illume: a portable text lexer and syntax highlighter for the Mere browser.
The editor pipe, host-agnostic and toolkit-free. It reads .knot source text
and produces the (range, kind) highlight channel the edit surface paints,
plus the inner-language injection registry. This is the editor pipe in the
plan's two-parser split: it colors and (later) navigates the source. It is
separate from the meaning pipe (nematic's DjotKnotEngine: text →
DocumentBlock), and both read the same bytes. The source text is always the
single source of truth; nothing here mutates it.
Pure Rust and wasm-clean by construction (jotdown plus, later, logos inner
lexers), so native and the browser build the same way. See
design_docs/mere_docs/implementation_strategy/2026-06-24_djot_editor_knot_nodes_plan.md.