Function render_blocks 

pub fn render_blocks<H: RenderHooks + ?Sized>(
    hooks: &H,
    out: &mut String,
    blocks: &[Block],
)

Render a sequence of blocks to HTML. Used by render_document and by src-tauri’s render_hero_html_typed (Phase 4 PR4.5) to render a Vec<Block> that didn’t come from a full Document (e.g. a hero overlay).

Source-line caveat: this entry point has no per-block meta vec, so every block renders without data-source-line. Callers that need source-line annotations must walk meta-block pairs themselves (see render_document). Today only render_document consumes meta; nested-block walks (list items, callout bodies, blockquotes) are also meta-free — data-source-line is a top-level-block-only concern, matching the legacy transform_events emit shape.

H: ?Sized so the function can be called with &dyn RenderHooks or with self: &Self from inside a trait default method (where Self is not statically Sized). The hook surface is a thin dispatch boundary; monomorphization across all concrete impls is not required.