fix: improve changelog extraction in publish script

- Simplified awk extraction without aggressive sed cleanup
- Now correctly extracts version-specific changelog entries
- Works with minimal or full changelog sections

scripts/publish_release.sh

@@ -33,10 +33,15 @@ extract_changelog() {
   fi
 
   awk -v ver="## $version" '
-    /^## [0-9]/ { if (found) exit; if ($0 ~ ver) found=1; next }
-    found && /^## / { exit }
+    /^## / {
+      if (found) exit
+      if ($0 ~ ver) {
+        found=1
+        next
+      }
+    }
     found { print }
-  ' "$changelog_file" | sed '1d;$d' | sed -e 's/^[[:space:]]*$//' | sed -e :a -e '/^\s*$/d;N;ba'
+  ' "$changelog_file"
 }
 
 CHANGELOG_BODY="$(extract_changelog "$VERSION" "$CHANGELOG_FILE")"