Harden pasted Scattermind thread handoffs

scripts/check-rank-feedback.mjs

@@ -1254,6 +1254,33 @@ try {
   assert.equal(threadsFallback.handoff.readiness.status, 'ready');
   assert.deepEqual(threadsFallback.handoff.warnings, []);
 
+  const pastedThreadOnlyResponse = await fetch(`${base}/api/rank-feedback`, {
+    method: 'POST',
+    headers: { 'Content-Type': 'application/json' },
+    body: JSON.stringify({
+      idea: `Scattermind export:\n\n\`\`\`json\n${JSON.stringify({
+        sourceSummary: 'A source-summary-only Concept Map paste with action threads and no explicit reference code.',
+        actionThreads: [
+          'Start with a manual source-summary proof for one tired user.',
+          'Validate whether the copied handoff tells the user what to do next.',
+          'Hold for later: polished export styling after comprehension proof.',
+          'Set aside: account dashboard with saved workspaces before proof.',
+        ],
+      })}\n\`\`\``,
+      context: 'Avoid account dashboards and saved workspaces before manual proof.',
+      mode: 'mvp',
+    }),
+  });
+  assert.equal(pastedThreadOnlyResponse.status, 200);
+  const pastedThreadOnly = await pastedThreadOnlyResponse.json();
+  assert.equal(pastedThreadOnly.input.embeddedPayloadSource, 'idea');
+  assert.match(pastedThreadOnly.input.provenance.sourceSummary, /source-summary-only Concept Map/);
+  assert.equal(pastedThreadOnly.input.optionCount, 4);
+  assert.equal(pastedThreadOnly.ranked[0].id, 'action-thread-1');
+  assert.equal(pastedThreadOnly.ranked.find(item => item.id === 'action-thread-4').lane.id, 'park');
+  assert.equal(pastedThreadOnly.handoff.readiness.status, 'ready');
+  assert.deepEqual(pastedThreadOnly.handoff.warnings, []);
+
   const questionsFallbackResponse = await fetch(`${base}/api/rank-feedback`, {
     method: 'POST',
     headers: { 'Content-Type': 'application/json' },