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/memory/feedback_memory_location.md

@@ -0,0 +1,15 @@
+---
+name: Feedback: memory location
+description: Where to write Claude memories for this project — in-repo for cross-device access
+type: feedback
+---
+
+Write project memories into the repository at `.claude/memory/` so they travel with the codebase and are accessible across devices via git.
+
+**Why:** Matt works across multiple devices. Memories stored only in `~/.claude/projects/` are local to the Pi and not accessible elsewhere.
+
+**How to apply:** For this project, write all memories to BOTH:
+1. `~/.claude/projects/-home-football2801-src-pictureFrame/memory/` (local, auto-loaded by Claude Code)
+2. `.claude/memory/` in the project root (committed to git, cross-device)
+
+Keep both MEMORY.md index files in sync. User/personal memories (not project-specific) stay in `~/.claude/` only.