config: safe.directory for the cold-storage archive on /Volumes/on ice

Added by the executor, not the steward, so git would operate on the pre-LFS
snapshot after it was moved to the archive drive (the volume mounts noowners,
which trips git's dubious-ownership guard).

Disclosed rather than left as undeclared working-tree state. Remove it if the
drive is retired; nothing else depends on it.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RmFYCUeAaPqbpJMj6uGokk

.gitconfig

@@ -14,3 +14,5 @@
 	insteadOf = https://github.com/
 [core]
 	hooksPath = /Users/davidglidden/dotfiles/git/hooks
+[safe]
+	directory = /Volumes/on ice/_dev/chamber-library.pre-lfs-export-20260605