Description 480 -> 248 chars, body 1011 -> 347 words. The single
submodules.md splits into setup-and-update, urls-and-config, and removal.
Restores three regressions the first pass introduced: 'repointing' as the
trigger for the URL branch, which had none while the boundary clause
steered those queries to git-remotes; clone and absorbgitdirs in the output
enum, which dispatch still routed to; and status --cached, the flag that
makes the pre-commit pointer gate verifiable.
Defame1297
261e5b5491