refactor(schema): export Identifier namespace and drop core re-export (#52644)

packages/core/src/util/identifier.ts

@@ -1 +0,0 @@
-export * as Identifier from "@opencode/schema/identifier"

packages/enterprise/test/core/share.test.ts

@@ -1,7 +1,7 @@
 import { describe, expect, test } from "bun:test"
 import { Share } from "../../src/core/share"
 import { Storage } from "../../src/core/storage"
-import { Identifier } from "@opencode/core/util/identifier"
+import { Identifier } from "@opencode/schema/identifier"
 
 describe.concurrent("core.share", () => {
   test("should create a share", async () => {

packages/schema/src/identifier.ts

@@ -1,3 +1,5 @@
+export * as Identifier from "./identifier.js"
+
 const length = 26
 const chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
 let lastTimestamp = 0