Function render_site_json 

pub fn render_site_json(grammar_json: &str) -> String

Render the grammar as the JSON document the documentation site consumes. The {{#grammar}} remark directive looks each rule up in productions (the same <name> ::= <rhs> line render_production embeds, over embeddable_rules), and the full-grammar page reads appendix (render_appendix). Because both come from the same renderer as the mdBook preprocessor, the site cannot drift from the book. Object keys preserve grammar order (serde_json preserve_order).

The committed artifact (site/src/generated/grammar.json) is drift-guarded by bynk-grammar/tests/generated_grammar_json.rs; regenerate with BYNK_BLESS=1.