fix(exporters): allowlist trekresearch engine field and pin schema fixture agreement

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

tests/lib/doc-consistency.test.mjs

@@ -26,6 +26,7 @@ import { fileURLToPath } from 'node:url';
 import { parseDocument } from '../../lib/util/frontmatter.mjs';
 import { resolveProfile, loadProfile } from '../../lib/profiles/resolver.mjs';
 import { STATES } from '../../lib/util/autonomy-gate.mjs';
+import { TREKRESEARCH_ALLOWED } from '../../lib/exporters/field-allowlist.mjs';
 
 const HERE = dirname(fileURLToPath(import.meta.url));
 const ROOT = join(HERE, '..', '..');
@@ -961,6 +962,31 @@ test('S15: profile tables encode each built-in yaml phase_models exactly', () =>
   }
 });
 
+// STRUCTURAL pin: the exporter allowlist and the authoring fixture must agree.
+// `engine` was emitted, documented in prose, and still dropped at the export
+// boundary because nothing tied the two together. Derives one side from the
+// frozen Set, so it survives rewording of the fixture row.
+test('S74: every TREKRESEARCH_ALLOWED name is declared in the jsonl-schemas fixture row', () => {
+  const row = read('tests/fixtures/jsonl-schemas.md')
+    .split('\n')
+    .find((l) => l.startsWith('| trekresearch-stats '));
+  assert.ok(row, 'jsonl-schemas.md is missing the `trekresearch-stats` row');
+  // Columns: '' | schema_id | fields | writer_path | line_ref | v4.1 additive | PII | ''
+  const cells = row.split('|').map((c) => c.trim());
+  // Both columns are required: profile/profile_source/parallel_agents live in
+  // the `v4.1 additive` column only, so checking `fields` alone fails at once.
+  const declared = new Set(
+    [cells[2], cells[5]].flatMap((c) => c.split(',').map((f) => f.trim())).filter(Boolean),
+  );
+  for (const name of TREKRESEARCH_ALLOWED) {
+    assert.ok(
+      declared.has(name),
+      `\`${name}\` is allowlisted in field-allowlist.mjs but absent from the fixture row's `
+      + '`fields` + `v4.1 additive` columns — fix the SOURCE, not this pin',
+    );
+  }
+});
+
 // --- S34 (V30) — economy is self-declared experimental until the cross-tier
 // Jaccard floor (0.55) is empirically calibrated (Step-17 calibration deferred
 // to v4.2). The status must be visible in BOTH the profile data