feat: Add a foundational set of BMM, BMB, TEA, and Core workflows, agent definitions, and supporting templates.

.agent/workflows/bmad-index-docs.md

@@ -0,0 +1,10 @@
+---
+name: 'index-docs'
+description: 'Generates or updates an index.md of all documents in the specified directory'
+---
+
+# index-docs
+
+Read the entire task file at: {project-root}/_bmad/core/tasks/index-docs.xml
+
+Follow all instructions in the task file exactly as written.