chore: keep debug tools installed in install script

Author: luoliwoshang

install.sh

@@ -5,13 +5,11 @@ set -e
 go install -v ./cmd/llcppcfg
 go install -v ./cmd/llcppgtest
 
-# Optional standalone debug modules:
-# The main pipeline is now fully orchestrated by the single `llcppg` binary,
-# and built with LLGo, so these are not required for normal installation.
-# Keep them here for on-demand debugging or isolated tool usage.
-# llgo install ./_xtool/llcppsymg
-# llgo install ./_xtool/llcppsigfetch
-# llgo install -v ./cmd/gogensig
+# Main pipeline does not depend on the tools below.
+# They are mainly installed for debugging and standalone troubleshooting.
+llgo install ./_xtool/llcppsymg
+llgo install ./_xtool/llcppsigfetch
+llgo install -v ./cmd/gogensig
 
 # main process required
 llgo install -v ./cmd/llcppg