feat: Add NX study models and optimization histories

Includes all study folders with NX models for development:
- bracket_stiffness_optimization (V1, V2, V3)
- drone_gimbal_arm_optimization
- simple_beam_optimization
- uav_arm_optimization (V1, V2)
- training_data_export_test
- uav_arm_atomizerfield_test

Contains .prt, .fem, .sim files and optimization databases.

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

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

studies/bracket_stiffness_optimization_V2/workflow_config.json

@@ -0,0 +1,131 @@
+{
+  "workflow_name": "bracket_stiffness_workflow",
+  "description": "End-to-end workflow for bracket stiffness optimization",
+  "version": "1.0",
+
+  "workflow_steps": [
+    {
+      "step": 1,
+      "name": "update_design_variables",
+      "description": "Update NX model expressions with trial parameters",
+      "action": "nx_update_expressions",
+      "inputs": {
+        "model_file": "1_setup/model/Bracket.prt",
+        "expressions": {
+          "support_angle": "{{support_angle}}",
+          "tip_thickness": "{{tip_thickness}}"
+        }
+      },
+      "outputs": ["updated_model"],
+      "on_failure": "abort_trial"
+    },
+
+    {
+      "step": 2,
+      "name": "solve_simulation",
+      "description": "Run NX Nastran SOL 101 linear static analysis",
+      "action": "nx_solve",
+      "inputs": {
+        "sim_file": "1_setup/model/Bracket_sim1.sim",
+        "solver": "NX_Nastran",
+        "solution": "SOL101"
+      },
+      "outputs": ["op2_file", "f06_file"],
+      "on_failure": "abort_trial",
+      "timeout": 600
+    },
+
+    {
+      "step": 3,
+      "name": "export_displacement_field",
+      "description": "Export z-displacement field from results",
+      "action": "nx_journal",
+      "inputs": {
+        "journal_file": "1_setup/model/export_displacement_field.py",
+        "sim_file": "1_setup/model/Bracket_sim1.sim"
+      },
+      "outputs": ["field_file"],
+      "on_failure": "abort_trial"
+    },
+
+    {
+      "step": 4,
+      "name": "extract_results",
+      "description": "Extract stiffness and mass from FEA results",
+      "action": "python_extractor",
+      "inputs": {
+        "extractor_script": "bracket_stiffness_extractor.py",
+        "field_file": "1_setup/model/export_field_dz.fld",
+        "op2_file": "1_setup/model/Bracket_sim1.op2"
+      },
+      "outputs": {
+        "stiffness": "objectives.stiffness",
+        "mass": "objectives.mass",
+        "displacement": "displacement",
+        "force": "force"
+      },
+      "on_failure": "abort_trial"
+    },
+
+    {
+      "step": 5,
+      "name": "evaluate_constraints",
+      "description": "Check mass constraint (≤ 0.2 kg) - mark as infeasible but keep for surrogate",
+      "action": "constraint_check",
+      "inputs": {
+        "mass": "{{mass}}",
+        "max_mass": 0.2
+      },
+      "outputs": ["constraint_satisfied"],
+      "on_failure": "continue"
+    },
+
+    {
+      "step": 6,
+      "name": "report_results",
+      "description": "Send results to optimization engine and dashboard",
+      "action": "report",
+      "inputs": {
+        "trial_number": "{{trial_number}}",
+        "objectives": {
+          "stiffness": "{{stiffness}}",
+          "mass": "{{mass}}"
+        },
+        "design_variables": {
+          "support_angle": "{{support_angle}}",
+          "tip_thickness": "{{tip_thickness}}"
+        },
+        "metadata": {
+          "displacement": "{{displacement}}",
+          "force": "{{force}}"
+        }
+      },
+      "outputs": ["trial_complete"],
+      "on_failure": "log_error"
+    }
+  ],
+
+  "error_handling": {
+    "max_retries": 2,
+    "retry_delay": 5,
+    "fallback_action": "skip_trial",
+    "log_errors": true,
+    "error_log_file": "2_results/errors.log"
+  },
+
+  "cleanup": {
+    "delete_intermediate_files": false,
+    "archive_results": true,
+    "compress_op2": false
+  },
+
+  "logging": {
+    "level": "INFO",
+    "log_file": "2_results/workflow.log",
+    "console_output": true,
+    "log_rotation": {
+      "max_size_mb": 50,
+      "backup_count": 3
+    }
+  }
+}