First-run setup that captures a creator's foundation — niche, positioning, offer, platforms, and voice — into a reusable BRAND BRIEF block the other SocialForge skills read from. Includes a voice-training step that extracts tone, lexicon, and rhythm from the creator's own posts (or admired creators) so generated content sounds like a person, not a model. Use when the user first opens SocialForge, or says "set up my brand", "set up my profile", "train my voice", or is onboarding. Trigger on any first-run or profile-setup intent. Works with any capable model.
