feat(V&V): Updated to FEA CSV format + real M2 mesh injection

- Output now matches WFE_from_CSV_OPD format: ,X,Y,Z,DX,DY,DZ (meters)
- Suite regenerated using real M2 mesh (357 nodes, 308mm diameter)
- All 14 clean test cases: PASS (0.000 nm error)
- 3 noisy cases: expected FAIL due to low node count amplifying noise
- Added --inject mode to use real FEA mesh geometry
- Added lateral displacement test case

tools/validation_suite/realistic_with_lateral_truth.json

@@ -0,0 +1,36 @@
+{
+  "input_coefficients": {
+    "5": 80.0,
+    "6": 45.0,
+    "7": 30.0,
+    "8": 20.0,
+    "9": 15.0,
+    "11": 10.0,
+    "13": 5.0,
+    "16": 3.0,
+    "22": 2.0
+  },
+  "coefficient_names": {
+    "5": "Astigmatism 45\u00b0",
+    "6": "Astigmatism 0\u00b0",
+    "7": "Coma X",
+    "8": "Coma Y",
+    "9": "Trefoil X",
+    "11": "Primary Spherical",
+    "13": "2nd Astig Y",
+    "16": "2nd Coma X",
+    "22": "2nd Spherical"
+  },
+  "n_points": 357,
+  "diameter_mm": 308.4492626330409,
+  "rms_nm_clean": 42.14873971447113,
+  "rms_nm_with_noise": 42.14873971447113,
+  "noise_rms_nm": 0.0,
+  "include_lateral": true,
+  "seed": 42,
+  "units": {
+    "positions": "meters",
+    "displacements": "meters",
+    "coefficients": "nanometers"
+  }
+}