fix: move set_debug_mode to kugetsu-config.sh

The queue daemon crashes with 'set_debug_mode: command not found'
because cmd_continue() calls set_debug_mode(), but that function
was only defined in the main kugetsu script.

Instead of duplicating the function, move it to kugetsu-config.sh
which is always sourced before kugetsu-session.sh in all contexts.

Fixes #207

skills/kugetsu/scripts/kugetsu-config.sh

@@ -64,3 +64,26 @@ load_agent_env() {
         set +a
     fi
 }
+
+set_debug_mode() {
+    local filtered_args=()
+    local debug_mode=false
+    
+    for arg in "$@"; do
+        case "$arg" in
+            --debug)
+                debug_mode=true
+                ;;
+            *)
+                filtered_args+=("$arg")
+                ;;
+        esac
+    done
+    
+    if [ "$debug_mode" = true ]; then
+        export KUGETSU_VERBOSITY="debug"
+        echo "[DEBUG] Debug mode enabled" >&2
+    fi
+    
+    echo "${filtered_args[@]}"
+}