Detect the remote platform on connect and Test SSH: uname first (Linux/Darwin
keep the POSIX lifecycle), else an encoded-PowerShell probe that routes a
Windows host through connectWindowsRemote. The Windows lifecycle mirrors the
POSIX one — probe, one-shot token upload, spawn, readiness scrape, tunnel,
reuse-by-exact-ownership, and teardown — over a PowerShell helper dialect.
Preserve a backend on indeterminate process state (never destroy on unknowns);
a thrown terminate aborts before remove-lock so a live backend is never
orphaned. Interactive terminals on a Windows backend open PowerShell in the
requested cwd instead of a POSIX login shell.
yoniebans
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