fix(server): return diagnosable body for schema rejections (#26631)

packages/opencode/src/server/routes/instance/httpapi/server.ts

@@ -84,6 +84,7 @@ import { compressionLayer } from "./middleware/compression"
 import { corsVaryFix } from "./middleware/cors-vary"
 import { errorLayer } from "./middleware/error"
 import { fenceLayer } from "./middleware/fence"
+import { schemaErrorLayer } from "./middleware/schema-error"
 
 export const context = Context.makeUnsafe<unknown>(new Map())
 
@@ -114,6 +115,7 @@ const authOnlyRouterLayer = authorizationRouterMiddleware.layer.pipe(Layer.provi
 const httpApiAuthLayer = authorizationLayer.pipe(Layer.provide(ServerAuth.Config.defaultLayer))
 const rootApiRoutes = HttpApiBuilder.layer(RootHttpApi).pipe(
   Layer.provide([controlHandlers, globalHandlers]),
+  Layer.provide(schemaErrorLayer),
   Layer.provide(httpApiAuthLayer),
 )
 const instanceRouterLayer = authorizationRouterMiddleware
@@ -150,6 +152,7 @@ const instanceRoutes = Layer.mergeAll(rawInstanceRoutes, instanceApiRoutes).pipe
     httpApiAuthLayer,
     workspaceRoutingLayer.pipe(Layer.provide(Socket.layerWebSocketConstructorGlobal)),
     instanceContextLayer,
+    schemaErrorLayer,
   ]),
 )