Campo tracking.facebookPixelId no global SiteSettings (mesma validação/normalização do precedente Petition, regra centralizada em facebookPixel.ts); home (grupo (home)) injeta o base code + PageView quando o ID está configurado (fail-closed) e o CampaignNewsletterForm dispara exatamente um Lead no sucesso do S9. Migration 20260819_213947_add_site_settings_facebook_pixel_id. Closes#94
Let marketing configure a numeric facebookPixelId per petition in Payload, fire PageView on load and Lead after a successful signature, and mark the roadmap item delivered with deferred follow-ups documented.