test(deps): prevent bundled pi core runtimes

tests/test-package-manifest.ts

@@ -0,0 +1,28 @@
+import assert from "node:assert/strict"
+import { readFile } from "node:fs/promises"
+import { describe, it } from "node:test"
+
+interface PackageManifest {
+  dependencies?: Record<string, string>
+  peerDependencies?: Record<string, string>
+  peerDependenciesMeta?: Record<string, { optional?: boolean }>
+}
+
+const CORE_PEERS = ["@earendil-works/pi-ai", "@earendil-works/pi-coding-agent"] as const
+
+async function readPackageManifest(): Promise<PackageManifest> {
+  const contents = await readFile(new URL("../package.json", import.meta.url), "utf-8")
+  return JSON.parse(contents) as PackageManifest
+}
+
+describe("package manifest", () => {
+  it("uses pi's bundled core packages instead of installing private runtime copies", async () => {
+    const manifest = await readPackageManifest()
+
+    for (const packageName of CORE_PEERS) {
+      assert.equal(manifest.dependencies?.[packageName], undefined)
+      assert.equal(manifest.peerDependencies?.[packageName], "*")
+      assert.equal(manifest.peerDependenciesMeta?.[packageName]?.optional, true)
+    }
+  })
+})