overlayParity logged everything at debug, so at the default level nobody could
tell which overlay files a spawn actually received (#148 pt 3), and a tracked
file marked --skip-worktree gave no warning that it can no longer be edited
from that worktree (#134).
Report the outcome at info: a per-spawn summary naming the denominator (every
configured candidate), what was copied, and why anything was not — plus a
separate line naming every file marked --skip-worktree, stating plainly that
it cannot be committed from this worktree. No worktree-local marker file: the
worktree must hold exactly the configured overlay set and nothing else, so an
extra file would violate that invariant.
Dai Ha
ef8c97871e