Include human id in namespace commit messages
assign_id and unassign_id now append `<ns>-<human>` to the commit
message they write, so `tsk log namespace` shows which task each entry
refers to (e.g. "assign-id tsk-5", "share alpha-3") instead of the
ambiguous bare verb.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>