Fix: FEM part lookup (exclude _i.prt), hole_count unit (Constant not mm), add file logging

- solve_simulation.py: FEM finder now excludes idealized parts, falls back to loading .fem
- solve_simulation.py: hole_count written as [Constant] not [MilliMeter] in .exp
- run_doe.py: dual logging to console + results/doe_run.log

projects/hydrotech-beam/studies/01_doe_landscape/run_doe.py

@@ -644,13 +644,26 @@ def main() -> None:
     """Entry point."""
     args = parse_args()
 
-    # Configure logging
+    # Configure logging — console + file
     log_level = logging.DEBUG if args.verbose else logging.INFO
+    log_format = "%(asctime)s [%(levelname)-7s] %(name)s: %(message)s"
+    log_datefmt = "%Y-%m-%d %H:%M:%S"
+
+    # Ensure results dir exists for log file
+    results_dir = Path(args.results_dir)
+    results_dir.mkdir(parents=True, exist_ok=True)
+    log_file = results_dir / "doe_run.log"
+
     logging.basicConfig(
         level=log_level,
-        format="%(asctime)s [%(levelname)-7s] %(name)s: %(message)s",
-        datefmt="%Y-%m-%d %H:%M:%S",
+        format=log_format,
+        datefmt=log_datefmt,
+        handlers=[
+            logging.StreamHandler(),  # console
+            logging.FileHandler(log_file, mode="a", encoding="utf-8"),  # file
+        ],
     )
+    logger.info("Log file: %s", log_file.resolve())
 
     # Run
     try: