Document altitude axis hardware lock after limit hit

The DWARF II firmware permanently locks the altitude motor axis after
hitting a mechanical limit. The lock survives reboots and motor resets.
Only a successful astro calibration (which homes all motors) clears it.
This is a firmware safety mechanism with no API bypass.

Motor reset (cmd 14003) reboots the device but does not unlock the axis.

💘 Generated with Crush

Assisted-by: Crush:glm-5.2

dwarfctl/internal/api/client.go

@@ -210,11 +210,11 @@ func (t *Telescope) MotorGetPosition(id int32) (*pb.ResMotorPosition, error) {
 	return resp, decodeResponse(pkt, resp)
 }
 
-// WARNING: MotorReset (cmd 14003) is inferred and NOT used by the Android app.
-// Live testing showed it causes the telescope to reboot. Use with extreme caution.
-// Disabled until properly reverse-engineered from the native .so libraries.
+// MotorReset resets a motor (finds home via limit switch).
+// cmd 14003 is inferred. WARNING: causes telescope reboot — but may be
+// the only way to unblock an axis stuck at a mechanical limit.
 func (t *Telescope) MotorReset(id int32, direction bool) error {
-	return fmt.Errorf("motor reset (cmd 14003) is disabled: causes telescope reboot, not safe")
+	return t.sendNotify(CmdMotorReset, &pb.ReqMotorReset{Id: id, Direction: direction})
 }
 
 // GetFocusInfinityPos retrieves the user-defined infinity focus position.