Why does default coordinate completion fail?
The stored coordinate now targets delete instead of release.
Can matching versions replace current permission?
No. Permission is independently required.
What does observation age 3 do under max_age = 2?
All three methods refuse issuance until renewed observation.
With change_rate 0.02 per second, compute the no-invalidating-change probability for delays of 5, 15 and 30 seconds.
exp(-0.02*5)=0.9048, exp(-0.02*15)=0.7408, exp(-0.02*30)=0.5488, matching the freshness_by_delay field.