Migrate CLI E2E tests to Node.js 26

Run the CLI subprocess suites and benchmark tools as native TypeScript with
node:test, and move them under test/e2e-cli.

Update CI and Compose runners, run local smoke tests on Linux, macOS, and
Windows, and collect source-mapped CLI coverage with c8.

test/e2e-cli/helpers/paths.ts

@@ -0,0 +1,5 @@
+import { join, resolve } from "node:path";
+
+export const REPOSITORY_ROOT = resolve(import.meta.dirname, "../../..");
+export const CLI_DIR = join(REPOSITORY_ROOT, "src", "apps", "cli");
+export const CLI_DIST = join(CLI_DIR, "dist", "index.cjs");