Move bd_pressure.cfg and TEST_SPEED into the repo

All macros now come from this repo. bd_pressure.cfg ([bdpressure bd_pa]
and the vendor PA_CALIBRATE macros) and Macros/TEST_SPEED.cfg were loose
files in ~/printer_data/config.

PA_CALIBRATE no longer sets Z back to z_current at the end: it was read
before the test ran, so a Z hop in the G28 XY (Beacon home_z_hop) would
leave Klipper believing the nozzle is lower than it is. Z is never switched
off or moved by the test, so it keeps its position without that line.
The ACC_WALL bug (read from ACCEL_TO_DECEL, always 4000) is documented,
not fixed: the cached PA values were measured at 4000.

printer.cfg must drop [include bd_pressure.cfg] and Macros/macros.cfg its
TEST_SPEED include, else the old copies (included later) still win.

Reference values from the load-check-afc branch and from the guard and
Z check tests added to CLAUDE.md.

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

CLAUDE.md

@@ -94,7 +94,12 @@ detection, `filament_error_sensitivity`), iHeater chamber heater.
 ## Reference values
 
 - Purge check (150 mm Blobifier purge): good load = longest pressure
-  13-18 s, peak 64-181; empty nozzle about 30 ms.
+  13-18 s, peak 64-181; empty nozzle about 30 ms. A real failed load in a
+  print start (AFC reported the lane loaded, nothing reached the nozzle):
+  longest 1915 ms, peak 45, caught by the 5000 ms limit.
+- Nozzle guard (bdp_guard): reading at rest and in travel peaks about 2; a
+  light finger push on the cold nozzle gives 41 (threshold 30).
+- Z check after a contact homing: Beacon vs Klipper Z about 0.06 mm.
 - XY drift check: endstop noise about 0.01-0.02 mm; limit 0.1 mm (one motor
   skipping one cycle = 0.4 mm shows as 0.2 mm in X and Y).