Validate Murty assignment count

[FlorianPfaff]

Summary

• Reject boolean and non-integral k values in murty_k_best_assignments.
• Preserve existing integer k <= 0 behavior.
• Add regression coverage for True, False, and 1.5.

Testing

• python -m py_compile /tmp/assignment_near.py /tmp/test_assignment.py

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	58.35s
✅ JSON	prettier	7	0	0	0	1.45s
✅ JSON	v8r	7		0	0	4.55s
✅ MARKDOWN	markdownlint	68	0	0	0	1.69s
✅ MARKDOWN	markdown-table-formatter	68	0	0	0	0.88s
✅ PYTHON	black	879	0	0	0	53.12s
✅ PYTHON	isort	879	0	0	0	3.59s
✅ REPOSITORY	checkov	yes		no	no	44.69s
✅ REPOSITORY	gitleaks	yes		no	no	10.18s
✅ REPOSITORY	git_diff	yes		no	no	0.15s
✅ REPOSITORY	secretlint	yes		no	no	25.86s
✅ REPOSITORY	syft	yes		no	no	4.13s
✅ REPOSITORY	trivy-sbom	yes		no	no	8.5s
✅ REPOSITORY	trufflehog	yes		no	no	23.77s
✅ YAML	prettier	11	0	0	0	0.72s
✅ YAML	v8r	11		0	0	10.24s
✅ YAML	yamllint	11		0	0	0.55s

Notices

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