refactor(protocol): extract server contracts (#33708)

packages/core/src/reference.ts

@@ -1,6 +1,6 @@
 export * as Reference from "./reference"
 
-import { Context, Effect, Layer, Schema, Scope, Types } from "effect"
+import { Context, Effect, Layer, Scope, Types } from "effect"
 import { Reference } from "@opencode-ai/schema/reference"
 import { Global } from "./global"
 import { EventV2 } from "./event"
@@ -20,13 +20,8 @@ export type Source = Reference.Source
 
 export const Event = Reference.Event
 
-export class Info extends Schema.Class<Info>("Reference.Info")({
-  name: Schema.String,
-  path: AbsolutePath,
-  description: Schema.String.pipe(Schema.optional),
-  hidden: Schema.Boolean.pipe(Schema.optional),
-  source: Source,
-}) {}
+export const Info = Reference.Info
+export type Info = Reference.Info
 
 type Data = {
   sources: Map<string, Types.DeepMutable<Source>>