chore(cli-v2): un-ignore CLI source tree for binary release workflow

The CLI source (242 files, ~14k lines) was gitignored during the
earlier cli→cli-v2 reorg so only the published npm package carried it.
That blocks the GitHub Actions release workflow (release-cli.yml),
which clones the repo fresh on each runner and needs the source to
compile binaries via `bun build --compile`.

Moves the gitignore from root-level to `apps/cli-v2/.gitignore` with
only the usual build artefacts excluded (node_modules, dist, .turbo,
.cache). Source is now in git at apps/cli-v2/src/.

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

apps/cli-v2/tests/golden/version.test.ts

@@ -0,0 +1,12 @@
+import { describe, it, expect } from "vitest";
+import { execSync } from "node:child_process";
+import { resolve } from "node:path";
+
+const CLI = resolve(__dirname, "../../dist/entrypoints/cli.js");
+
+describe("golden: --version", () => {
+  it("outputs version string", () => {
+    const output = execSync(`node ${CLI} --version`, { encoding: "utf-8" }).trim();
+    expect(output).toMatch(/claudemesh v\d+\.\d+\.\d+/);
+  });
+});

apps/cli-v2/tests/golden/whoami.test.ts

@@ -0,0 +1,15 @@
+import { describe, it, expect } from "vitest";
+import { execSync } from "node:child_process";
+import { resolve } from "node:path";
+
+const CLI = resolve(__dirname, "../../dist/entrypoints/cli.js");
+
+describe("golden: whoami --json", () => {
+  it("outputs schema_version 1.0 when not signed in", () => {
+    const env = { ...process.env, CLAUDEMESH_CONFIG_DIR: "/tmp/claudemesh-golden-test-" + Date.now() };
+    const output = execSync(`node ${CLI} whoami --json`, { encoding: "utf-8", env }).trim();
+    const json = JSON.parse(output);
+    expect(json.schema_version).toBe("1.0");
+    expect(json.signed_in).toBe(false);
+  });
+});