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_V2/2_results/intelligent_optimizer/confidence_history.json

@@ -0,0 +1 @@
+[]

studies/bracket_stiffness_optimization_V2/2_results/intelligent_optimizer/optimizer_state.json

@@ -0,0 +1,12 @@
+{
+  "timestamp": "2025-11-21T15:27:28.828930",
+  "trial_number": 29,
+  "total_trials": 30,
+  "current_phase": "characterization",
+  "current_strategy": null,
+  "is_multi_objective": true,
+  "study_directions": [
+    "1",
+    "1"
+  ]
+}

studies/bracket_stiffness_optimization_V2/2_results/intelligent_optimizer/strategy_history.json

@@ -0,0 +1 @@
+[]

studies/bracket_stiffness_optimization_V2/2_results/intelligent_optimizer/trial_log.json

@@ -0,0 +1 @@
+[]