Two residual gaps from the #72707/#72632 probe-hardening series:
- backendSupportsServe never forwarded backend.shell to the serve
--help probe. A .cmd/.bat shim backend (which carries shell: true in
its step-4 descriptor) makes execFileSync throw EINVAL on modern
Node; the bare catch then caches supported=false for the process
lifetime, permanently routing that backend through the legacy
dashboard form. Forward the flag.
- The Windows python-discovery probes ran with no timeout at all:
reg query (registry read) and py.exe -c 'import sys;...' (bare
interpreter startup) are both synchronous execs on the boot path;
a wedged reg.exe or python.exe would hang the resolver forever.
Bound reg query at 5s and the py.exe probe at the shared
PROBE_TIMEOUT_MS budget.
472658d014