fix: propagate run_doctor exit code in all launchers

All three launchers (deb, RPM, AppImage) used bare `exit` after
`run_doctor`, discarding the return code. Now uses `exit $?` so
non-zero exit codes from doctor diagnostics propagate correctly.

Also adds joekale-pp to README contributors for RPM doctor support.

Co-Authored-By: Claude <claude@anthropic.com>

README.md

@@ -180,6 +180,7 @@ Special thanks to:
 - **[noctuum](https://github.com/noctuum)** for the `CLAUDE_MENU_BAR` env var with configurable menu bar visibility and boolean alias support
 - **[typedrat](https://github.com/typedrat)** for the NixOS flake integration with build.sh, node-pty derivation, and CI auto-update
 - **[cbonnissent](https://github.com/cbonnissent)** for reverse-engineering the Cowork VM guest RPC protocol and fixing the KVM startup blocker
+- **[joekale-pp](https://github.com/joekale-pp)** for adding `--doctor` support to the RPM launcher
 
 ## Sponsorship
 

scripts/build-appimage.sh

@@ -78,7 +78,7 @@ source "$appdir/usr/lib/claude-desktop/launcher-common.sh"
 if [[ "${1:-}" == '--doctor' ]]; then
 	electron_path="$appdir/usr/lib/node_modules/electron/dist/electron"
 	run_doctor "$electron_path"
-	exit
+	exit $?
 fi
 
 # Setup logging and environment

scripts/build-deb-package.sh

@@ -98,7 +98,7 @@ source "/usr/lib/$package_name/launcher-common.sh"
 if [[ "\${1:-}" == '--doctor' ]]; then
 	local_electron_path="/usr/lib/$package_name/node_modules/electron/dist/electron"
 	run_doctor "\$local_electron_path"
-	exit
+	exit \$?
 fi
 
 # Setup logging and environment

scripts/build-rpm-package.sh

@@ -83,7 +83,7 @@ source "/usr/lib/$package_name/launcher-common.sh"
 if [[ "\${1:-}" == '--doctor' ]]; then
 	local_electron_path="/usr/lib/$package_name/node_modules/electron/dist/electron"
 	run_doctor "\$local_electron_path"
-	exit
+	exit \$?
 fi
 
 # Setup logging and environment