feat(rag): label the CrossFirst question with its Item 11 evidence

The 10-K incorporates executive compensation by reference to the 2023 Proxy
Statement — the dollar figures are not in the document, so the recorded LLM
answer ('cannot answer') was correct. The Item 11 passage citing the proxy
statement is the right retrieval evidence; '2023 Proxy Statement' is unique to
the CrossFirst document in this corpus. All 5 questions now score in eval.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PxznqztpBUiRN4FH6pKGun

Author: claude

rag/questions.json

@@ -39,7 +39,10 @@
     "answer": "The provided context does not contain any information about executive compensation amounts or spending on executive compensation. Therefore, I cannot answer this question.",
     "sources": 10,
     "ms": 1648.184236,
-    "mode": "hybrid"
+    "mode": "hybrid",
+    "relevant": [
+      "2023 Proxy Statement"
+    ]
   },
   {
     "question": "Did Holley Inc. mention any mergers or acquisitions in the annual report?",