* fix(ghidra): retain launcher command outcome in launch failure diagnostics
Ghidra headless launch failures surfaced only the GhidraLaunchError name
and a generic message, dropping the launcher command's exit code/signal
and JVM stderr. Retain the failed command outcome on GhidraLaunchError in
the shared captured-output envelope and project it as launch_outcome in
the session failure_cause, mirroring the compiler_outcome diagnostics.
Fixes#1992
* test(ghidra): skip POSIX JVM fixture tests on Windows
The bin/java fixture is an extensionless POSIX shell script handed to
execFile, which Windows cannot execute. Follow the repo pattern
(test.skipIf) so the suite is a named Windows skip.
