[user27182]

Fixes the Linux wheel builds, which failed to compile the C extension against the 3.11 limited API.

• Py_INCREF and Py_XDECREF get a PyObject * cast for NumPy descriptors, arrays and the context object, since the 3.11 limited API declares them as functions.
• fast.h includes <stdio.h> for snprintf, which Python.h no longer provides.

🤖 Generated with Claude Code (Claude Opus 5.5)

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.74%. Comparing base (9173893) to head (ad96cfe).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #50   +/-   ##
=======================================
  Coverage   99.74%   99.74%           
=======================================
  Files          11       11           
  Lines        1167     1167           
  Branches      135      135           
=======================================
  Hits         1164     1164           
  Misses          1        1           
  Partials        2        2           

Flag	Coverage Δ
tests	99.46% <ø> (ø)
typing	97.88% <ø> (ø)

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