fix(acp): strip provider auth env for child ACP processes (openclaw#42250)

Verified:
- pnpm build
- pnpm check
- pnpm test:macmini

Co-authored-by: rodrigouroz <384037+rodrigouroz@users.noreply.github.com>
Co-authored-by: Tak Hoffman <781889+Takhoffman@users.noreply.github.com>

src/plugin-sdk/subpaths.test.ts

@@ -98,6 +98,12 @@ describe("plugin-sdk subpath exports", () => {
     expect(typeof msteamsSdk.loadOutboundMediaFromUrl).toBe("function");
   });
 
+  it("exports acpx helpers", async () => {
+    const acpxSdk = await import("openclaw/plugin-sdk/acpx");
+    expect(typeof acpxSdk.listKnownProviderAuthEnvVarNames).toBe("function");
+    expect(typeof acpxSdk.omitEnvKeysCaseInsensitive).toBe("function");
+  });
+
   it("resolves bundled extension subpaths", async () => {
     for (const { id, load } of bundledExtensionSubpathLoaders) {
       const mod = await load();