ic-engine v2.4.5 — SVG ID collision fix. Inline-time id prefixing in _load_avatar_image() eliminates the url(#bg)/url(#avatarClip) collisions that broke the lead/foil pair when two avatars rendered side-by-side in one HTML document. No source-SVG rewrite needed; prefix derived from persona slug. Resolves codex P2 deferral from v2.4.4.