Bump AWF firewall version to v0.25.42

[lpcox]

Summary

Bump the AWF (Agentic Workflow Firewall) dependency to v0.25.42.

What's new in v0.25.42

Please check the release notes for the full changelog. Recent releases include:

• Effective token budget enforcement documentation (spec §10, schema descriptions, api-proxy docs)
• Runtime JSONL schema references added to the AWF config spec
• Multi-provider OIDC authentication support (Azure, AWS, GCP)
• Export audit fixes
• Spec/CLI mapping sync improvements

Action items

• Update the firewall version pin to v0.25.42 in gh-aw
• Run gh aw upgrade to regenerate lock files with the new version
• Verify smoke tests pass with the updated version