Debug: Add JWKS configuration logging

[jchris]

Summary

• Add temporary debug logging to diagnose JWT verification failures with preset keys
• Improve error messages to show both preset key and JWKS URL verification attempts
• Test deployment with dual-key configuration (production + development keys)

Debug Logging Added

dashboard/backend/create-handler.ts:67-68

• Log number of keys and URLs loaded from environment
• Preview first key format

core/runtime/sts-service/index.ts:372-378

• Log preset key verification attempts
• Show coercion results
• Track success/failure for each key

core/runtime/sts-service/index.ts:414

• Enhanced error message to include preset key count

Test Results

✅ Local test confirms wellKnown --jsons correctly parses both PEM blocks:

{"keys":[{...key1...}, {...key2...}]}

Next Steps

1. Deploy to dev environment
2. Check Cloudflare Workers logs via wrangler tail --env dev
3. Identify why preset keys aren't working
4. Fix root cause
5. Remove debug logging
6. Deploy fix to production

🤖 Generated with Claude Code