refactor(schema): apply session review decisions (#35793)

packages/schema/src/token-usage.ts

@@ -0,0 +1,14 @@
+export * as TokenUsage from "./token-usage.js"
+
+import { Schema } from "effect"
+
+export interface Info extends Schema.Schema.Type<typeof Info> {}
+export const Info = Schema.Struct({
+  input: Schema.Finite,
+  output: Schema.Finite,
+  reasoning: Schema.Finite,
+  cache: Schema.Struct({
+    read: Schema.Finite,
+    write: Schema.Finite,
+  }),
+}).annotate({ identifier: "TokenUsage.Info" })