feat: initial commit — BMAD tooling, Claude memories, firmware scaffold

Adds the complete project foundation:
- BMAD BMM workflow tooling (_bmad/)
- Claude slash commands, skills, and project memories (.claude/)
- ESP32 firmware scaffold (PlatformIO + Waveshare e-ink driver)
- .gitignore excluding _bmad-output/ and .pio/ build artifacts

Planning artifacts (PRD, architecture, epics) are intentionally not
tracked — they live in _bmad-output/ per project convention.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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

@@ -0,0 +1,26 @@
+# 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
+