# Phase 121 Summary

Status: implemented on `main`

## Goal

Lock the bounded BibTeX import/export contract before production code lands.

## What Landed

- new helper-level contract coverage in
  `research/knowledge-hub/tests/test_source_bibtex_support.py`
- service, CLI, E2E, and documentation contract coverage for
  `export-source-bibtex` and `import-bibtex-sources`
- a failing-then-passing acceptance contract for the source-catalog lane

## Outcome

Phase `121` is complete.
`v1.63` has a real contract for the BibTeX source surface.
