fix: include matching body sections despite nonempty semantic recall

backend/wisegrade/rag.py

@@ -391,11 +391,16 @@ def retrieve_targets(db, *, course_version_id: int, project_id: int, targets: li
                                substantive_only=target.get("use") != "structure",
                                semantic_pool=SEMANTIC_POOL, keyword_pool=KEYWORD_POOL)
         hits = [normalize_hit(hit) for hit in (raw_hits or [])]
-        if target.get("use") == "content" and not hits and navigator is not None:
+        if target.get("use") == "content" and navigator is not None:
             # The contents list may only be used to navigate: its headings are matched
             # against headings that really occur in body text, and those sections and
             # their neighbouring pages are searched. The quotation still lands on body.
-            hits = [dict(hit, via="toc_navigation") for hit in (navigator(target) or [])]
+            # Semantic recall always returns neighbours, even for a short vague
+            # query. Supplement it with matching body sections rather than waiting
+            # for zero hits, and keep those sections ahead of incidental matches.
+            navigated = [normalize_hit(hit) for hit in (navigator(target) or [])]
+            seen_ids = {hit["chunk_id"] for hit in navigated}
+            hits = navigated + [hit for hit in hits if hit["chunk_id"] not in seen_ids]
         per_target[target["target_id"]] = hits
         for hit in hits:
             if hit["chunk_id"] not in seen: