Drop the architecture-note product motivation, and describe AntV X6 as the shared canvas kernel for all visual diagram types rather than a choice made for architecture diagrams.
First-party canvases, including public share, parse diagram IR and draw
with read-only X6. Embedded Mermaid fences in ordinary notes stay on
Mermaid. Native viewers no longer inject a hidden Mermaid document when
the IR is valid.