- chunk_bboxes is now dict[int, list[tuple[...]]] holding the bbox list
directly, not {"bbox": ..., "page": ...}. The page from text-search was
stored but never read; page_number from offset-based assignment is
authoritative for the Qdrant payload.
- Add two unit tests for the documented omission contract: chunks whose
offsets fall outside every page boundary, and chunks whose text cannot
be located on the rendered page, are silently dropped from the result.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>