robot/: point the old-sketch references to 2019-teensy-nrf24/Hexapod_Teensy

Comments in Config.h and the README referred to LEGACY/, which is folded into the generation folders. Also 'from the repo root' -> 'from the 2026-current folder'. Comment and documentation changes only; approved by the owner.

2026-current/robot/README.md

@@ -8,7 +8,7 @@ sketches compile against.
 
 ## Building
 
-From the repo root (PlatformIO): `pio run -e robot`, flash with
+From the `2026-current` folder (PlatformIO): `pio run -e robot`, flash with
 `pio run -e robot -t upload`, monitor with `pio device monitor -e robot`.
 RF24 is pulled in automatically via `lib_deps`. Servos are driven by the
 Teensy's hardware PWM directly, so no servo library is needed.
@@ -33,7 +33,7 @@ still a placeholder. Check all of it against the real robot:
   width.
 - `SERVOS`: one entry per servo with pin, pulse at 0°, signed µs per
   degree (sign = direction) and pulse limits. It's prefilled from the old
-  robot sketch (`LEGACY/Hexapod_Teensy/config.h`): pins, ranges, trims, and
+  robot sketch (`../../2019-teensy-nrf24/Hexapod_Teensy/config.h`): pins, ranges, trims, and
   directions from the old Unity servo mapping. Check every joint's
   direction on the bench.
 - **Before powering up:** re-mount the rear-left and front-left coxa servo