docs: remove SDK-First Mode section from README

Not ready for public docs yet.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: bradygaster

README.md

@@ -167,25 +167,6 @@ When agents finish, the coordinator immediately chains follow-up work. If you st
 
 **Commit this folder.** Your team persists. Names persist. Anyone who clones gets the team — with the same cast.
 
-### SDK-First Mode (New in Phase 1)
-
-Prefer TypeScript? You can define your team in code instead of markdown. Create a `squad.config.ts` with builder functions, run `squad build`, and the `.squad/` files are generated automatically.
-
-```typescript
-// squad.config.ts
-import { defineSquad, defineTeam, defineAgent } from '@bradygaster/squad-sdk';
-
-export default defineSquad({
-  team: defineTeam({ name: 'Platform Squad', members: ['@edie', '@mcmanus'] }),
-  agents: [
-    defineAgent({ name: 'edie', role: 'TypeScript Engineer', model: 'claude-sonnet-4' }),
-    defineAgent({ name: 'mcmanus', role: 'DevRel', model: 'claude-haiku-4.5' }),
-  ],
-});
-```
-
-Run `squad build` to generate all the markdown. See the [SDK-First Mode Guide](docs/sdk-first-mode.md) for full documentation.
-
 ---
 
 ## Monorepo Development