The marker probe (~8.3k chars encoded) was the second Windows SSH
command still over cmd.exe's 8191-char limit after the platform probe
moved to stdin: it died with 'The command line is too long' and the
relaunch gate could never observe CLEAR. Ride the same stdin transport
(powerShellStdinCommand) instead of splitting the probe, keeping the
C# no-follow marker reader and its fail-closed semantics intact, and
assert every emitted Windows probe command stays under the limit.
Co-authored-by: nikkoxgonzales <nikkoxgonzales@users.noreply.github.com>
Fixes#106716
Refs #106903
02a802a7ef