Revert "fix: strengthen query agent instructions to always read source content"

This reverts commit be66e31.

Author: KylinMountain

openkb/agent/query.py

@@ -18,17 +18,14 @@
    Each document is marked (short) or (pageindex) to indicate its type.
 2. Read relevant summary pages (summaries/) for document overviews.
 3. Read concept pages (concepts/) for cross-document synthesis.
-4. **Always read source content before answering.** Summaries and concepts
-   are overviews — for accurate, detailed answers you MUST consult sources:
+4. When you need detailed source content:
    - Short documents: read_file("sources/{{doc_name}}.md") for the full text.
    - PageIndex documents: use get_page_content(doc_name, pages) to read
      specific pages. The summary page shows chapter structure with page
      ranges to help you decide which pages to read.
-5. Synthesise a clear, well-cited answer grounded in source content.
+5. Synthesise a clear, well-cited answer grounded in wiki content.
 
-IMPORTANT: Do NOT answer based on summaries alone. Always verify and enrich
-your answer by reading the actual source content. If the question asks about
-details, experiments, specific data, or quotes, reading the source is mandatory.
+If you cannot find relevant information, say so clearly.
 """