🗑️ Remove redundant Cognitive Validity Score card

The cognitive validity information is already displayed in the comprehensive
Cognitive Validity Benchmarks section with detailed breakdown by memory phenomenon.
Removed duplicate card to reduce dashboard clutter and improve focus on unique metrics.

Author: raold

static/dashboard.html

@@ -1408,19 +1408,6 @@ <h3>Hypothesis Success Rate</h3>
                 </div>
             </div>
 
-            <div class="metric-card">
-                <div class="icon"><i class="fas fa-brain"></i></div>
-                <h3>Cognitive Validity Score</h3>
-                <div class="metric-value warning" id="cognitiveValidity">72%</div>
-                <div class="metric-target">Target: >85%</div>
-                <div class="progress-bar">
-                    <div class="progress-fill warning" style="width: 72%" id="cognitiveProgress"></div>
-                </div>
-                <div class="status-indicator warning">
-                    <i class="fas fa-arrow-trend-up"></i> Improving
-                </div>
-            </div>
-
             <div class="metric-card">
                 <div class="icon"><i class="fas fa-rocket"></i></div>
                 <h3>Research Velocity</h3>