Improve public API registry docs

[FlorianPfaff]

Summary

• add public API registry documentation and supporting generation/check scripts
• extend CI/static-analysis/security workflow coverage
• tighten lazy export and backend capability coverage around filters

Validation

• ruff check --fix on changed Python files
• git diff --check origin/main..HEAD
• tests not run per request

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	23.7s
✅ MARKDOWN	markdownlint	5	0	0	0	0.85s
✅ MARKDOWN	markdown-table-formatter	5	0	0	0	0.48s
✅ PYTHON	black	5	2	0	0	2.02s
✅ PYTHON	isort	5	2	0	0	0.43s
✅ REPOSITORY	checkov	yes		no	no	29.74s
✅ REPOSITORY	gitleaks	yes		no	no	15.79s
✅ REPOSITORY	git_diff	yes		no	no	0.04s
✅ REPOSITORY	secretlint	yes		no	no	12.9s
✅ REPOSITORY	syft	yes		no	no	8.08s
✅ REPOSITORY	trivy-sbom	yes		no	no	3.42s
✅ REPOSITORY	trufflehog	yes		no	no	20.04s
✅ YAML	prettier	1	0	0	0	0.46s
✅ YAML	v8r	1		0	0	1.95s
✅ YAML	yamllint	1		0	0	0.44s

Notices

📣 MegaLinter 9.5.0 is out! Discover the new features and security recommendations in the release announcement. (Skip this info by defining SECURITY_SUGGESTIONS: false)

See detailed reports in MegaLinter artifacts
Set VALIDATE_ALL_CODEBASE: true in mega-linter.yml to validate all sources, not only the diff

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[github-actions]

Test Results

0 files   -     10  0 suites   - 10   0s ⏱️ - 2h 40m 25s
0 tests  -  1 956  0 ✅  -  1 952  0 💤  -     4  0 ❌ ±0 
0 runs   - 19 985  0 ✅  - 16 404  0 💤  - 3 581  0 ❌ ±0 

Results for commit 8def6d8. ± Comparison against base commit d13d78e.

♻️ This comment has been updated with latest results.