feat(core): add public native API (#30828)

packages/core/test/public-opencode.test.ts

@@ -0,0 +1,29 @@
+import { describe, expect } from "bun:test"
+import { Effect } from "effect"
+import { OpenCode, Session } from "@opencode-ai/core/public"
+import { testEffect } from "./lib/effect"
+
+const it = testEffect(OpenCode.layer)
+
+describe("public native OpenCode API", () => {
+  it.effect("exposes only the intentional Session capabilities", () =>
+    Effect.gen(function* () {
+      const opencode = yield* OpenCode.Service
+
+      expect(Object.keys(opencode.sessions).sort()).toEqual([
+        "context",
+        "create",
+        "events",
+        "get",
+        "list",
+        "message",
+        "messages",
+        "prompt",
+      ])
+      expect(Session.ID.create()).toStartWith("ses_")
+      expect(Session.MessageID.create()).toStartWith("msg_")
+      expect(yield* opencode.sessions.list()).toBeArray()
+    }),
+  )
+
+})