* feat(shell): add volume.tier.compact command to reclaim cloud storage space
Adds a new shell command that automates compaction of cloud tier volumes.
When files are deleted from remote-tiered volumes, space is not reclaimed
on the cloud storage. This command orchestrates: download from remote,
compact locally, and re-upload to reclaim deleted space.
Closes#8563
* fix: log cleanup errors in compactVolumeOnServer instead of discarding them
Helps operators diagnose leftover temp files (.cpd/.cpx) if cleanup
fails after a compaction or commit failure.
* fix: return aggregate error from loop and use regex for collection filter
- Track and return error count when one or more volumes fail to compact,
so callers see partial failures instead of always getting nil.
- Use compileCollectionPattern for -collection in -volumeId mode too, so
regex patterns work consistently with the flag description. Empty
pattern (no -collection given) matches all collections.
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