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/workflows/2-plan-workflows/create-ux-design/ux-design-template.md

@@ -0,0 +1,13 @@
+---
+stepsCompleted: []
+inputDocuments: []
+---
+
+# UX Design Specification {{project_name}}
+
+**Author:** {{user_name}}
+**Date:** {{date}}
+
+---
+
+<!-- UX design content will be appended sequentially through collaborative workflow steps -->