fix: ChatBubble crash and DeepSeek API compatibility

- Fix ChatBubble to handle non-string content with String() wrapper
- Fix API route to use generateText for non-streaming requests
- Add @ai-sdk/openai-compatible for non-OpenAI providers (DeepSeek, etc.)
- Use Chat Completions API instead of Responses API for compatible providers
- Update ChatBubble tests and fix component exports to kebab-case
- Remove stale PascalCase ChatBubble.tsx file

_bmad/bmb/README.md

@@ -0,0 +1,25 @@
+# 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