Add Executive Summary section with 5 key KPIs

- Calculate operating margin (lifecycle profit / revenue)
- Show color-coded status badge (Profitable/Healthy/Break-even/Loss)
- Display 5 KPI metrics: Monthly Lease, Operating Margin, Manufacturing Cost, Recovery Rate, Max Cycles
- Add contextual insight message based on model status
- Section visible in all stakeholder views

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

app.py

@@ -200,6 +200,22 @@ total_lease_cost = lease_price * lease_term
 refurb_a = int(avg_refurb_cost * 0.4)
 refurb_b = int(avg_refurb_cost * 1.8)
 
+# Executive Summary calculations
+lifecycle_revenue = max_cycles * revenue_per_customer
+lifecycle_cost = new_unit_cost + (max_cycles - 1) * refurb_unit_cost
+lifecycle_profit = lifecycle_revenue - lifecycle_cost
+operating_margin = (lifecycle_profit / lifecycle_revenue) * 100 if lifecycle_revenue > 0 else 0
+
+# Model status thresholds
+if operating_margin >= 30:
+    model_status, status_color = "Profitable", "#2ecc71"
+elif operating_margin >= 15:
+    model_status, status_color = "Healthy", "#f1c40f"
+elif operating_margin >= 0:
+    model_status, status_color = "Break-even", "#e67e22"
+else:
+    model_status, status_color = "Loss", "#e74c3c"
+
 # ============================================================
 # SHARED PRODUCT HEADER (compact)
 # ============================================================
@@ -215,6 +231,45 @@ with header_col2:
 
 st.markdown("---")
 
+# ============================================================
+# EXECUTIVE SUMMARY (visible in all views)
+# ============================================================
+st.markdown("**Executive Summary**")
+
+# Model Status Badge
+st.markdown(f'''
+<span style="background-color: {status_color}; color: white; padding: 0.3rem 0.8rem;
+border-radius: 20px; font-weight: 600; font-size: 0.85rem;">
+Model: {model_status}</span>
+<span style="color: #888; margin-left: 1rem; font-size: 0.85rem;">
+{operating_margin:.1f}% margin across {max_cycles} cycles</span>
+''', unsafe_allow_html=True)
+
+# 5 KPI Metrics Row
+kpi_cols = st.columns(5)
+with kpi_cols[0]:
+    st.metric("A: Monthly Lease", f"€{lease_price}", help="Revenue driver")
+with kpi_cols[1]:
+    st.metric("B: Operating Margin", f"{operating_margin:.1f}%",
+              delta="healthy" if operating_margin >= 25 else "tight",
+              help="Lifecycle profit / revenue")
+with kpi_cols[2]:
+    st.metric("C: Manufacturing", f"€{mfg_cost}", help="First-cycle cost")
+with kpi_cols[3]:
+    st.metric("D: Recovery Rate", f"{eolrr:.1%}", help="Enables reuse cycles")
+with kpi_cols[4]:
+    st.metric("E: Max Cycles", f"{max_cycles}", help="Families per product")
+
+# Contextual insight based on status
+if model_status == "Loss":
+    st.error("Action needed: Raise lease price, reduce costs, or increase cycles.")
+elif model_status == "Break-even":
+    st.warning(f"Margin thin at {operating_margin:.1f}%. Review pricing or costs.")
+else:
+    st.success(f"Strong: {operating_margin:.1f}% margin, {eolrr:.0%} recovery, {max_cycles} cycles.")
+
+st.markdown("---")
+
 # ============================================================
 # VIEW: STRATEGY (C-Level)
 # ============================================================