fix: lazy session error schema

Author: Hona

packages/opencode/src/session/session.ts

@@ -284,7 +284,8 @@ export const Event = {
       sessionID: Schema.optional(SessionID),
       // Reuses MessageV2.Assistant.fields.error (already Schema.optional) so
       // the derived zod keeps the same discriminated-union shape on the bus.
-      error: MessageV2.Assistant.fields.error,
+      // Schema.suspend defers access to break circular init in compiled binaries.
+      error: Schema.suspend(() => MessageV2.Assistant.fields.error),
     }),
   ),
 }

packages/opencode/src/util/effect-zod.ts

@@ -256,6 +256,8 @@ function body(ast: SchemaAST.AST): z.ZodTypeAny {
       return array(ast)
     case "Declaration":
       return decl(ast)
+    case "Suspend":
+      return z.lazy(() => walk(ast.thunk()))
     default:
       return fail(ast)
   }