Scopes the Antigravity 404 model-not-found lockout to the exact model (not the whole
family) so one missing bare model no longer hijacks the family cooldown, plus bare-model
autopick via resolveModelByProviderInference dedup. The thinking-signature-recovery portion
was dropped — #7899 is already fixed and merged on the release via #7906.
Co-authored-by: AndrianBalanescu <AndrianBalanescu@users.noreply.github.com>
Co-authored-by: diegosouzapw <8016841+diegosouzapw@users.noreply.github.com>
