feat(pull,push): match ares-cli path rules

[mariotaku]

ares-push and ares-pull used a trailing / on DESTINATION to decide the
layout. @webosose/ares-cli ignores the trailing slash and reads the layout
from what DESTINATION already is. This aligns both.

Path rules

SOURCE	DESTINATION	Result
a directory	missing, or a directory	DEST/<name>
a directory	a file	error
a lone file	a directory	DEST/<name>
a lone file	missing, or a file	DEST
many files	anything but a file	DEST/<name> each

So ares-push build /media/developer/apps now lands at
/media/developer/apps/build, as in ares-cli. Before it copied the contents
into /media/developer/apps.

Flags

-i, --ignore now means "Hide the detailed copy messages", which is what
ares-cli documents. Continue-on-error moves to a new -k, --keep-going.

Breaking: scripts using -i to keep going need -k.

Other compat fixes

• push makes missing parents of DESTINATION, like mkdir -p, with a cache so
  it does not re-stat per file.
• push copies a symlink to a file as its content, as ares-cli does.
• pull follows symlinks, the way find -follow does in ares-cli.
• pull probes SOURCE with stat, so a missing source reports
  "does not exist on the device".

Extensions past ares-cli gaps

• pull to a path whose parent is missing works. ares-cli throws ENOENT from
  lstatSync.
• pull skips a broken symlink with a message, and stops at 64 levels of
  nesting instead of looping.
• push skips a symlink to a directory with a message instead of failing.
• Everything runs over SFTP, so the device needs no find or mkdir.

Not changed

Output stays src => dst. ares-cli prints Push:src -> dst plus a
N file(s) pushed summary, but no other tool in this repo copies ares-cli
output.

Test

cargo test -p ares-pull -p ares-push — 14 tests, covering the path table
above and the device-path parent walk.

🤖 Generated with Claude Code