fix: expand secret-like token redaction

[CoderDeltaLAN]

Summary

• Add secret-like redaction coverage for Hugging Face, Slack, and npm-style tokens.
• Add focused redaction tests for the new supported token families.
• Keep the change scoped to redaction behavior and tests only.

Verification

• PYTHONPATH=src python -m unittest tests.test_redaction -v
• ./scripts/check.sh
• workflow_dispatch CI on branch: 27619476273