Drop the PARK= opt-out from TOOL_LOCATE_SENSOR

The station pass needs an empty carriage, so with a toolchanger it always
parks: PARK=0 only said "I docked it by hand", which the sensor check
right below already decides for itself. Without [ff_toolchange] there is
no TOOLCHANGE_PARK to call and no sensor to ask, so the pass just runs --
where it used to demand PARK=0 before it would.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UfsqVZ3aXL3qxr3BFDS35x

docs/how-calibration-works.md

@@ -86,9 +86,9 @@ difference between a first layer that sticks and one that does not.
 
 #### `TOOL_LOCATE_SENSOR` — the reference
 
-`[PARK=1] [SAVE=1]`
+`[SAVE=1]`
 
-1. Parks the mounted tool (`PARK=0` if you docked it by hand) and verifies
+1. Homes if any axis is unhomed, parks the mounted tool, and verifies
    the carriage really is empty, from the dock and grab sensors.
 2. Plate check: probes station Z with the bare carriage, then sideways for
    the bore edge.
@@ -107,8 +107,9 @@ carriage** — select the tool first.
 
 `[SAVE=1]`
 
-1. Plate check. It needs an empty carriage, so it parks your tool and picks
-   it straight back up — that is expected, not a fault.
+1. Homes if any axis is unhomed, then the plate check. Both need an empty
+   carriage, so your tool is parked and picked straight back up — that is
+   expected, not a fault.
 2. Zeroes the G-code offset and works in raw machine coordinates.
 3. Same two passes as above, from `cylinder_x − 12.5` (16.0 stock), with the
    nozzle doing the touching.

pkgs/klipper/payload/klipper/klippy/extras/ff_tool_offset.py

@@ -785,20 +785,18 @@ class FFToolOffset:
 
     cmd_TOOL_LOCATE_SENSOR_help = (
         "Locate the station with an EMPTY carriage (station_x/y/z) "
-        "([PARK=1] [SAVE=1] [PLATE_CHECK=1] [SAMPLES=] [SAMPLES_TOLERANCE=]"
+        "([SAVE=1] [PLATE_CHECK=1] [SAMPLES=] [SAMPLES_TOLERANCE=]"
         " [SAMPLES_TOLERANCE_RETRIES=] [SAMPLES_RESULT=]"
         " [SAMPLE_RETRACT_DIST=] [PROBE_SPEED=])")
 
     def cmd_TOOL_LOCATE_SENSOR(self, gcmd):
-        park = gcmd.get_int('PARK', 1, minval=0, maxval=1)
         save = gcmd.get_int('SAVE', 1, minval=0, maxval=1)
         try:
             self._check_homed(gcmd)
             if self.toolchange is not None:
-                if park:
-                    # releaseFourExtruder: the carriage must be empty for TS.
-                    self._run('TOOLCHANGE_PARK')
-                    self._wait_moves()
+                # releaseFourExtruder: the carriage must be empty for TS.
+                self._run('TOOLCHANGE_PARK')
+                self._wait_moves()
                 carriage = self.toolchange.get_status(self.reactor.monotonic())
                 if carriage.get('current_tool', -1) != -1 \
                    or not carriage.get('state_ok'):
@@ -806,10 +804,10 @@ class FFToolOffset:
                         "%s: carriage is not verifiably empty (%s) -- the"
                         " station pass must run with no tool mounted"
                         % (self.name, carriage.get('state_reason')))
-            elif park:
-                raise gcmd.error("%s: [ff_toolchange] not loaded -- park"
-                                 " the tool by hand and pass PARK=0."
-                                 % self.name)
+            # With no [ff_toolchange] there is no TOOLCHANGE_PARK to call and
+            # no sensor that can confirm the carriage is empty. Emptying it is
+            # the operator's job then, as it is on any printer without a
+            # toolchanger.
             self._run_plate_check(gcmd)
             cylinder_x, cylinder_y = self._cylinder()
             gcmd.respond_info("station calibration, start %.3f, %.3f"