fix(session): harden usage accounting and memory flush recovery

src/auto-reply/reply/agent-runner.ts

@@ -715,6 +715,11 @@ export async function runReplyAgent(params: {
       queueKey,
       runFollowupTurn,
     );
+  } catch (error) {
+    // Keep the followup queue moving even when an unexpected exception escapes
+    // the run path; the caller still receives the original error.
+    finalizeWithFollowup(undefined, queueKey, runFollowupTurn);
+    throw error;
   } finally {
     blockReplyPipeline?.stop();
     typing.markRunComplete();