fix: harden long conversation continuity

chat-agent-run-gate.test.mjs

@@ -3,8 +3,10 @@ import test from 'node:test';
 import {
   reconcileSessionEventRequestContext,
   resolvePostAgentRunChatState,
+  shouldIgnoreZeroActivityFinish,
   shouldKeepStreamingAfterRunError,
   shouldPromoteSessionIdToStreaming,
+  shouldScheduleMissingActiveRequestGrace,
 } from './chat-agent-run-gate.mjs';
 
 test('resolvePostAgentRunChatState keeps idle when Finish beat agent-run gate', () => {
@@ -85,6 +87,64 @@ test('shouldPromoteSessionIdToStreaming skips re-streaming after Finish', () =>
   assert.equal(shouldPromoteSessionIdToStreaming('streaming'), true);
 });
 
+test('zero-token Finish cannot unlock a composer with an active request', () => {
+  assert.equal(
+    shouldIgnoreZeroActivityFinish({
+      eventType: 'Finish',
+      hasActiveRequest: true,
+      tokenState: {
+        inputTokens: 0,
+        outputTokens: 0,
+        totalTokens: 0,
+        accumulatedInputTokens: 0,
+        accumulatedOutputTokens: 0,
+        accumulatedTotalTokens: 0,
+      },
+    }),
+    true,
+  );
+  assert.equal(
+    shouldIgnoreZeroActivityFinish({
+      eventType: 'Finish',
+      hasActiveRequest: true,
+      tokenState: { inputTokens: 8, outputTokens: 2, totalTokens: 10 },
+    }),
+    false,
+  );
+  assert.equal(
+    shouldIgnoreZeroActivityFinish({
+      eventType: 'Finish',
+      hasActiveRequest: false,
+      tokenState: { inputTokens: 0, outputTokens: 0, totalTokens: 0 },
+    }),
+    false,
+  );
+});
+
+test('missing ActiveRequests cannot unlock while the Portal agent-run is pending', () => {
+  assert.equal(
+    shouldScheduleMissingActiveRequestGrace({
+      allowMissingGrace: true,
+      agentRunPending: true,
+    }),
+    false,
+  );
+  assert.equal(
+    shouldScheduleMissingActiveRequestGrace({
+      allowMissingGrace: true,
+      agentRunPending: false,
+    }),
+    true,
+  );
+  assert.equal(
+    shouldScheduleMissingActiveRequestGrace({
+      allowMissingGrace: false,
+      agentRunPending: false,
+    }),
+    false,
+  );
+});
+
 test('reconcileSessionEventRequestContext adopts Goose request id while agent-run gate waits', () => {
   assert.deepEqual(
     reconcileSessionEventRequestContext({