Fix von Mises moment inversion edge cases

[FlorianPfaff]

Summary

• replace the unconstrained fsolve-based Bessel-ratio inverse with a bracketed scalar solve
• validate first trigonometric moment magnitudes before moment matching
• handle the zero-moment uniform case explicitly and reject degenerate/infeasible moments
• add regression tests for moment reconstruction and invalid boundary values

Notes

I did not run the test suite locally in this environment. Suggested check:

python -m pytest tests/distributions/test_von_mises_distribution.py

[github-actions]

Test Results

    12 files  ± 0      12 suites  ±0   2h 23m 0s ⏱️ + 10m 10s
 1 838 tests + 5   1 837 ✅ + 5      1 💤 ±0  0 ❌ ±0 
22 568 runs  +60  18 004 ✅ +60  4 564 💤 ±0  0 ❌ ±0 

Results for commit 1bac057. ± Comparison against base commit 7f90866.

♻️ This comment has been updated with latest results.

[github-actions]

✅MegaLinter analysis: Success

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[FlorianPfaff]

@copilot Fix merge conflicts

[Copilot]

@copilot Fix merge conflicts

Merge conflicts resolved in commit 38e83a1. Kept the cleaner HEAD implementation (isfinite, _MOMENT_NORM_TOL/_BESSEL_RATIO_EDGE_TOL constants, float returns from besselratio_inverse) and combined the test files by retaining the HEAD tests plus adding test_convolution_of_uniform_components_remains_uniform from main. All 10 tests pass.