core: make account login upgrades safe while adding multi-account workspace auth (#15487)

Co-authored-by: Kit Langton <kit.langton@gmail.com>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

packages/opencode/src/util/schema.ts

@@ -0,0 +1,17 @@
+import { Schema } from "effect"
+
+/**
+ * Attach static methods to a schema object. Designed to be used with `.pipe()`:
+ *
+ * @example
+ *   export const Foo = fooSchema.pipe(
+ *     withStatics((schema) => ({
+ *       zero: schema.makeUnsafe(0),
+ *       from: Schema.decodeUnknownOption(schema),
+ *     }))
+ *   )
+ */
+export const withStatics =
+  <S extends object, M extends Record<string, unknown>>(methods: (schema: S) => M) =>
+  (schema: S): S & M =>
+    Object.assign(schema, methods(schema))