refactor(schema): isolate v1 contracts (#33769)

packages/schema/test/v1-isolation.test.ts

@@ -0,0 +1,28 @@
+import { expect, test } from "bun:test"
+import { LegacyEvent } from "../src/legacy-event"
+import { PermissionV1 } from "../src/permission-v1"
+import { QuestionV1 } from "../src/question-v1"
+import { SessionV1 } from "../src/session-v1"
+import { LegacyEvent as IsolatedLegacyEvent } from "../src/v1/legacy-event"
+import { PermissionV1 as IsolatedPermissionV1 } from "../src/v1/permission"
+import { QuestionV1 as IsolatedQuestionV1 } from "../src/v1/question"
+import { SessionV1 as IsolatedSessionV1 } from "../src/v1/session"
+
+test("compatibility entrypoints preserve isolated V1 schema identity", () => {
+  expect(LegacyEvent).toBe(IsolatedLegacyEvent)
+  expect(PermissionV1).toBe(IsolatedPermissionV1)
+  expect(QuestionV1).toBe(IsolatedQuestionV1)
+  expect(SessionV1).toBe(IsolatedSessionV1)
+})
+
+test("current source does not import the V1 subtree directly", async () => {
+  const allowed = new Set(["legacy-event.ts", "permission-v1.ts", "question-v1.ts", "session-v1.ts"])
+  const files = [...new Bun.Glob("*.ts").scanSync(new URL("../src", import.meta.url).pathname)].filter(
+    (file) => !allowed.has(file),
+  )
+  const directImports = await Promise.all(
+    files.map(async (file) => ({ file, source: await Bun.file(new URL(`../src/${file}`, import.meta.url)).text() })),
+  ).then((values) => values.filter((value) => value.source.includes('from "./v1/')))
+
+  expect(directImports).toEqual([])
+})