* test(e2e): phase-2 add office and zip smoke coverage
* test(e2e): address copilot review for fixture stability and CI python setup
* test(e2e): fix preflight fixture scope and path handling
* test(e2e): harden fixture preflight and remove duplicate generation
* test(e2e): remove redundant zip install and cleanup temp zip dir
* test(e2e): ensure zip dependency and unify python command in docs
* docs(e2e): align README with npm gen scripts and python3 usage
