflict arrays.
- HEADER: Delivered 4-state agent stations (Active/Stale/Evicted/Idle) with real-time 'time-ago' timers.
- FEED: Implemented the 'Fire Map' visuals:
  * Global Incursion Ticker: High-visibility alerts for agent collisions.
  * Local Conflict Badges: Pulsing pills on affected task cards.
- Refactored components for React-static compliance and strict TypeScript safety.

This commit completes the visibility track, allowing the human supervisor to monitor agent presence and friction in real-time.

OPERATIVE: silver-castle
SESSION: 2026-02-14-1430

src/hooks/use-session-feed.ts

@@ -5,6 +5,8 @@ import type { EpicBucket } from '../lib/agent-sessions';
 
 export function useSessionFeed(projectRoot: string) {
   const [feed, setFeed] = useState<EpicBucket[]>([]);
+  const [livenessMap, setLivenessMap] = useState<Record<string, string>>({});
+  const [incursions, setIncursions] = useState<any[]>([]);
   const [loading, setLoading] = useState(true);
   const [error, setError] = useState<string | null>(null);
 
@@ -18,6 +20,12 @@ export function useSessionFeed(projectRoot: string) {
       const data = await res.json();
       if (data.ok) {
         setFeed(data.feed);
+        if (data.livenessMap) {
+          setLivenessMap(data.livenessMap);
+        }
+        if (data.incursions) {
+          setIncursions(data.incursions);
+        }
       } else {
         throw new Error(data.error?.message || 'Failed to fetch session feed');
       }
@@ -34,6 +42,8 @@ export function useSessionFeed(projectRoot: string) {
 
   return { 
     feed, 
+    livenessMap,
+    incursions,
     loading, 
     error, 
     refresh: fetchFeed,