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

packages/server/src/middleware/schema-error.ts

@@ -1,6 +1,8 @@
 import { Effect } from "effect"
 import { HttpApiMiddleware } from "effect/unstable/httpapi"
-import { InvalidRequestError } from "../errors"
+import { InvalidRequestError } from "@opencode-ai/protocol/errors"
+import { SchemaErrorMiddleware } from "@opencode-ai/protocol/middleware/schema-error"
+export { SchemaErrorMiddleware } from "@opencode-ai/protocol/middleware/schema-error"
 
 const REASON_LIMIT = 1024
 
@@ -9,11 +11,6 @@ function truncateReason(reason: string) {
   return reason.slice(0, REASON_LIMIT) + `... (${reason.length - REASON_LIMIT} more chars)`
 }
 
-export class SchemaErrorMiddleware extends HttpApiMiddleware.Service<SchemaErrorMiddleware>()(
-  "@opencode/HttpApiSchemaError",
-  { error: InvalidRequestError },
-) {}
-
 export const schemaErrorLayer = HttpApiMiddleware.layerSchemaErrorTransform(SchemaErrorMiddleware, (error) => {
   const reason = truncateReason(error.cause.message)
   return Effect.logWarning("schema rejection").pipe(