Remove executive stats cards from homepage

Author: Sean Kibbee

docs/index.html

@@ -109,44 +109,6 @@ <h2>How This PoC Enables DTB And Health Canada With AI</h2>
         </p>
       </div>
 
-      <div class="exec-grid">
-        <article class="card exec-card">
-          <h3>Productivity Signal</h3>
-          <p class="exec-stat">Up to 55% faster task completion</p>
-          <p>
-            In a controlled GitHub study, developers using Copilot completed a coding task significantly faster than a
-            non-Copilot group.
-          </p>
-          <a href="https://github.blog/news-insights/research/research-quantifying-github-copilots-impact-on-developer-productivity-and-happiness/"
-            >Source: GitHub Research (updated 2024)</a
-          >
-        </article>
-
-        <article class="card exec-card">
-          <h3>Enterprise Adoption Signal</h3>
-          <p class="exec-stat">61.8% using AI now; 76% using or planning</p>
-          <p>
-            Stack Overflow's 2024 survey indicates broad developer adoption and intent, suggesting AI tooling is becoming
-            standard in modern engineering workflows.
-          </p>
-          <a href="https://survey.stackoverflow.co/2024/ai"
-            >Source: Stack Overflow Developer Survey 2024</a
-          >
-        </article>
-
-        <article class="card exec-card">
-          <h3>Time Savings Range</h3>
-          <p class="exec-stat">~50% faster on some common tasks</p>
-          <p>
-            McKinsey reports major speed gains for documenting, writing, and refactoring code, with variation by task
-            complexity and developer experience.
-          </p>
-          <a href="https://www.mckinsey.com/capabilities/mckinsey-digital/our-insights/unleashing-developer-productivity-with-generative-ai"
-            >Source: McKinsey Digital</a
-          >
-        </article>
-      </div>
-
       <article class="card exec-principles">
         <h3>What We Are Enabling At Health Canada</h3>
         <ul class="clean-list">
@@ -161,10 +123,6 @@ <h3>What We Are Enabling At Health Canada</h3>
         </p>
       </article>
 
-      <p class="citation-note">
-        Note: External stats are directional benchmarks from published studies; realized gains depend on task type,
-        implementation maturity, and governance quality.
-      </p>
     </section>
 
     <section class="layout cards-section">