Convert the dossier personal excerpt from a plain textarea to Lexical
rich text (matching the intel excerpt) with a 1000-character plain-text
limit, and replace the static read-only cards on the profile page with
inline DossierExcerptEditors: owners edit their personal excerpt,
profiles:intel_excerpt:update holders edit the intelligence record.
Changes are validated server-side (lexicalPlaintextLength) and emit
dossier:personal-excerpt-update / dossier:intel-excerpt-update events.
