One upgrade, start to finish

journal.jsonl

1staged

2handing-over priorStartId=a1

3running-experiment

4readback 2.0.0 pid 4311 b7

5promote ← point of no return

6promoted

slots/stable

1.0.0

trusted bytes

slots/experiment

empty

application process

1.0.0

pid 4242
startId a1

running

probe → version, pid, startId

operation.json: promoted · exit 0