add py.typed

[atravitz]

I'm trying to locate a mypy use-case in any downstream package that this will fix before I merge.

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LLM / AI generated code disclosure

LLMs or other AI-powered tools (beyond simple IDE use cases) were used in this contribution: yes / no
If yes, please provide details here:

Checklist

• Added a news entry
• Filled in the AI-generated code disclosure.

Developers certificate of origin

• I certify that this contribution is covered by the MIT License here and the Developer Certificate of Origin at https://developercertificate.org/.

[github-actions]

No API break detected ✅

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Griffe output

$ griffe check "gufe" -s src --no-inspection --no-color --verbose -a origin/main

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.65%. Comparing base (60d4e53) to head (55d4135).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #813   +/-   ##
=======================================
  Coverage   98.65%   98.65%           
=======================================
  Files          43       43           
  Lines        2825     2825           
=======================================
  Hits         2787     2787           
  Misses         38       38           

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