Function render_project_failure 

pub fn render_project_failure(failure: &ProjectFailure)

Render a project build failure with per-file ariadne context, exactly as single-file mode had rich rendering. Unattributed (project-level) errors keep the plain form.

This is the flattening layer (ADR 0100): it attributes each AttributedError to its file snapshot and delegates the actual rendering to bynk_render::print_errors. The ProjectFailure → CompileError flattening stays here, above bynk-render, so there is no render → emit edge.