- Add chunk_start_offset / chunk_end_offset to _PAYLOAD_INDEX_FIELDS so
the legacy offset-based fallback in search/context.py works on Qdrant
Cloud strict mode (pre-#75 clients have no chunk_index payload).
- Cover chunk_index / chunk_start_offset / chunk_end_offset in the
payload-index summary test; refresh the stale field-list comment.
- Flag the is_valid_nextcloud_doc_id gate at both chunk-context handler
sites with a TODO for future non-numeric doc_types.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>