feat(V&V): Zernike pipeline validation - synthetic WFE generator + round-trip validator

- generate_synthetic_wfe.py: Creates synthetic OPD surfaces from known Zernike coefficients
- validate_zernike_roundtrip.py: Round-trip validation (generate → fit → compare)
- validation_suite/: 18 test cases (single mode, multi-mode, noisy, edge cases)
- All 18 test cases pass with 0.000 nm error (clean) and <0.3 nm (10nm noise)
- M1 params: 1200mm dia, 135.75mm inner radius, 50 Noll modes

Project: P-Zernike-Validation (GigaBIT M1)
Requested by: Adyn Miles (StarSpec) for risk reduction before M2/M3 ordering

tools/validation_suite/realistic_full_disk_truth.json

@@ -0,0 +1,31 @@
+{
+  "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": 124980,
+  "diameter_mm": 1200.0,
+  "rms_nm_clean": 40.21839241800354,
+  "rms_nm_with_noise": 40.21839241800354,
+  "noise_rms_nm": 0.0,
+  "seed": 42,
+  "inner_radius_mm": 0.0
+}