fix: Handle association document versions 0.6.0 and 0.7.0 in guidelines store

The association schema hasn't changed since 0.5.0, but the document
loader needs to handle the newer version strings.

Signed-off-by: Laurits Søgaard Nielsen <lsn@werktoej.dk>

Author: lauritssn

src/parlant/core/guidelines.py

@@ -376,7 +376,8 @@ async def _association_document_loader(
                 tag_id=d["tag_id"],
             )
 
-        if doc["version"] == "0.5.0":
+        # 0.5.0+ all use the same schema - no migration needed
+        if doc["version"] in ("0.5.0", "0.6.0", "0.7.0"):
             return cast(GuidelineTagAssociationDocument, doc)
 
         return None