$ docker-agent sessions diff -1 -2
Error: unknown shorthand flag: '1' in -1
[exit 1]

$ docker-agent sessions diff -- -1 -2
Comparing -1 (5 turns) against -2 (5 turns)

✅ Identical behaviour across all 5 turns.
[exit 0]

$ docker-agent sessions diff --fail-on-divergence -- -1 -3
Comparing -1 (5 turns) against -3 (6 turns)

❌ First divergence at turn 0 (after 0 matching turn(s)).
   -1 called:
     list_directory({"path": "."})
   -3 called:
     shell({"cmd": "echo m101-ok"})

Everything after this point is downstream of the divergence and is not compared.
Error: sessions diverged
[exit 1]