Move Validation after Methodology in nav

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

Author: KI7MT

mkdocs.yml

@@ -55,6 +55,12 @@ nav:
     - Signatures: methodology/step_f_signatures.md
     - Training: methodology/training.md
     - "Coverage & Confidence": methodology/coverage.md
+  - Validation:
+    - Overview: validation/index.md
+    - Link Budget Battery: validation/v20_link_budget_battery.md
+    - "IONIS vs VOACAP": validation/step_i_voacap_comparison.md
+    - Prediction Quality: validation/step_k_quality_test.md
+    - Test Specification: validation/v12_test_specification.md
   - Pipeline Apps:
     - Overview: tools/index.md
     - WSPR Ingestion: tools/wspr.md
@@ -68,12 +74,6 @@ nav:
     - Hardware Requirements: devops/index.md
     - Pipeline Runbook: devops/pipeline-runbook.md
     - "Operations & Maintenance": devops/maintenance.md
-  - Validation:
-    - Overview: validation/index.md
-    - Link Budget Battery: validation/v20_link_budget_battery.md
-    - "IONIS vs VOACAP": validation/step_i_voacap_comparison.md
-    - Prediction Quality: validation/step_k_quality_test.md
-    - Test Specification: validation/v12_test_specification.md
   - UserGuide:
     - Getting Started: userguide/index.md
     - Running Predictions: userguide/predictions.md