Flexible lanes load slower; purge at the previous filament's temperature

- flex_lanes.cfg: a 5 s poller sets SET_LONG_MOVE_SPEED to 50 mm/s (AFC's
  minimum) for lanes whose material is TPU/TPE/flex and back to the
  configured long_moves_speed otherwise; reapplied after a restart.
- BLOBIFIER_CHECKED: remembers the temperature of the filament in the
  nozzle (saved nozzle_last_temp). When it is more than flush_margin
  (10C) above the new filament's, the purge runs at that temperature and
  the nozzle cools back afterwards, so the leftover melts out (seen: ASA
  leftover with TPU loaded at 210C).

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

README.md

@@ -37,7 +37,8 @@ everything below, grouped by topic. Comment out what you do not use there.
 | **afc/** | | |
 | `xy_safety_check.cfg` | `AFC_XY_SAFETY_CHECK`, `_AFC_STORE_HOME_REFERENCE`, `AFC_XY_RESUME`: lost-step check around tool changes | `extras/xy_drift.py` (CoreXY) |
 | `lane_tools.cfg` | `LANE_FEED_UNTIL_HUB_OPEN`, `LANE_FEED_ABORT` | AFC |
-| `purge_check.cfg` | `BLOBIFIER_CHECKED`: checks every AFC purge with bd_pressure (and optionally bdwidth motion); a bd_pressure that does not answer fails the check, `PURGE_CHECK_IGNORE_SENSOR` lets the current print finish without it | Blobifier, AFC, `extras/bdpressure_check.py` + bd_pressure load-check firmware, `extras/bdwidth_status.py` |
+| `purge_check.cfg` | `BLOBIFIER_CHECKED`: checks every AFC purge with bd_pressure (and optionally bdwidth motion); a bd_pressure that does not answer fails the check, `PURGE_CHECK_IGNORE_SENSOR` lets the current print finish without it; when the previous filament (saved `nozzle_last_temp`) needs more than 10°C above the new one, the purge runs at the previous filament's temperature and the nozzle cools back afterwards, so its leftover melts out | Blobifier, AFC, `extras/bdpressure_check.py` + bd_pressure load-check firmware, `extras/bdwidth_status.py` |
+| `flex_lanes.cfg` | Lanes holding TPU/TPE (material from Spoolman) get slower long moves (50 mm/s, AFC's minimum) through the tube; back to the configured speed when the lane holds something else. Polls every 5 s, reapplies after a restart. The last stretch into the extruder (`tool_load_speed`) stays as configured | AFC |
 | `purge_until_empty.cfg` | `PURGE_UNTIL_EMPTY`: purges a snapped filament out until there is no more nozzle pressure | same as `purge_check.cfg` |
 | **pressure_advance/** | | |
 | `bd_pressure.cfg` | `[bdpressure bd_pa]` (I2C on the Nitehawk) and the vendor macros `PA_CALIBRATE`, `PA_E`, `PA_RESET`, `PA_STATE`; `PA_CALIBRATE` no longer sets Z back to a value read before the test (wrong after a Z hop in `G28 XY`) | `bdpressure.py` from the bd_pressure repo |