feat(config): Add AtomizerSpec v2.0 schema and migrate all studies

Added JSON Schema:
- optimization_engine/schemas/atomizer_spec_v2.json

Migrated 28 studies to AtomizerSpec v2.0 format:
- Drone_Gimbal studies (1)
- M1_Mirror studies (21)
- M2_Mirror studies (2)
- SheetMetal_Bracket studies (4)

Each atomizer_spec.json is the unified configuration containing:
- Design variables with bounds and expressions
- Extractors (standard and custom)
- Objectives and constraints
- Optimization algorithm settings
- Canvas layout information

studies/support_mass_v1/atomizer_spec.json

@@ -0,0 +1,83 @@
+{
+  "meta": {
+    "version": "2.0",
+    "study_name": "support_mass_v1",
+    "description": "Minimize mass of structural support",
+    "created_by": "claude",
+    "created_at": "2026-01-18",
+    "modified_by": "claude",
+    "modified_at": "2026-01-18"
+  },
+  "model": {
+    "sim": {
+      "path": "",
+      "solver": "nastran",
+      "description": "Structural support model - to be configured in Canvas"
+    }
+  },
+  "design_variables": [],
+  "extractors": [
+    {
+      "id": "ext_001",
+      "name": "mass",
+      "type": "mass_bdf",
+      "description": "Total structural mass from BDF",
+      "config": {
+        "unit": "kg"
+      },
+      "enabled": true,
+      "canvas_position": {
+        "x": 400,
+        "y": 200
+      }
+    }
+  ],
+  "objectives": [
+    {
+      "id": "obj_001",
+      "name": "minimize_mass",
+      "direction": "minimize",
+      "weight": 1.0,
+      "extractor_id": "ext_001",
+      "enabled": true,
+      "canvas_position": {
+        "x": 600,
+        "y": 200
+      }
+    }
+  ],
+  "constraints": [],
+  "optimization": {
+    "algorithm": {
+      "type": "TPE",
+      "config": {
+        "n_startup_trials": 10,
+        "multivariate": true
+      }
+    },
+    "budget": {
+      "max_trials": 100,
+      "timeout_hours": null
+    },
+    "convergence": {
+      "enable_early_stopping": true,
+      "patience": 15,
+      "min_improvement": 0.001
+    }
+  },
+  "canvas": {
+    "edges": [
+      {
+        "id": "edge_001",
+        "source": "model",
+        "target": "ext_001"
+      },
+      {
+        "id": "edge_002",
+        "source": "ext_001",
+        "target": "obj_001"
+      }
+    ],
+    "layout_version": "2.0"
+  }
+}