v0.9.1

Fixed

• ygg seed crashed at import on Python 3.10/3.11 — the 0.8.0 seed summary
  used a multi-line f-string replacement field (PEP 701, python 3.12+ only), so
  the module didn't even parse on older interpreters. 0.8.0 and 0.9.0 on PyPI
  are affected; upgrade.
• The release pipeline now syntax-checks the package on the oldest supported
  Python (3.10 via uv) before publishing, so a 3.12-only construct can't ship
  again.