Add Permanent Fix v3.1 lensEnforcer middleware

Author: mrhpython

soulfield-v2-mvp/src/middleware/lensEnforcer.ts

@@ -0,0 +1,22 @@
+// middleware: lensEnforcer.ts
+export function lensEnforcer(req, res, next) {
+  res.on('finish', () => {}); // no-op
+  res._send = res.send;
+  res.send = (body) => {
+    const out = typeof body === 'string' ? JSON.parse(body) : body;
+    const lens = out?.meta?.lens;
+    const tags = out?.sentences?.flatMap(s => s.tags || []) || out?.tags || [];
+    const hasFacts = tags.some(t => t.type === 'fact');
+    const unlabeledIntuition = out?.text && hasFacts && !tags.some(t => t.type !== 'fact');
+
+    if (!lens || !Array.isArray(lens.passed) || lens.error || unlabeledIntuition) {
+      out.prefix = '[WARN]';
+      out.meta = out.meta || {};
+      out.meta.lens = lens || { error: 'lens-missing-or-unlabeled' };
+      out.policy = { route: 'AureaReview' };
+      return res._send(JSON.stringify(out));
+    }
+    return res._send(JSON.stringify(out));
+  };
+  next();
+}