feat: Add AtomizerField training data export and intelligent model discovery

Major additions:
- Training data export system for AtomizerField neural network training
- Bracket stiffness optimization study with 50+ training samples
- Intelligent NX model discovery (auto-detect solutions, expressions, mesh)
- Result extractors module for displacement, stress, frequency, mass
- User-generated NX journals for advanced workflows
- Archive structure for legacy scripts and test outputs
- Protocol documentation and dashboard launcher

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

optimization_engine/extractors/catalog.json

@@ -0,0 +1,38 @@
+{
+  "381739e9cada3a48": {
+    "name": "extract_displacement",
+    "filename": "extract_displacement.py",
+    "action": "extract_displacement",
+    "domain": "result_extraction",
+    "description": "Extract maximum displacement from structural analysis",
+    "params": {
+      "result_type": "displacement",
+      "metric": "maximum"
+    },
+    "signature": "381739e9cada3a48"
+  },
+  "63d54f297f2403e4": {
+    "name": "extract_von_mises_stress",
+    "filename": "extract_von_mises_stress.py",
+    "action": "extract_von_mises_stress",
+    "domain": "result_extraction",
+    "description": "Extract maximum von Mises stress from structural analysis",
+    "params": {
+      "result_type": "von_mises_stress",
+      "metric": "maximum"
+    },
+    "signature": "63d54f297f2403e4"
+  },
+  "2f58f241a96afb1f": {
+    "name": "extract_mass",
+    "filename": "extract_mass.py",
+    "action": "extract_mass",
+    "domain": "result_extraction",
+    "description": "Extract total structural mass",
+    "params": {
+      "result_type": "mass",
+      "metric": "total"
+    },
+    "signature": "2f58f241a96afb1f"
+  }
+}