FIX: Resolve all paths to absolute before passing to NX

Root cause: Path.absolute() on Windows does NOT resolve '..' components.
sim_file_path was reaching NX as '...\studies\01_doe_landscape\..\..\models\Beam_sim1.sim'
NX likely can't resolve referenced parts from a path with '..' in it.

Fixes:
- nx_interface.py: glob from self.model_dir (resolved) not model_dir (raw)
- solver.py: sim_file.resolve() instead of sim_file.absolute()
- solve_simulation.py: os.path.abspath(sim_file_path) at entry point
- Diagnostic logging still in place for next run

optimization_engine/nx/solve_simulation.py

@@ -209,8 +209,9 @@ def main(args):
             name, value = arg.split("=", 1)
             expression_updates[name] = float(value)
 
-    # Get working directory
-    working_dir = os.path.dirname(os.path.abspath(sim_file_path))
+    # Resolve ALL paths to absolute — NX can fail silently with ".." in paths
+    sim_file_path = os.path.abspath(sim_file_path)
+    working_dir = os.path.dirname(sim_file_path)
     sim_filename = os.path.basename(sim_file_path)
 
     print(f"[JOURNAL] " + "=" * 60)

optimization_engine/nx/solver.py

@@ -414,7 +414,8 @@ class NXSolver:
 
             # Create a custom journal that passes the sim file path, solution name, and expression values
             # Build argv list with expression updates
-            argv_list = [f"r'{sim_file.absolute()}'"]
+            # MUST use resolve() not absolute() — absolute() doesn't resolve ".." on Windows
+            argv_list = [f"r'{sim_file.resolve()}'"]
 
             # Add solution name if provided (passed as second argument)
             if solution_name: