v0.14.0

• refactor(openapi): extract _ensure_default_response helper and add unit tests
• test: add snapshot regression tests
• fix: improve openapi spec generation and logging
• fix: enhance CLI error handling
• fix: improve decorator imports and deepcopy usage
• fix: enhance utils validation and error handling
• feat: separate exceptions into dedicated module
• docs: add CLI quick-start to README, improve Troubleshooting, add Pydantic v2 edge case tests
• fix: implement --pretty flag, extract _build_spec helper, sync docs
• fix: use stable action tags in label-sync workflow
• feat: add --app module import option and empty-paths guard to CLI
• docs: add codex agent guidance