test: add comprehensive UX test for 30-second quick start guide

📋 Change summary:
* Created test_ux_quick_start_guide.js with 8 comprehensive test scenarios
* Tests every step of the README quick start guide end-to-end
* Validates package installation, command deployment, configuration, subagents
* Includes integration test for complete 30-second flow (87ms execution)
* Added npm script test:ux-quick-start for easy execution
* All tests passing (100% success rate) - quick start guide is working correctly

Test coverage:
- Step 1: Claude Code prerequisite validation
- Step 2: NPM package structure and binary validation
- Step 3: Command deployment to ~/.claude/commands/
- Step 4: Configuration template application
- Step 5: Subagents installation (26 subagents)
- Step 6: Key command availability verification (/xtest, /xquality, /xsecurity, /xgit)
- Integration: Complete flow validation
- Validation: README accuracy against actual functionality

🤖 Generated with [Claude Code](https://claude.ai/code)

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

Author: PaulDuvall

claude-dev-toolkit/package.json

@@ -42,6 +42,7 @@
     "test:subagents": "node tests/test_subagents_command.js",
     "test:subagents-async": "node tests/test_subagents_async.js",
     "test:config": "node tests/test_config_command.js",
+    "test:ux-quick-start": "node tests/test_ux_quick_start_guide.js",
     "test:install": "scripts/publishing/test-package-install.sh",
     "test:manual": "scripts/publishing/manual-test-suite.sh",
     "publish:local": "scripts/publishing/setup-local-registry.sh",