refactor(packages): extract model-core package

src/shared/known-variants.ts

@@ -1,16 +1 @@
-/**
- * Canonical set of recognised variant / effort tokens.
- * Used by parseFallbackModelEntry (space-suffix detection) and
- * flattenToFallbackModelStrings (inline-variant stripping).
- */
-export const KNOWN_VARIANTS = new Set([
-  "low",
-  "medium",
-  "high",
-  "xhigh",
-  "max",
-  "minimal",
-  "none",
-  "auto",
-  "thinking",
-])
+export { KNOWN_VARIANTS } from "@oh-my-opencode/model-core"