Reject non-finite sliding-window smoother weights

[FlorianPfaff]

Summary

• validate SlidingWindowManifoldMeanSmoother.window_weights for finiteness before sign and mass checks
• reject NaN, positive infinity, and negative infinity with a clear ValueError
• add focused regression coverage for all three non-finite cases

Bug

SlidingWindowManifoldMeanSmoother checked only whether window_weights were negative and whether their sum was positive.

Those checks do not reject non-finite values:

• comparisons with NaN are false, so a vector containing NaN passed both checks
• a vector containing +inf had positive total mass and was accepted

When an active window was normalized, these values produced NaN weights (NaN / NaN or inf / inf) and consequently non-finite smoothed states.

Fix

Require every configured window weight to be finite using the active backend before applying the existing non-negativity and positive-mass validation.

Validation

• standalone numerical reproduction confirms the previous checks accept both NaN and +inf and normalization produces non-finite weights
• regression covers NaN, +inf, and -inf
• branch is two commits ahead of current main and zero behind
• final diff is limited to four source additions/one import-line adjustment and one focused test module

The full multi-backend test matrix is delegated to GitHub Actions.

[github-actions]

✅MegaLinter analysis: Success

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✅ MARKDOWN	markdownlint	68	0	0	0	1.89s
✅ MARKDOWN	markdown-table-formatter	68	0	0	0	0.69s
✅ PYTHON	black	1490	182	0	0	85.01s
✅ PYTHON	isort	1490	327	0	0	2.51s
✅ REPOSITORY	betterleaks	yes		no	no	2.6s
✅ REPOSITORY	checkov	yes		no	no	51.92s
✅ REPOSITORY	gitleaks	yes		no	no	13.75s
✅ REPOSITORY	git_diff	yes		no	no	0.33s
✅ REPOSITORY	secretlint	yes		no	no	56.82s
✅ REPOSITORY	syft	yes		no	no	5.99s
✅ REPOSITORY	trivy-sbom	yes		no	no	6.08s
✅ REPOSITORY	trufflehog	yes		no	no	30.64s
✅ YAML	prettier	11	0	0	0	0.63s
✅ YAML	v8r	11		0	0	9.66s
✅ YAML	yamllint	11		0	0	0.42s

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[FlorianPfaff]

Closing as an obsolete conflicted stack. This branch carries a large inherited commit chain on an old base, so the focused change cannot be reviewed or repaired safely in place. Recreate the small fix from current main if it is still missing.