Fix KerasLSTM xfail strictness and add .venv to .gitignore

CudnnRNNV3 is unsupported in TFLite on macOS but works on Linux; using
strict=False allows XPASS on Linux and XFAIL on macOS without failing CI.
Also add .venv to .gitignore to prevent accidental project-local venv commits.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: DocGarbanzo

.gitignore

@@ -1,5 +1,6 @@
 
 env/*
+.venv
 data/*
 dist/*
 

donkeycar/tests/test_keras.py

@@ -26,8 +26,8 @@ def tmp_dir() -> str:
     KerasLinear, KerasCategorical, KerasInferred,
     # KerasLSTM uses CudnnRNNV3 which TFLite cannot run without CUDA
     pytest.param(KerasLSTM, marks=pytest.mark.xfail(
-        reason='KerasLSTM uses CudnnRNNV3, not supported in TFLite',
-        strict=True)),
+        reason='KerasLSTM uses CudnnRNNV3, not supported in TFLite on macOS',
+        strict=False)),
     KerasLocalizer, KerasIMU,
     Keras3D_CNN,
     KerasMemory, KerasBehavioral,