Fix uninstall.sh to use root's config dir when unregistering

When running `sudo ggo agent unregister`, the command looks for config
in the calling user's home directory, not root's. This causes it to
report "Agent is not registered" even when the agent IS registered
under root.

Fix by explicitly passing --config-dir /root/.gpugo/config when
needs_sudo is true, ensuring the unregister command finds the actual
agent configuration.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: andystime

scripts/uninstall.sh

@@ -300,11 +300,13 @@ unregister_from_server() {
     fi
 
     # Run unregister command (don't suppress output so user can see what happened)
+    # When using sudo, explicitly specify root's config dir since the command
+    # defaults to the calling user's home directory, not root's
     local unregister_result=0
     if [ "${needs_sudo}" = "true" ]; then
         SUDO=$(get_sudo)
         if [ -n "${SUDO}" ]; then
-            ${SUDO} "${binary_path}" agent unregister --force || unregister_result=$?
+            ${SUDO} "${binary_path}" agent unregister --config-dir /root/.gpugo/config --force || unregister_result=$?
         else
             warn "Sudo not available, attempting unregister without sudo (may fail)"
             "${binary_path}" agent unregister --force || unregister_result=$?