* feat(scp): add -v/--verbose and -i/--interactive flags
git scp/git rscp printed a diff via plain `git diff`/`git diff --stat`
with no `--no-pager` and no TTY check, blocking on the user's pager.
Add -v/--verbose to print the diff via --no-pager before syncing, and
-i/--interactive to also prompt for confirmation before the real
push/copy. Both apply to git scp and git rscp, and must precede
<remote>.
Updates man/git-scp.md and Commands.md.
* feat(scp): add -n/--dry-run flag
Add -n/--dry-run to preview a sync without changing anything: rsync
runs with -n, and git add --force / ssh ... rm are skipped outright.
Implies --verbose, since confirming or previewing with nothing shown
is useless.
Also restructures scp_and_stage's push/delete blocks from `&&`-chains
into if/then, needed to branch on dry-run, which incidentally fixes a
latent bug where a non-TTY COLOR_RESET could silently skip the real
rsync/git add/ssh rm calls.
Updates man/git-scp.md and Commands.md.
* test(scp): add coverage for -n/--dry-run and -i/--interactive abort
git-scp had no test coverage at all. Cover the two paths that need no
real remote destination: dry-run must preview without touching the
index, working tree, or remote path, and declining the interactive
confirmation must abort before anything syncs.
* feat(scp): Code review
* feat(scp): Code review
