C ABI note

PixelFlow commits a generated ABI header at:

crates/pixelflow-plugin-sdk/include/pixelflow_plugin.h

This header exists for ABI review and compatibility checks.

Direct C or C++ plugin authoring is unsupported in current Phase 1 workflow. Use the Rust SDK instead.

What header is for

Use header when reviewing ABI layout, exported symbol shape, and compatibility drift across host and plugin changes.

What header is not for

Do not treat header as supported direct authoring workflow for production PixelFlow plugins today.

Rust SDK remains only documented authoring path in this book.