feat(cli): add npm publish workflow and CLI tests

Add .github/workflows/publish-cli.yml for publishing the CLI to npm on
release or via manual workflow_dispatch with dry-run support.

Add comprehensive test coverage for the CLI:
- input-mapper.test.ts: 16 tests covering argument mapping, boolean
  conversion, yargs internal property filtering, and Cli.options population
- commands.test.ts: 26 tests verifying command exports, builder flags,
  default values, and camelCase aliases for all six commands
- cli-integration.test.ts: 8 integration tests spawning the CLI process
  to verify help output, version info, and error handling

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

src/cli/__tests__/cli-integration.test.ts

@@ -0,0 +1,100 @@
+import { execFile } from 'node:child_process';
+import path from 'node:path';
+
+/**
+ * Integration tests that spawn the CLI as a child process and verify
+ * exit codes and output. Uses node with --require ts-node/register to
+ * run the TypeScript entry point directly so no build step is required.
+ */
+
+const CLI_ENTRY = path.resolve(__dirname, '..', '..', 'cli.ts');
+
+function runCli(cliArguments: string[]): Promise<{ code: number | null; stdout: string; stderr: string }> {
+  return new Promise((resolve) => {
+    execFile(
+      process.execPath,
+      ['--require', 'ts-node/register/transpile-only', CLI_ENTRY, ...cliArguments],
+      { timeout: 30_000, cwd: path.resolve(__dirname, '..', '..', '..') },
+      (error, stdout, stderr) => {
+        resolve({
+          code: error ? error.code ?? 1 : 0,
+          stdout: stdout.toString(),
+          stderr: stderr.toString(),
+        });
+      },
+    );
+  });
+}
+
+// Integration tests spawn child processes which need more time than the default 5s
+jest.setTimeout(30_000);
+
+describe('CLI integration', () => {
+  it('exits 0 and shows all commands for --help', async () => {
+    const result = await runCli(['--help']);
+
+    expect(result.code).toStrictEqual(0);
+    expect(result.stdout).toContain('game-ci');
+    expect(result.stdout).toContain('build');
+    expect(result.stdout).toContain('activate');
+    expect(result.stdout).toContain('orchestrate');
+    expect(result.stdout).toContain('cache');
+    expect(result.stdout).toContain('status');
+    expect(result.stdout).toContain('version');
+  });
+
+  it('exits 0 and shows version info for version command', async () => {
+    const result = await runCli(['version']);
+
+    expect(result.code).toStrictEqual(0);
+    expect(result.stdout).toContain('unity-builder');
+  });
+
+  it('exits 0 and shows build flags for build --help', async () => {
+    const result = await runCli(['build', '--help']);
+
+    expect(result.code).toStrictEqual(0);
+    expect(result.stdout).toContain('--target-platform');
+    expect(result.stdout).toContain('--unity-version');
+    expect(result.stdout).toContain('--project-path');
+    expect(result.stdout).toContain('--build-name');
+    expect(result.stdout).toContain('--builds-path');
+    expect(result.stdout).toContain('--build-method');
+    expect(result.stdout).toContain('--custom-parameters');
+    expect(result.stdout).toContain('--provider-strategy');
+  });
+
+  it('exits non-zero for an unknown command', async () => {
+    const result = await runCli(['nonexistent']);
+
+    expect(result.code).not.toStrictEqual(0);
+  });
+
+  it('exits non-zero when no command is provided', async () => {
+    const result = await runCli([]);
+
+    expect(result.code).not.toStrictEqual(0);
+  });
+
+  it('exits 0 for orchestrate --help', async () => {
+    const result = await runCli(['orchestrate', '--help']);
+
+    expect(result.code).toStrictEqual(0);
+    expect(result.stdout).toContain('--target-platform');
+    expect(result.stdout).toContain('--provider-strategy');
+  });
+
+  it('exits 0 for activate --help', async () => {
+    const result = await runCli(['activate', '--help']);
+
+    expect(result.code).toStrictEqual(0);
+    expect(result.stdout).toContain('activate');
+  });
+
+  it('exits 0 for cache --help', async () => {
+    const result = await runCli(['cache', '--help']);
+
+    expect(result.code).toStrictEqual(0);
+    expect(result.stdout).toContain('cache');
+  });
+});