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

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

@@ -183,16 +183,18 @@ class AtomizerNXSolver:
             logger.info("Using existing model backup at %s", self._backup_dir)
 
         # Find the .sim file
-        sim_files = list(model_dir.glob("*.sim"))
+        # Use resolved model_dir for all path operations (NX needs clean absolute paths)
+        sim_files = list(self.model_dir.glob("*.sim"))
         if not sim_files:
-            raise FileNotFoundError(f"No .sim file found in {model_dir}")
-        self.sim_file = sim_files[0]
+            raise FileNotFoundError(f"No .sim file found in {self.model_dir}")
+        self.sim_file = sim_files[0]  # Already absolute (from resolved parent)
         logger.info("SIM file: %s", self.sim_file.name)
+        logger.info("SIM path: %s", self.sim_file)
 
         # Find the .prt file (for mass extraction)
-        prt_files = [f for f in model_dir.glob("*.prt") if "_i." not in f.name]
+        prt_files = [f for f in self.model_dir.glob("*.prt") if "_i." not in f.name]
         if not prt_files:
-            raise FileNotFoundError(f"No .prt file found in {model_dir}")
+            raise FileNotFoundError(f"No .prt file found in {self.model_dir}")
         self.prt_file = prt_files[0]
         logger.info("PRT file: %s", self.prt_file.name)