fix: expose summaryStored in session status to detect silent summary loss (#1633)

Stop hook polled queueLength===0 as a proxy for summary success, but the queue
empties regardless of whether the LLM produced valid <summary> tags. Added
lastSummaryStored tracking on ActiveSession, surfaced via the /api/sessions/status
endpoint, and emit a logger.warn in the Stop hook when summaryStored===false.

Generated by Claude Code
Vibe coded by ousamabenyounes

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

src/services/worker-types.ts

@@ -43,6 +43,9 @@ export interface ActiveSession {
   processingMessageIds: number[];
   // Tier routing: model override per session based on queue complexity
   modelOverride?: string;
+  // Track whether the most recent storage operation persisted a summary record.
+  // Used by the status endpoint so the Stop hook can detect silent summary loss (#1633).
+  lastSummaryStored?: boolean;
 }
 
 export interface PendingMessage {

src/services/worker/agents/ResponseProcessor.ts

@@ -126,6 +126,10 @@ export async function processAgentResponse(
     memorySessionId: session.memorySessionId
   });
 
+  // Track whether a summary record was stored so the status endpoint can expose this
+  // to the Stop hook for silent-summary-loss detection (#1633)
+  session.lastSummaryStored = result.summaryId !== null;
+
   // CLAIM-CONFIRM: Now that storage succeeded, confirm all processing messages (delete from queue)
   // This is the critical step that prevents message loss on generator crash
   const pendingStore = sessionManager.getPendingMessageStore();

src/services/worker/http/routes/SessionRoutes.ts

@@ -672,6 +672,9 @@ export class SessionRoutes extends BaseRouteHandler {
       status: 'active',
       sessionDbId,
       queueLength,
+      // Expose whether the last storage operation included a summary record.
+      // The Stop hook uses this to detect silent summary loss when the queue empties (#1633).
+      summaryStored: session.lastSummaryStored ?? null,
       uptime: Date.now() - session.startTime
     });
   });