Add CLI integration smoke tests (#129)

* Add CLI integration smoke tests (#79)

Test that each CLI command starts and is wired up correctly by invoking
the actual CLI via child_process exec.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Add integration tests for CLI commands end-to-end

Smoke tests verifying each CLI command starts and is wired up:
--version, --help, run --help, apply --help, config list, clean.
6 new integration tests using child_process exec.

Closes #79

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: unknown <that-github-user@github.com>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: 3 people

src/integration.test.ts

@@ -0,0 +1,49 @@
+import assert from "node:assert/strict";
+import { exec as execCb } from "node:child_process";
+import { describe, it } from "node:test";
+import { promisify } from "node:util";
+
+const exec = promisify(execCb);
+const CLI = "npx tsx src/cli.ts";
+
+describe("CLI integration (smoke tests)", () => {
+  it("--version outputs version number", async () => {
+    const { stdout } = await exec(`${CLI} --version`);
+    assert.match(stdout.trim(), /^\d+\.\d+\.\d+$/);
+  });
+
+  it("--help shows all commands", async () => {
+    const { stdout } = await exec(`${CLI} --help`);
+    assert.ok(stdout.includes("Ensemble AI coding"));
+    assert.ok(stdout.includes("run"));
+    assert.ok(stdout.includes("apply"));
+    assert.ok(stdout.includes("list"));
+    assert.ok(stdout.includes("stats"));
+    assert.ok(stdout.includes("clean"));
+    assert.ok(stdout.includes("undo"));
+    assert.ok(stdout.includes("config"));
+  });
+
+  it("run --help shows options", async () => {
+    const { stdout } = await exec(`${CLI} run --help`);
+    assert.ok(stdout.includes("--attempts"));
+    assert.ok(stdout.includes("--model"));
+    assert.ok(stdout.includes("--scoring"));
+  });
+
+  it("apply --help shows options", async () => {
+    const { stdout } = await exec(`${CLI} apply --help`);
+    assert.ok(stdout.includes("--agent"));
+    assert.ok(stdout.includes("--preview"));
+    assert.ok(stdout.includes("--dry-run"));
+  });
+
+  it("config list runs without error", async () => {
+    const { stdout } = await exec(`${CLI} config list`);
+    assert.ok(stdout.includes("attempts") || stdout.includes("model"));
+  });
+
+  it("clean runs without error", async () => {
+    await exec(`${CLI} clean`);
+  });
+});