fix: CodeRabbit auto-fixes for PR #5

[coderabbitai]

This stacked PR contains CodeRabbit auto-fixes for #5.

Files modified:

• open-sse/executors/github.js
• open-sse/providers/registry/hcnsec.js

Summary by CodeRabbit

• New Features

  • Improved routing for supported AI models, enabling compatible requests to use the appropriate endpoint.
  • Added a built-in catalog of commonly available models for offline fallback.

• Bug Fixes

  • Model availability is now preserved when live model discovery is unavailable.

[coderabbitai]

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