refactor(protocol): extract server contracts (#33708)

packages/protocol/test/session-cursor.test.ts

@@ -0,0 +1,18 @@
+import { describe, expect, test } from "bun:test"
+import { Effect } from "effect"
+import { SessionsCursor } from "../src/groups/session"
+import { Session } from "@opencode-ai/schema/session"
+
+describe("SessionsCursor", () => {
+  test("round trips without Node globals", async () => {
+    const input = {
+      workspace: undefined,
+      search: "protocol",
+      order: "desc" as const,
+      anchor: { id: Session.ID.make("ses_test"), time: 1, direction: "next" as const },
+    }
+    const cursor = SessionsCursor.make(input)
+
+    expect(await Effect.runPromise(SessionsCursor.parse(cursor))).toEqual(input)
+  })
+})