Retract at print end, undo it at print start

Klipper's G10 retracts only once until a G11, and nothing sends G11 on
this printer: the G10 in PRINT_WARMUP used up the retract, so PRINT_END
never retracted and the nozzle leaked while cooling down.

- _NOZZLE_RETRACT retracts and remembers the amount in the saved
  variable nozzle_retract (survives restarts, capped at 15 mm).
  PRINT_END retracts 5 mm, PRINT_WARMUP 2 mm, CANCEL_PRINT 5 mm plus the
  park/PAUSE retract.
- _NOZZLE_UNRETRACT in PRINT_START pushes it back over the bucket before
  the wipe.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

macros/print/pause_resume.cfg

@@ -109,6 +109,8 @@ description: Cancel the actual running print
 rename_existing: CANCEL_PRINT_BASE_KLIPPERSCREEN
 variable_park: True
 gcode:
+  {% set pause = printer["gcode_macro PAUSE"] %}
+  {% set park_retract = printer['gcode_macro _TOOLHEAD_PARK_PAUSE_CANCEL'].extrude %}
   ## Move head and retract only if not already in the pause state and park set to true
 
   {% if printer.pause_resume.is_paused|lower == 'false' and park|lower == 'true'%}
@@ -117,6 +119,15 @@ gcode:
 
   STOP_HEAT_SOAK
   CANCEL_PRINT_BASE_KLIPPERSCREEN
+  # Same end-of-print retract as PRINT_END (skipped if the nozzle is already cold);
+  # EXTRA: the park retract of PAUSE or of the park above, so PRINT_START undoes it too
+  {% if printer.pause_resume.is_paused %}
+    _NOZZLE_RETRACT EXTRA={park_retract if pause.parked else 0}
+  {% elif park and printer.extruder.can_extrude %}
+    _NOZZLE_RETRACT EXTRA={park_retract}
+  {% else %}
+    _NOZZLE_RETRACT
+  {% endif %}
   # Same cleanup as PRINT_END: heaters incl. chamber heater, fan, flow, bdwidth
   _PRINT_CLEANUP
   SET_GCODE_VARIABLE MACRO=PAUSE VARIABLE=parked VALUE=False