Add Nerdsmiths skill transfer context to Terraria plan

docs/planning/terraria-branding-arc.md

@@ -13,6 +13,14 @@
 
 Terraria is Michael's **training ground for becoming Firefrost's brand designer**.
 
+**Critical Context:** Michael already has professional fabrication skills through The Nerdsmiths (crafting business with Meg). This training arc translates existing expertise from physical to digital:
+- **Cricut Maker 3** experience → GIMP workflow (same design principles, different output)
+- **Glowforge Aura** experience → Sprite layering and precision
+- **3D printing** experience → Spatial reasoning foundation
+
+See `docs/reference/skill-transfer.md` for complete skill transfer matrix. This isn't learning from zero—it's translation.
+
+
 **The Goal:** By Week 12, Michael can independently create visual assets for ANY Firefrost platform (Minecraft, Among Us, Discord, website, subscriber perks) using his existing Cricut/Glowforge skills translated to digital tools.
 
 **Why This Matters:** Every future expansion (Among Us events, new Minecraft modpacks, merchandise) needs consistent Fire vs Frost branding. Building this skill NOW unlocks years of creative self-sufficiency.