With the main window shown at did-finish-load, J1 takes one path on the
runner: three dispatched runs (36928706097, 36928716010, 36928725392)
read 15 bridge calls and 559 DOM mutations in all 18 iterations,
stable: true. Both become baselines (slack 0), and the Performance
journeys job checks them with check-journey-ratchet.mjs --only.
The journeys document records the race, its cause, the before/after
wall-clock and which other J1 counters are now stable.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>