pacman -Qdtq exits with code 1 when there are no orphans, which is not an error condition. Handle this gracefully by returning nil instead of an error.
Introduces log.Debug() function that respects a Verbose config flag, replacing direct [debug] fmt.Fprintf calls throughout the codebase. This allows debug logging to be toggled via -v/--verbose CLI flag.
Split fetch into alpm and aur subpackages for better organization.
Rename state to log. Split pacman into read and sync subpackages.
Remove validation in favor of read.DBFreshness.
The dyalpm library's SyncDBs() returns an empty slice, causing packages
from official repos (extra, core, multilib) to not be found. This fix
manually registers each repo after getting an empty result.
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