[berezovskyi]

Summary

• Replace whitelist/blacklist terminology in the tooling with allowlist/denylist.
• Rename the namespace helper class and update all its callers.
• Add a GitHub Actions Maven test check for tools/tools-common, the module changed here.

Validation

• git diff --check passes and the workflow YAML parses successfully.
• The targeted Maven CI check passes.
• A broader Maven sweep reached tools/examplechecker, where three fixture-output assertions fail; that module is outside this change.

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