2 plans (2 waves): Wave 0 xfail stubs for test_auth_fgp.py (4 FGP tests), Wave 1 production implementation (_compute_fgp helper, create_access_token fgp claim, get_current_user fgp validation, login/refresh call-site updates, test promotion) + version bump to 0.1.3. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>