The critic fact-check (CRITIC-9 / CRITIC-5): the ROP Sunburst loaded d3@7 (a floating range, no
SRI) as window.d3, overwriting a host's own d3, or running on whatever d3 the host already had.
ensureD3() now loads d3@7.9.0 exactly with integrity + crossorigin, keeps it in the module
(pplrD3()) and puts the host's window.d3 back (or leaves none). SemanticSunburst reads pplrD3(),
and if a caller forgot to await ensureD3 it loads it and builds instead of asking for a refresh.
Headless proof: the stubbed-DOM loader test, 6/6 (host d3 restored, none leaked, exact version +
integrity + crossorigin, a failure rejects). BUNDLE=pplr-data-maps builds. Plugin-only.
needs eyes: PPLR > ROP Sunburst draws; on a host page with its own window.d3 it is untouched.
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