Reject non-finite OOSM lag windows

[FlorianPfaff]

Summary

• validate optional fixed-lag windows through one shared coercion helper
• reject NaN and positive/negative infinity in both buffer and replay-updater constructors
• add a regression across FixedLagBuffer, MeasurementTimeBuffer, and OutOfSequenceParticleUpdater

Root cause

FixedLagBuffer and _EventReplayMixin converted max_lag with float() and only checked whether the result was negative. NaN passes that comparison. In FixedLagBuffer._trim(), the resulting cutoff is NaN, so every item.time >= cutoff_time comparison is false and an append silently empties the buffer. The replay wrapper likewise receives invalid window comparisons and trimming behavior.

Impact

A non-finite lag configuration no longer produces silent data loss or invalid replay-window decisions. None remains the supported unlimited-window setting, and finite nonnegative values retain their existing behavior.

Validation

• reproduced the old NaN cutoff behavior in isolation
• exercised the shared coercion helper against NaN, both infinities, negative values, overflow-sized integers, None, zero, and finite positive values
• compared the branch with main: two files changed, 14 production additions / 6 deletions, plus one focused 37-line regression
• full repository and backend validation is delegated to GitHub Actions

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	25.2s
✅ JSON	prettier	7	0	0	0	1.21s
✅ JSON	v8r	7		0	0	4.89s
✅ MARKDOWN	markdownlint	68	0	0	0	1.91s
✅ MARKDOWN	markdown-table-formatter	68	0	0	0	0.73s
✅ PYTHON	black	1490	183	0	0	97.22s
✅ PYTHON	isort	1490	328	0	0	2.66s
✅ REPOSITORY	betterleaks	yes		no	no	2.6s
✅ REPOSITORY	checkov	yes		no	no	55.55s
✅ REPOSITORY	gitleaks	yes		no	no	15.04s
✅ REPOSITORY	git_diff	yes		no	no	0.4s
✅ REPOSITORY	secretlint	yes		no	no	64.56s
✅ REPOSITORY	syft	yes		no	no	6.28s
✅ REPOSITORY	trivy-sbom	yes		no	no	7.42s
✅ REPOSITORY	trufflehog	yes		no	no	32.43s
✅ YAML	prettier	11	0	0	0	0.77s
✅ YAML	v8r	11		0	0	12.77s
✅ YAML	yamllint	11		0	0	0.64s

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