Add FastTD3 HoReKa experiment management system

- Fixed JAX/PyTorch dtype mismatch for successful training
- Added experiment plan with paper-accurate hyperparameters
- Created batch submission and monitoring scripts
- Cleaned up log files and updated gitignore
- Ready for systematic paper replication

.gitignore

@@ -1,5 +1,23 @@
-models
-wandb
+# Model checkpoints and training outputs
+models/
+wandb/
+
+# Log files and job outputs  
+logs/
+*.out
+*.err
+fasttd3_*.out
+fasttd3_*.err
+
+# Experiment tracking
+experiment_tracking_*.yaml
+
+# Python
 *.pyc
+__pycache__/
 .ipynb_checkpoints
 fast_td3.egg-info/
+.venv
+
+# SLURM scripts (generated)
+scripts/