hands: pin models v19b (contact taught from the bounty prompts)

Hugging Face DeeJanuz/frametop-hands-models 52d3a65, v19b/. Held thumb-index
pinches from the bounty rounds read closed 58% of the time (v16b 21%); replays
track the same hands as v16b. Headset-tested by the maintainer.

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

hands/models.pin

@@ -5,12 +5,12 @@
 # needs to run them: raise it when a model needs a newer ft-hands, and older installs keep theirs.
 # Made by frame-hands' model-repo/pin.py.
 format 1
-rev d96e56599b0af18fc05af2a0a4489985914b754a
-model v16b
-file NOTICE 0d31ad8d108fc01e9fc4c5612eb5a9b16d90f9a971e6677cafe4969c2388fc06
-file hand.ncnn.bin c602ad2344bd1676a628fc8ab4fca2f53574b9f12bc97c705f47762d23f5f941
+rev 52d3a657abcf0cef7db48f90c5fefb281ff4b5b7
+model v19b
+file NOTICE 96fc8914e0220e51222362d141e0495e3425081d9898c21899b63e68df358ca6
+file hand.ncnn.bin 010f96a9316d0d935f2baf4951770130402bddc126b0066b4d8b3ba2754fdc9a
 file hand.ncnn.param 54e08f284ff6f121ff00f4a9c65afc38c0dbb22a32f4af44fc4e0fde6c4a1bbd
 file palm.ncnn.bin 9865f5fa3c6bc885cb0b50f201c4ac1bd83b2c1ad64af4e122efa3fc56d61909
 file palm.ncnn.param c61df2dde5b221a55c35c9693e530845a95ce2732949a9b3d3c583e3b2bae92e
 file LICENSE 41003d4a74749c0220e33dd415042164b5a1093ed401f36277234f772d22d3d0
-file README.md 322fc0b146d301865592958ba4dd512bf249836816b578f0919a2f671f3f014c
+file README.md 3393752d047bc3dd4e23fca47e3c29e4ae37c13be8dae1dae3412be55f4085f0