Hide orphan json fences in chat bubbles (0.15.14).

Co-authored-by: Cursor <cursoragent@cursor.com>

test/patch.test.js

@@ -3,8 +3,10 @@ import assert from 'node:assert/strict';
 import {
   extractPatch,
   isPatchObject,
+  liveStreamProse,
   normalizePatch,
   setPatchKeys,
+  stripFenceArtifacts,
   visibleProse,
 } from '../src/patch.js';
 import {
@@ -63,6 +65,28 @@ describe('patch.js', () => {
     assert.equal(visibleProse('просто чат без патча'), 'просто чат без патча');
   });
 
+  it('extractPatch strips orphan ```json when JSON is unfenced', () => {
+    const text = 'О, круто\n\n```json\n{"prompt":"girl on leather sofa, flirt","generate":true}';
+    const { prose, patch } = extractPatch(text);
+    assert.ok(patch);
+    assert.equal(patch.generate, true);
+    assert.equal(prose, 'О, круто');
+    assert.ok(!prose.includes('```'));
+  });
+
+  it('liveStreamProse hides unclosed fence while streaming', () => {
+    const partial = 'О, круто\n\n```json\n{"prompt":"girl';
+    assert.equal(liveStreamProse(partial), 'О, круто');
+    assert.equal(
+      liveStreamProse('Ок\n```json\n{"prompt":"fox","generate":true}\n```'),
+      'Ок',
+    );
+  });
+
+  it('stripFenceArtifacts removes lone JSON Patch headers', () => {
+    assert.equal(stripFenceArtifacts('### JSON Patch\n'), '');
+  });
+
   it('scheduler-only patch is detected with full key list', () => {
     setPatchKeys(['prompt', 'scheduler', 'generate', 'ask']);
     assert.equal(isPatchObject({ scheduler: 'euler' }), true);