Harden metric parameter validation

[FlorianPfaff]

Summary

• Add explicit validators for non-negative finite probability-normalization tolerance and positive-integer metric parameters.
• Reject malformed n_bins and k values before metric computations instead of relying on implicit NumPy/Python coercions.
• Add regression coverage for malformed tolerance, calibration-bin, and top-k parameters while preserving integer-like float inputs such as 2.0.

Validation

• Branch diff against main: 2 commits ahead, 0 behind.
• Focused regression tests added in tests/test_metrics.py; full validation should run in PR CI.

Risk and compatibility

• Valid existing calls are unchanged, including integer-like float values for n_bins.
• Invalid booleans, NaN/inf, fractional, zero, and negative parameter values now fail fast with actionable ValueErrors.

[github-actions]

Test Results

    4 files  ± 0      4 suites  ±0   1m 30s ⏱️ -14s
  658 tests +17    649 ✅ +17   9 💤 ±0  0 ❌ ±0 
2 632 runs  +68  2 596 ✅ +68  36 💤 ±0  0 ❌ ±0 

Results for commit f195b7d. ± Comparison against base commit 8545378.

[github-actions]

✅⚠️MegaLinter analysis: Success with warnings

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ ACTION	actionlint	14		0	0	0.49s
✅ COPYPASTE	jscpd	yes		no	no	7.81s
⚠️ MARKDOWN	markdownlint	55	0	1	0	1.77s
✅ PYTHON	ruff	246	0	0	0	0.39s
✅ REPOSITORY	git_diff	yes		no	no	0.03s
✅ YAML	prettier	48	0	0	0	1.61s
✅ YAML	v8r	48		0	0	7.9s
✅ YAML	yamllint	48		0	0	1.09s

Detailed Issues

⚠️ MARKDOWN / markdownlint - 1 error

.github/PULL_REQUEST_TEMPLATE.md:1 error MD041/first-line-heading/first-line-h1 First line in a file should be a top-level heading [Context: "## Summary"]

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