参考所有分组：补 fractional N 行号 source 覆盖，测试通过

test-all-native.sh

@@ -560,6 +560,8 @@ grep -F 'convert_lathe_diameter_mode() scales G7/G8 X words and G76 I/J/K words'
 grep -F 'tests/gcode/linuxcnc_lathe_diameter_mode.ngc' test-native.sh >/dev/null
 grep -F 'tests/gcode/linuxcnc_lathe_diameter_g76.ngc' test-native.sh >/dev/null
 grep -F 'tests/gcode/linuxcnc_readonly_named_parameters.ngc' test-native.sh >/dev/null
+grep -F 'read_n_number()' test-linuxcnc-source-link.sh >/dev/null
+grep -F 'tests/gcode/linuxcnc_fractional_linenumbers.ngc' test-linuxcnc-source-link.sh >/dev/null
 
 for script in \
     test-native.sh \