Allow the existing "Open in" entries to launch a configured VS Code
launcher against an SSH-backed worktree via Remote-SSH:
code --remote ssh-remote+<authority> <remote-path>
- Split the blanket SSH/runtime block into a capability model: file
managers and non-VS Code launchers stay local-only (disabled with
"Local only" metadata); a recognized VS Code command is enabled and
forwarded with connectionId over a typed object IPC.
- Main process stays authoritative: rejects active/owned runtimes,
resolves the SshTarget from the persisted Store, derives the authority
(config alias, or username@host on port 22, or ssh-alias-required on a
non-default port), validates POSIX/Windows absolute remote paths without
local stat/normalize, and rejects non-VS Code and compound commands
before spawn.
- Authority and remote path are passed as separate argv; getSpawnArgsForWindows
remains the cmd/bat shim boundary and fails closed on metacharacters.
- Same capability rules across the worktree menu, Explorer overflow, and
the source-control entry context menu.
Refs STA-2386
Closes#9999
