test(cli): add zx TDD infrastructure and phase 1 tests

- Install zx as devDependency for E2E testing
- Create tests/ directory with setup utilities
- Add setup.ts with test context helpers:
  - Random port generation (never 6767)
  - Temp directory creation for PASEO_HOME and workDir
  - Daemon startup/waitForDaemon helper (WebSocket only)
  - Cleanup function
  - paseo() helper to run CLI commands against test daemon
- Add Phase 1 foundation tests (01-foundation.test.mts):
  - Test paseo --version outputs version
  - Test paseo --help shows commands
- Add test runner (run-all.mts) that discovers and runs all tests
- Add test:e2e script to package.json

packages/cli/tests/01-foundation.test.mts

@@ -0,0 +1,53 @@
+#!/usr/bin/env npx zx
+
+/**
+ * Phase 1: Foundation Tests
+ *
+ * Tests basic CLI functionality that doesn't require a daemon:
+ * - paseo --version outputs version
+ * - paseo --help shows commands
+ */
+
+import { $ } from 'zx'
+
+$.verbose = false
+
+console.log('📋 Phase 1: Foundation Tests\n')
+
+// Test 1.1: --version outputs version
+console.log('  Testing paseo --version...')
+const versionResult = await $`paseo --version`.nothrow()
+if (versionResult.exitCode !== 0) {
+  console.error('  ❌ paseo --version failed with exit code', versionResult.exitCode)
+  console.error('     stderr:', versionResult.stderr)
+  process.exit(1)
+}
+const versionOutput = versionResult.stdout.trim()
+if (!versionOutput.match(/\d+\.\d+\.\d+/)) {
+  console.error('  ❌ paseo --version output does not contain version number')
+  console.error('     output:', versionOutput)
+  process.exit(1)
+}
+console.log('  ✅ paseo --version outputs:', versionOutput)
+
+// Test 1.2: --help shows commands
+console.log('  Testing paseo --help...')
+const helpResult = await $`paseo --help`.nothrow()
+if (helpResult.exitCode !== 0) {
+  console.error('  ❌ paseo --help failed with exit code', helpResult.exitCode)
+  console.error('     stderr:', helpResult.stderr)
+  process.exit(1)
+}
+const helpOutput = helpResult.stdout
+
+// Check for expected sections in help output
+const expectedTerms = ['agent', 'daemon', 'Usage', 'Options', 'Commands']
+const missingTerms = expectedTerms.filter(term => !helpOutput.includes(term))
+if (missingTerms.length > 0) {
+  console.error('  ❌ paseo --help missing expected terms:', missingTerms.join(', '))
+  console.error('     output:', helpOutput)
+  process.exit(1)
+}
+console.log('  ✅ paseo --help shows commands')
+
+console.log('\n✅ Phase 1: Foundation Tests PASSED')