feat(config): add team-mode configuration schema and merge support

src/config/schema.ts

@@ -18,6 +18,7 @@ export * from "./schema/notification"
 export * from "./schema/oh-my-opencode-config"
 export * from "./schema/ralph-loop"
 export * from "./schema/runtime-fallback"
+export * from "./schema/team-mode"
 export * from "./schema/skills"
 export * from "./schema/sisyphus"
 export * from "./schema/sisyphus-agent"