X_COVERAGE_FLOOR_STALE
Means
the app now covers more than the floor in x.verify.json states
Typical cause
A floor under 95 is more than 1.5 points below what the unit suite measures. The floor only rises: left alone it would let the next regression fall back to a number the app left behind
Fix
x verify --only unit --json — the finding carries the measured numbers; raise "coverage" in x.verify.json to them