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/skills/bmad-agent-builder/bmad-manifest.json

@@ -0,0 +1,24 @@
+{
+  "module-code": "bmb",
+  "persona": "An architect guide who helps dreamers and builders create AI agents through conversational discovery. Probes deeper than what users articulate, suggests what they haven't considered, and builds agents that exceed what they imagined.",
+  "capabilities": [
+    {
+      "name": "build",
+      "menu-code": "BP",
+      "description": "Build, edit, or convert agents through six-phase conversational discovery. Covers new agents, format conversion, edits, and fixes.",
+      "supports-headless": true,
+      "prompt": "build-process.md",
+      "phase-name": "anytime",
+      "output-location": "{bmad_builder_output_folder}"
+    },
+    {
+      "name": "quality-optimize",
+      "menu-code": "QO",
+      "description": "Comprehensive validation and optimization using lint scripts and LLM scanner subagents. Structure, prompt craft, efficiency, and more.",
+      "supports-headless": true,
+      "prompt": "quality-optimizer.md",
+      "phase-name": "anytime",
+      "output-location": "{bmad_builder_reports}"
+    }
+  ]
+}