Whether the active profile's SVG sprite is present in the DOM, so a
<use href="#…"> (a legend or taxonomy icon swatch) can resolve against its
<symbol> defs. Shared readiness signal: the selector lived, re-typed, at every
call site (legend-control, legend public-api) — now it lives here, next to the
code that stamps the attribute.
Whether the active profile's SVG sprite is present in the DOM, so a
<use href="#…">(a legend or taxonomy icon swatch) can resolve against its<symbol>defs. Shared readiness signal: the selector lived, re-typed, at every call site (legend-control, legend public-api) — now it lives here, next to the code that stamps the attribute.