This adds a generic, provider-agnostic executor for dynamically-loaded
partner nodes. The executor:
- Fetches node definitions from comfy-api's /object_info endpoint
- Creates ComfyNode classes dynamically from the schema
- Proxies execution to comfy-api with configurable input serialization
- Converts response bytes to appropriate output types (video/image/audio)
All provider-specific logic (API endpoints, model mappings, polling)
is handled server-side in comfy-api.
