fix(routing): add agy to executor map so it uses AntigravityExecutor

The agy provider was registered in providerRegistry.ts with
executor: "antigravity" but the executor map in executors/index.ts
only had an "antigravity" entry. getExecutor("agy") fell through to
DefaultExecutor, which returned undefined for baseUrl (agy only has
baseUrls), causing fetch(undefined) → TypeError: Cannot read properties
of undefined (reading 'toString').

Closes diegosouzapw/OmniRoute#2932

open-sse/executors/index.ts

@@ -48,6 +48,7 @@ import { DoubaoWebExecutor } from "./doubao-web.ts";
 
 const executors = {
   antigravity: new AntigravityExecutor(),
+  agy: new AntigravityExecutor(),
   "gemini-cli": new GeminiCLIExecutor(),
   github: new GithubExecutor(),
   qoder: new QoderExecutor(),

tests/unit/executor-agy.test.ts

@@ -0,0 +1,39 @@
+import test from "node:test";
+import assert from "node:assert/strict";
+
+import { getExecutor, AntigravityExecutor } from "../../open-sse/executors/index.ts";
+
+test("getExecutor('agy') returns AntigravityExecutor (not DefaultExecutor)", () => {
+  const executor = getExecutor("agy");
+  assert.ok(executor instanceof AntigravityExecutor, "agy provider should use AntigravityExecutor");
+});
+
+test("getExecutor('antigravity') returns AntigravityExecutor", () => {
+  const executor = getExecutor("antigravity");
+  assert.ok(executor instanceof AntigravityExecutor, "antigravity provider should use AntigravityExecutor");
+});
+
+test("getExecutor('agy') builds valid streaming URL", () => {
+  const executor = getExecutor("agy");
+  const url = executor.buildUrl("gemini-3-flash", true);
+  assert.ok(
+    url.includes("streamGenerateContent?alt=sse"),
+    `expected streaming endpoint URL, got: ${url}`
+  );
+});
+
+test("getExecutor('agy') builds valid non-streaming URL", () => {
+  const executor = getExecutor("agy");
+  const url = executor.buildUrl("gemini-3-flash", false);
+  // Antigravity executor always uses streaming endpoint (buildUrl ignores stream flag)
+  assert.ok(
+    url.includes("streamGenerateContent?alt=sse"),
+    `expected streaming endpoint URL (always), got: ${url}`
+  );
+});
+
+test("getExecutor('agy') buildHeaders returns Bearer auth", () => {
+  const executor = getExecutor("agy");
+  const headers = executor.buildHeaders({ accessToken: "test-token" });
+  assert.equal(headers.Authorization, "Bearer test-token");
+});