refactor(packages): extract model-core package

src/shared/model-normalization.ts

@@ -1,8 +1 @@
-export function normalizeModel(model?: string): string | undefined {
-	const trimmed = model?.trim()
-	return trimmed || undefined
-}
-
-export function normalizeModelID(modelID: string): string {
-	return modelID.replace(/\.(\d+)/g, "-$1")
-}
+export { normalizeModel, normalizeModelID } from "@oh-my-opencode/model-core"