Push Reachability Summary

How much of the push audience can still receive a push.

Three numbers rather than one percentage, because a bare rate hides the two things that make it honest. cohort is the ACTIVELY-pushed audience (see app/jobs/push_reachability_sweep.py for why it cannot be the whole base), and checked is how many of them we have actually read - so the UI can say "based on N of M" instead of implying it measured everyone. reachable_pct is None when nothing has been read, so "not reporting" can never render as a confident 0%.