The 4-step html-embed gate (feature-enabled AND role-allowed -> stripHtmlEmbedNodes)
was replicated across call-sites, pinned only by brittle source-regex tests. Add
stripHtmlEmbedIfNotAllowed(json, {featureEnabled, role, onStrip}) and migrate the
5 plain strip-all sites (collab handler, page create+duplicate, both import paths,
transclusion) to it, each keeping its own feature/role resolve + log via onStrip.
Left the 2 sites with different semantics: persistence.extension (#29 preserve-
admin) and share.service (feature-only kill-switch, no role gate). Real unit tests
replace the regex pins; behavior identical.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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