feat: Add OPD method support to Zernike visualization with Standard/OPD toggle

Major improvements to Zernike WFE visualization:

- Add ZernikeDashboardInsight: Unified dashboard with all orientations (40°, 60°, 90°)
  on one page with light theme and executive summary
- Add OPD method toggle: Switch between Standard (Z-only) and OPD (X,Y,Z) methods
  in ZernikeWFEInsight with interactive buttons
- Add lateral displacement maps: Visualize X,Y displacement for each orientation
- Add displacement component views: Toggle between WFE, ΔX, ΔY, ΔZ in relative views
- Add metrics comparison table showing both methods side-by-side

New extractors:
- extract_zernike_figure.py: ZernikeOPDExtractor using BDF geometry interpolation
- extract_zernike_opd.py: Parabola-based OPD with focal length

Key finding: OPD method gives 8-11% higher WFE values than Standard method
(more conservative/accurate for surfaces with lateral displacement under gravity)

Documentation updates:
- SYS_12: Added E22 ZernikeOPD as recommended method
- SYS_16: Added ZernikeDashboard, updated ZernikeWFE with OPD features
- Cheatsheet: Added Zernike method comparison table

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.claude/skills/01_CHEATSHEET.md

@@ -1,7 +1,7 @@
 ---
 skill_id: SKILL_001
-version: 2.0
-last_updated: 2025-12-07
+version: 2.1
+last_updated: 2025-12-22
 type: reference
 code_dependencies:
   - optimization_engine/extractors/__init__.py
@@ -12,8 +12,8 @@ requires_skills:
 
 # Atomizer Quick Reference Cheatsheet
 
-**Version**: 2.0
-**Updated**: 2025-12-07
+**Version**: 2.1
+**Updated**: 2025-12-22
 **Purpose**: Rapid lookup for common operations. "I want X → Use Y"
 
 ---
@@ -45,10 +45,12 @@ requires_skills:
 | CAD expression mass | E5 | `extract_mass_from_expression(prt_file, expression_name='p173')` |
 | Field data | E6 | `FieldDataExtractor(field_file, result_column, aggregation)` |
 | Stiffness (k=F/δ) | E7 | `StiffnessCalculator(...)` |
-| Zernike WFE | E8 | `extract_zernike_from_op2(op2_file, bdf_file, subcase)` |
+| Zernike WFE (standard) | E8 | `extract_zernike_from_op2(op2_file, bdf_file, subcase)` |
 | Zernike relative | E9 | `extract_zernike_relative_rms(op2_file, bdf_file, target, ref)` |
 | Zernike builder | E10 | `ZernikeObjectiveBuilder(op2_finder)` |
 | Part mass + material | E11 | `extract_part_mass_material(prt_file)` → mass, volume, material |
+| Zernike Analytic | E20 | `extract_zernike_analytic(op2_file, focal_length=5000.0)` |
+| **Zernike OPD** | E22 | `extract_zernike_opd(op2_file)` ← **Most rigorous, RECOMMENDED** |
 
 > **Mass extraction tip**: Always use E11 (geometry .prt) over E4 (BDF) for accuracy.
 > pyNastran under-reports mass ~7% on hex-dominant meshes with tet/pyramid fills.
@@ -303,12 +305,20 @@ Generate physics-focused visualizations from FEA results.
 ### Available Insight Types
 | Type | Purpose | Data Required |
 |------|---------|---------------|
-| `zernike_wfe` | Mirror wavefront error | OP2 with displacements |
+| `zernike_dashboard` | **RECOMMENDED: Unified WFE dashboard** | OP2 with displacements |
+| `zernike_wfe` | WFE with Standard/OPD toggle | OP2 with displacements |
+| `zernike_opd_comparison` | Compare Standard vs OPD methods | OP2 with displacements |
 | `stress_field` | Von Mises stress contours | OP2 with stresses |
 | `modal` | Mode shapes + frequencies | OP2 with eigenvectors |
 | `thermal` | Temperature distribution | OP2 with temperatures |
 | `design_space` | Parameter-objective landscape | study.db with 5+ trials |
 
+### Zernike Method Comparison
+| Method | Use | RMS Difference |
+|--------|-----|----------------|
+| **Standard (Z-only)** | Quick analysis | Baseline |
+| **OPD (X,Y,Z)** ← RECOMMENDED | Any surface with lateral displacement | **+8-11% higher** (more accurate) |
+
 ### Commands
 ```bash
 # List available insights for a study