Add Euclidean boxed particle filter

[FlorianPfaff]

Summary

• Add EuclideanBoxedParticleFilter / BoxedParticleFilter as a point-particle boxed-PF variant, distinct from the existing box-particle filter.
• Keep the filter state as a LinearDiracDistribution; boxes are used as proposal/support regions for generation, gating, and updates.
• Support boxed generation via uniform sampling, accept/resample from in-box particles, upsampling from a proposal, inscribed Gaussian sampling, and reweighting by a box constraint.
• Add tests covering point-particle state, uniform generation, accept/resample generation, proposal upsampling, inscribed Gaussian generation, identity-box gating, and nonlinear boxed prediction.

Validation

• Syntax-checked the new module and test file locally with python -m py_compile.
• Not run locally: full repository dependencies are not available in this execution environment.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	17.99s
✅ JSON	prettier	2	0	0	0	0.44s
✅ JSON	v8r	2		0	0	2.44s
✅ MARKDOWN	markdownlint	28	0	0	0	1.25s
✅ MARKDOWN	markdown-table-formatter	28	0	0	0	0.25s
✅ PYTHON	bandit	521		0	0	7.83s
✅ PYTHON	black	521	1	0	0	13.04s
✅ PYTHON	flake8	521		0	0	4.58s
✅ PYTHON	isort	521	1	0	0	0.81s
✅ PYTHON	mypy	521		0	0	6.18s
✅ PYTHON	pylint	521		0	0	107.58s
✅ PYTHON	ruff	521	1	0	0	0.09s
✅ REPOSITORY	checkov	yes		no	no	19.51s
✅ REPOSITORY	gitleaks	yes		no	no	10.94s
✅ REPOSITORY	git_diff	yes		no	no	0.07s
✅ REPOSITORY	secretlint	yes		no	no	10.01s
✅ REPOSITORY	syft	yes		no	no	3.18s
✅ REPOSITORY	trivy-sbom	yes		no	no	3.44s
✅ REPOSITORY	trufflehog	yes		no	no	20.93s
✅ YAML	prettier	5	0	0	0	0.49s
✅ YAML	v8r	5		0	0	4.7s
✅ YAML	yamllint	5		0	0	0.43s

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