kimo gc

Assets are content-addressed and merge add-only (spec §12), so files that nothing references build up in assets/. kimo gc home.kimo lists them (a dry run). kimo gc home.kimo --yes deletes them and removes their asset-manifest entries from the document with an atomic write.

--yes refuses to change anything while another process holds the file's lease (exit 3). The editor may have unsaved edits that use an asset. A lease whose process is gone is ignored. Leases live in ~/.kimo/locks, or under $KIMO_HOME/locks when KIMO_HOME is set.