Round-1 consensus on #94: timeout only proves the CLIENT overran the
budget. incus launch is create-then-start, so a slow-but-progressing
launch may already have registered the instance — the old message claimed
'never created' unconditionally and the advised retry would collide with
'Instance already exists'. The 124/137 path now probes 'incus info',
narrates the branch it found (true #93 wedge vs slow-launch overrun),
best-effort 'incus delete --force's either way so the retry is clean in
both worlds, hedges 137 as possibly an outside kill, and BOX_LAUNCH_TIMEOUT
is documented in 'box help new' beside the other knobs. Both branches
driven live against a shim incus; four new grep-proof checks pin the probe,
the cleanup, the overrun story, and the help text.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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