first_time_install.sh granted the web user safe_plugin_rm.sh but not
safe_pip_install.sh, unlike scripts/install/configure_web_sudo.sh. On devices
set up only by the first-time installer, install_requirements_file could not
use the root wrapper and fell back to a user-level install that root-run
ledmatrix.service may not see.
Also harden both sudo-granted helpers to root:root 755. first_time_install.sh
never did this, and Step 11's project-wide chown to the user would undo it if
placed in Step 10, so it runs at the end of Step 11.1.
Add a test that parses the ledmatrix_web sudoers rules from both installers
and asserts they grant the same commands, and that every granted helper is
hardened (after the chown, in first_time_install.sh).
Co-authored-by: Claude Opus 5 <noreply@anthropic.com>
