- Add tests/test_session_static_assets.py (5 tests):
* /session/static/style.css must return text/css (not text/html)
* /session/static/ui.js must return application/javascript
* /session/<id> still serves the HTML index (catch-all not weakened)
* Path-traversal still sandboxed after prefix strip
* /session/static/* matches /static/* auth-exemption policy
- Drop unused 'from urllib.parse import urlparse as _up' import from
PR #1505's added block (parsed._replace already gives a usable result).
Co-authored-by: Rick Chew <rickchew@users.noreply.github.com>