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

_bmad/bmm/data/project-context-template.md

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+# Project Brainstorming Context Template
+
+## Project Focus Areas
+
+This brainstorming session focuses on software and product development considerations:
+
+### Key Exploration Areas
+
+- **User Problems and Pain Points** - What challenges do users face?
+- **Feature Ideas and Capabilities** - What could the product do?
+- **Technical Approaches** - How might we build it?
+- **User Experience** - How will users interact with it?
+- **Business Model and Value** - How does it create value?
+- **Market Differentiation** - What makes it unique?
+- **Technical Risks and Challenges** - What could go wrong?
+- **Success Metrics** - How will we measure success?
+
+### Integration with Project Workflow
+
+Brainstorming results might feed into:
+
+- Product Briefs for initial product vision
+- PRDs for detailed requirements
+- Technical Specifications for architecture plans
+- Research Activities for validation needs
+