VoipAppz Builder 0.1.9

Run WSL commands with --exec so their quoting survives, v0.1.9

wsl.exe without --exec hands the command line to the distro's default
shell first, which removed the quoting Builder adds: the pre-flight tool
check lost its loop variable and reported git, make, bash and curl as
missing in a distro that has them. The same applied to make and the
agent.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>