feat: Add comprehensive BMAD agent, workflow, and documentation framework.

_bmad/bmb/README.md

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+# BMB - BMad Builder Module
+
+Specialized tools and workflows for creating, customizing, and extending BMad components including agents, workflows, and complete modules.
+
+## Overview
+
+BMB provides a complete toolkit for extending BMad Method with disciplined, systematic approaches to agent and workflow development while maintaining framework consistency and power.
+
+**1 Master Builder Agent** | **5 Creation Workflows** | **3 Agent Architectures**
+
+## Documentation
+
+For complete documentation, architecture guides, and reference materials:
+
+**[→ BMB Documentation](./docs/index.md)**
+
+## Quick Links
+
+- [Agent Creation Guide](./docs/agents/index.md) - Build custom agents
+- [Workflow Architecture](./docs/workflows/index.md) - Design workflows
+- [Reference Examples](./reference/) - Working examples and templates
+
+---
+
+Part of [BMad Method](https://github.com/bmadcode/bmad-method) v6.0