feat(core): generate Anthropic thinking variants for reasoning models

packages/core/src/plugin/models-dev.ts

@@ -108,6 +108,7 @@ export const ModelsDevPlugin = define({
                   }
               draft.capabilities = {
                 tools: model.tool_call,
+                reasoning: model.reasoning,
                 input: [...(model.modalities?.input ?? [])],
                 output: [...(model.modalities?.output ?? [])],
               }