2019: add the May 2019 printed robot parts (STL)

Fusion 360 STL exports of the body, legs, hinges, foot, servo horn and
test legs into robot-parts/, and an early remote part into remote-case/.
Found in an old Hexapod folder; the remote files that came with them were
already in the repo.

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

2019-teensy-nrf24/README.md

@@ -11,6 +11,7 @@ remote's USB passthrough, or from the remote's sliders.
 | `remote/` | remote: Nextion screen, 6 joystick axes with EEPROM calibration, MPU6050, nRF24 (CE 9, CSN 10), USB passthrough at 250000 |
 | `remote-nextion/` | `remote.HMI`, the Nextion Editor design (6 pages: servo monitor, upload screen) |
 | `remote-case/` | 3D-print files of the remote case and bezel, an Arduino Mega cover plate, a font |
+| `robot-parts/` | May 2019 Fusion 360 STL exports of the robot's printed parts: body top and bottom, legs, hinges, foot (`sock.stl`), Hitec servo horn, test legs. Early versions of the designs in `../2026-current/hardware/fusion360/` |
 | `tests/` | May 2019 bring-up sketches: SSC-32 command emulator (first step to replacing the SSC-32), nRF24 and MPU6050 tests with the robot's pins |
 
 Its hardware facts (pins, ranges, trims) were carried over into `../2026-current/robot/Config.h`.