Initial commit: Converge portfolio rationalization app

Next.js app for mapping a customer's competitive tool landscape onto our
portfolio and building the consolidation business case: assessment
workbench, customer report and Word export, product catalog, competitive
knowledge base, dossier import, shareable landscape questionnaires with a
review inbox, tool-footprint and business-unit value analysis, and an
implementation timeline.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/app/icon.svg

@@ -0,0 +1,13 @@
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+  <!-- Favicon: the nav logo simplified for 16px — no trend line, heavier bars. -->
+  <defs>
+    <linearGradient id="g" x1="0" y1="32" x2="32" y2="0" gradientUnits="userSpaceOnUse">
+      <stop stop-color="#2a78d6"/>
+      <stop offset="1" stop-color="#1baf7a"/>
+    </linearGradient>
+  </defs>
+  <rect width="32" height="32" rx="7" fill="url(#g)"/>
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+</svg>