Fix: Include benchmark result JSON files in version control

- Removed results/ from .gitignore (kept *.pt for large binaries)
- Added switching_lds_benchmark.json
- Added cmapss_benchmark.json
- Added benchmark_20260220_135749.json

Author: sunghunkwag

.gitignore

@@ -2,7 +2,7 @@ __pycache__/
 *.pyc
 *.pyo
 *.egg-info/
-results/
+results/*.pt
 figures/
 .pytest_cache/
 .coverage