Fix loading when installed from git: import openAIResponsesApi from pi-ai/compat

pi resolves only a fixed set of its own module paths for installed
extensions; pi-ai/api/* is not among them. Add a test that keeps
runtime imports within that set.

src/provider.ts

@@ -3,7 +3,9 @@ import {
   type Model,
   type Provider,
 } from "@earendil-works/pi-ai";
-import { openAIResponsesApi } from "@earendil-works/pi-ai/api/openai-responses.lazy";
+// pi resolves only a fixed set of its own module paths for extensions; anything
+// else (e.g. pi-ai/api/*) fails in a git/npm install. See test/imports.test.ts.
+import { openAIResponsesApi } from "@earendil-works/pi-ai/compat";
 import { getBuiltinModels } from "@earendil-works/pi-ai/providers/all";
 
 export const PROVIDER_ID = "unigpt";

test/imports.test.ts

@@ -0,0 +1,31 @@
+import assert from "node:assert/strict";
+import { readdirSync, readFileSync } from "node:fs";
+import { test } from "node:test";
+
+// Installed packages get no copy of pi in node_modules (pi is a peer
+// dependency). pi maps only these specifiers to its own modules when loading
+// an extension; see "Available Imports" in pi's docs/extensions.md.
+const HOST_PROVIDED = new Set([
+  "@earendil-works/pi-coding-agent",
+  "@earendil-works/pi-agent-core",
+  "@earendil-works/pi-tui",
+  "@earendil-works/pi-ai",
+  "@earendil-works/pi-ai/compat",
+  "@earendil-works/pi-ai/models",
+  "@earendil-works/pi-ai/oauth",
+  "@earendil-works/pi-ai/providers/all",
+  "typebox",
+  "typebox/compile",
+  "typebox/value",
+]);
+
+test("runtime source imports only modules that pi provides to extensions", () => {
+  const sourceDir = new URL("../src/", import.meta.url);
+  for (const file of readdirSync(sourceDir).filter((name) => name.endsWith(".ts"))) {
+    const source = readFileSync(new URL(file, sourceDir), "utf8");
+    for (const [, specifier] of source.matchAll(/^\s*import\s[^;]*?from\s+"([^"]+)"/gms)) {
+      if (specifier.startsWith(".") || specifier.startsWith("node:")) continue;
+      assert.ok(HOST_PROVIDED.has(specifier), `src/${file} imports "${specifier}", which pi does not provide to installed extensions`);
+    }
+  }
+});