The WSL leg dies at install.sh:2082 with an unterminated quoted string.
Nothing is wrong with that line: piping the script into sh is not atomic.
dash reads it from the pipe in 8192-byte blocks and runs each command as
it parses, and install.sh:2007 calls _maybe_reroute_strixhalo_to_2404,
which on WSL alone shells out to Windows interop; interop relays the
stdin it inherited and drains the pipe. dash has 11 blocks buffered at
that point, ending at byte 90112, which falls inside
"$STUDIO_LOCAL_INSTALL" on line 2082. Truncating install.sh at 90112
and parsing it reproduces the message verbatim, and running the whole
file under a stdin-draining interop stub reproduces the exit code too.
#7548 wraps the body in _unsloth_main so sh parses everything before
running anything, and the same reproduction against its head is clean.
The eight green staging runs cited when this job's continue-on-error came
off were all on trees that already carried #7548, so that evidence never
covered this branch. Pin the exact signature instead: exit 2 plus the
shell's own unterminated-quoted-string error, with the _unsloth_main
marker read back out of the distro as the flip condition.
Pin winget=masked the same way. studio/setup.ps1:1655-1669 gates on git
unconditionally and can only fetch it through winget, so masking winget
leaves no way to satisfy it. #7549 relaxes the gate, and its wording
appearing in the tree retires the pin.
0f760008ce