Remove large files from tracking and update .gitignore

- Remove research PDF and performance report JSON from git tracking
- Update .gitignore to exclude PDFs and performance reports
- Fix TensorFlow deprecation issue (lr -> learning_rate)
- All core functionality tested and working

Author: csshafiqahmed

.gitignore

@@ -200,3 +200,11 @@ tmp/
 temp/
 *.tmp
 *.temp
+
+# Research papers and documentation
+*.pdf
+Research Article/
+
+# Performance reports and logs
+aidas_performance_report_*.json
+*.json