Make calibration hotfixes reload-safe

[FlorianPfaff]

Bug

pyrecest.calibration patches helpers in calibration.time_offset and calibration.bias at import time. On importlib.reload(pyrecest.calibration), the module previously captured its already-patched wrappers as the new “base” functions. Because those wrappers resolve their base functions through the reloaded module globals, aggregation and bias-calibration calls then recurse until RecursionError.

This affects notebook autoreload, interactive development, test isolation, and applications that deliberately reload modules.

Fix

• preserve the original time-offset and bias helper functions on their owning modules before applying calibration patches;
• always bind reload-time wrappers to those preserved originals;
• make the public aggregate_time_offset_sweeps patch reload-idempotent as well;
• add a regression that reloads pyrecest.calibration twice and exercises both aggregation and bias-example generation after each reload.

Validation

• reproduced the pre-fix aggregation and bias recursion in an isolated harness matching the current patch/reload behavior;
• verified the patched wrappers survive three consecutive reloads in the same harness;
• syntax-compiled the modified module and regression test;
• branch is 2 commits ahead of and 0 behind current main, with changes limited to the calibration initializer and one focused test.

GitHub Actions will provide the full supported Python/backend and lint validation matrix.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	25.86s
✅ JSON	prettier	7	0	0	0	1.12s
✅ JSON	v8r	7		0	0	4.67s
✅ MARKDOWN	markdownlint	68	0	0	0	1.93s
✅ MARKDOWN	markdown-table-formatter	68	0	0	0	0.56s
✅ PYTHON	black	1810	57	0	0	95.01s
✅ PYTHON	isort	1810	89	0	0	2.81s
✅ REPOSITORY	betterleaks	yes		no	no	2.26s
✅ REPOSITORY	checkov	yes		no	no	54.67s
✅ REPOSITORY	gitleaks	yes		no	no	17.47s
✅ REPOSITORY	git_diff	yes		no	no	0.3s
✅ REPOSITORY	secretlint	yes		no	no	80.6s
✅ REPOSITORY	syft	yes		no	no	6.92s
✅ REPOSITORY	trivy-sbom	yes		no	no	7.42s
✅ REPOSITORY	trufflehog	yes		no	no	32.12s
✅ YAML	prettier	11	0	0	0	0.72s
✅ YAML	v8r	11		0	0	11.69s
✅ YAML	yamllint	11		0	0	0.6s

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