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>

.claude/commands/bmad-bmm-quick-dev.md

@@ -0,0 +1,6 @@
+---
+name: 'quick-dev'
+description: 'Implement a Quick Tech Spec for small changes or features. Use when the user provides a quick tech spec and says ""implement this quick spec"" or ""proceed with implementation of [quick tech spec]""'
+---
+
+IT IS CRITICAL THAT YOU FOLLOW THIS COMMAND: LOAD the FULL @{project-root}/_bmad/bmm/workflows/bmad-quick-flow/quick-dev/workflow.md, READ its entire contents and follow its directions exactly!