Steps 2-4 of alloc_image (extent create, target find/create, targetextent
create) are now wrapped in an eval. On any failure the rollback runs in
reverse order, best-effort: target removed if it has no remaining extents
(i.e. it was just created for this disk), extent deleted with force=true,
zvol deleted recursively. This prevents the orphaned-resources-on-failure
state that previously required manual cleanup.
Also restore alias ("Proxmox VM <vmid>") on target creation. The alias was
removed during SCALE 25.04 debugging as a red herring — the actual bug was
int() type coercion (#264). Alias is unique per-VM and _resolve_vm_target
always checks for an existing target by name before attempting a POST, so
there is no alias-collision risk in normal operation.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
eab964c5a2