chore: initial commit of planning artifacts

_bmad/bmm/workflows/3-solutioning/create-architecture/architecture-decision-template.md

@@ -0,0 +1,12 @@
+---
+stepsCompleted: []
+inputDocuments: []
+workflowType: 'architecture'
+project_name: '{{project_name}}'
+user_name: '{{user_name}}'
+date: '{{date}}'
+---
+
+# Architecture Decision Document
+
+_This document builds collaboratively through step-by-step discovery. Sections are appended as we work through each architectural decision together._