Validate negative time-offset max delta

[FlorianPfaff]

Summary

• reject negative max_time_delta_s values in time-offset interpolation
• add regression coverage for invalid negative tolerance input

Rationale

Negative maximum time-delta tolerances cannot have physical meaning. Before this change, time-offset calibration paths accepted them and silently marked all candidate rows invalid/empty instead of surfacing a configuration error. This now matches the bias-calibration helper’s nonnegative tolerance validation.

Testing

• Added tests/calibration/test_time_offset_bias.py::TimeOffsetCalibrationTest::test_interpolation_rejects_negative_max_time_delta
• Local full pytest could not be run because the execution container cannot resolve github.com; PR CI should run the focused calibration test and full matrix.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
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✅ JSON	v8r	7		0	0	4.74s
✅ MARKDOWN	markdownlint	66	0	0	0	1.93s
✅ MARKDOWN	markdown-table-formatter	66	0	0	0	0.78s
✅ PYTHON	black	762	0	0	0	41.7s
✅ PYTHON	isort	762	0	0	0	2.73s
✅ REPOSITORY	checkov	yes		no	no	48.57s
✅ REPOSITORY	gitleaks	yes		no	no	15.76s
✅ REPOSITORY	git_diff	yes		no	no	0.03s
✅ REPOSITORY	secretlint	yes		no	no	24.18s
✅ REPOSITORY	syft	yes		no	no	5.72s
✅ REPOSITORY	trivy-sbom	yes		no	no	6.23s
✅ REPOSITORY	trufflehog	yes		no	no	23.99s
✅ YAML	prettier	11	0	0	0	0.68s
✅ YAML	v8r	11		0	0	11.87s
✅ YAML	yamllint	11		0	0	0.6s

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