refactor: remove dead code

🤖 GENERATED WITH ASSISTANCE OF [OhMyOpenCode](https://github.com/code-yeongyu/oh-my-opencode)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/plugin-state.ts

@@ -9,22 +9,3 @@ export function createModelCacheState(): ModelCacheState {
     anthropicContext1MEnabled: false,
   };
 }
-
-export function getModelLimit(
-  state: ModelCacheState,
-  providerID: string,
-  modelID: string
-): number | undefined {
-  const key = `${providerID}/${modelID}`;
-  const cached = state.modelContextLimitsCache.get(key);
-  if (cached) return cached;
-
-  if (
-    providerID === "anthropic" &&
-    state.anthropicContext1MEnabled &&
-    modelID.includes("sonnet")
-  ) {
-    return 1_000_000;
-  }
-  return undefined;
-}