fix: harden long conversation continuity

chat-agent-run-gate.mjs

@@ -31,6 +31,47 @@ export function shouldPromoteSessionIdToStreaming(chatState) {
   return chatState !== 'idle';
 }
 
+/**
+ * A newly created Goose session can replay an empty Finish frame before the
+ * current model request produces any activity. While a visible request is
+ * active, that frame must not unlock the composer.
+ *
+ * @param {{ eventType?: string; tokenState?: object | null; hasActiveRequest?: boolean }} input
+ * @returns {boolean}
+ */
+export function shouldIgnoreZeroActivityFinish({
+  eventType,
+  tokenState,
+  hasActiveRequest = false,
+} = {}) {
+  if (eventType !== 'Finish' || !hasActiveRequest || !tokenState) return false;
+  const values = [
+    tokenState.inputTokens,
+    tokenState.outputTokens,
+    tokenState.totalTokens,
+    tokenState.accumulatedInputTokens,
+    tokenState.accumulatedOutputTokens,
+    tokenState.accumulatedTotalTokens,
+  ].filter((value) => value != null);
+  return values.length > 0 && values.every((value) => Number(value) === 0);
+}
+
+/**
+ * The session stream can temporarily report no Goose request while the
+ * Portal agent-run is still authoritative and pending. Do not start the
+ * missing-request idle timer until that outer run has reached a terminal
+ * state.
+ *
+ * @param {{ allowMissingGrace?: boolean; agentRunPending?: boolean }} input
+ * @returns {boolean}
+ */
+export function shouldScheduleMissingActiveRequestGrace({
+  allowMissingGrace = false,
+  agentRunPending = false,
+} = {}) {
+  return allowMissingGrace && !agentRunPending;
+}
+
 /**
  * Only transport uncertainty may continue a run after submit fails. A
  * deterministic gateway error already has a terminal outcome and must return