Support SCGP measurement reliability weights

[FlorianPfaff]

Summary

• finish FullSCGPTracker per-measurement reliability support with shared or per-measurement R
• keep zero-weight and masked measurements out of the stacked update
• add tests, docs, and a runnable example for reliability-weighted SCGP updates

Validation

• PYTHONPATH=src python -m pytest tests/filters/test_scgp_tracker.py
• PYTHONPATH=src python examples/basic/scgp_measurement_reliability.py
• PYTHONPATH=src python -m pytest --basetemp .pytest-tmp

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	14.76s
✅ MARKDOWN	markdownlint	4	0	0	0	0.64s
✅ MARKDOWN	markdown-table-formatter	4	0	0	0	0.34s
✅ PYTHON	black	3	0	0	0	1.38s
✅ PYTHON	isort	3	0	0	0	0.68s
✅ REPOSITORY	checkov	yes		no	no	22.09s
✅ REPOSITORY	gitleaks	yes		no	no	7.34s
✅ REPOSITORY	git_diff	yes		no	no	0.03s
✅ REPOSITORY	secretlint	yes		no	no	6.94s
✅ REPOSITORY	syft	yes		no	no	1.31s
✅ REPOSITORY	trivy-sbom	yes		no	no	2.2s
✅ REPOSITORY	trufflehog	yes		no	no	10.43s

Notices

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[github-actions]

Test Results

    10 files  ± 0      10 suites  ±0   2h 29m 44s ⏱️ - 4m 0s
 2 035 tests + 2   2 031 ✅ +2      4 💤 ± 0  0 ❌ ±0 
20 775 runs  +20  17 167 ✅ +8  3 608 💤 +12  0 ❌ ±0 

Results for commit 94fbd49. ± Comparison against base commit 8cf152a.