docs: start roadmap with code and process assessment

research/ai-adoption/strategy-model.json

@@ -61,7 +61,7 @@
     {
       "id": "roadmap",
       "title": "Roadmap",
-      "purpose": "Evidence-gated phases, no promised dates or budgets."
+      "purpose": "Assess current code quality and delivery processes, close critical gaps, then pilot, expand and sustain AI adoption."
     }
   ],
   "diagram": {