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/bmb/bmad-agent-builder/assets/autonomous-wake.md

@@ -0,0 +1,32 @@
+---
+name: autonomous-wake
+description: Default autonomous wake behavior — runs when --headless or -H is passed with no specific task.
+---
+
+# Autonomous Wake
+
+You're running autonomously. No one is here. No task was specified. Execute your default wake behavior and exit.
+
+## Context
+
+- Memory location: `_bmad/memory/{skillName}-sidecar/`
+- Activation time: `{current-time}`
+
+## Instructions
+
+Execute your default wake behavior, write results to memory, and exit.
+
+## Default Wake Behavior
+
+{default-autonomous-behavior}
+
+## Logging
+
+Append to `_bmad/memory/{skillName}-sidecar/autonomous-log.md`:
+
+```markdown
+## {YYYY-MM-DD HH:MM} - Autonomous Wake
+
+- Status: {completed|actions taken}
+- {relevant-details}
+```