Raise TypeError on bare @requires_crt, fix existing bare @requires_crt usages, and add regression tests

[Alan4506]

Background:
requires_crt is used to skip tests when the optional CRT dependency is not installed. The only supported form should be @requires_crt(). However, the current codebase mixes both @requires_crt and @requires_crt() forms. Using bare @requires_crt is unsafe because requires_crt is implemented as a decorator factory. Python passes the test function as the reason argument, causing the real test body to never run. Assertions are never evaluated, but the test may still appear to pass or skip silently.

Description of changes:
This PR makes bare @requires_crt fail immediately with a TypeError. Four existing bare @requires_crt usages across test files are updated to @requires_crt().

Testing:
Regression tests are added to verify correct behavior. All tests including the new tests pass.

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.41%. Comparing base (c4681b5) to head (8268193).
⚠️ Report is 185 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #10129      +/-   ##
===========================================
+ Coverage    93.39%   93.41%   +0.02%     
===========================================
  Files          210      210              
  Lines        17052    17150      +98     
===========================================
+ Hits         15925    16020      +95     
- Misses        1127     1130       +3     

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