The multi-volume enabler. allVolumes(reader, device_blocks, out) appends every
volume on the device to the caller's buffer and returns the count: GPT
enumerates all valid entries (gptFirstVolume becomes gptAllVolumes), the MBR walk
collects all fitting partitions, and a bare FAT is the single whole-device volume
— each with the same per-entry overflow-safe range validation (the confinement
invariant the driver's clamp rests on) and fatIdentity-over-disk-signature
preference. firstVolume is now the one-element case of allVolumes, so the S1
behavior and its ten tests are unchanged. New host test: a two-partition MBR
yields two volumes with distinct identities (index 0 vs 1); it FAILS when
allVolumes is capped to one (the old firstVolume semantics), passes at 11/11.
Daniel Samson
d4b544d66b