test: split fast lane from channel and gateway suites

vitest.channels.config.ts

@@ -0,0 +1,20 @@
+import { defineConfig } from "vitest/config";
+import baseConfig from "./vitest.config.ts";
+
+const base = baseConfig as unknown as Record<string, unknown>;
+const baseTest = (baseConfig as { test?: { exclude?: string[] } }).test ?? {};
+
+export default defineConfig({
+  ...base,
+  test: {
+    ...baseTest,
+    include: [
+      "src/telegram/**/*.test.ts",
+      "src/discord/**/*.test.ts",
+      "src/web/**/*.test.ts",
+      "src/browser/**/*.test.ts",
+      "src/line/**/*.test.ts",
+    ],
+    exclude: [...(baseTest.exclude ?? []), "src/gateway/**", "extensions/**"],
+  },
+});