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-review-adversarial-general/SKILL.md

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+---
+name: bmad-review-adversarial-general
+description: 'Perform a Cynical Review and produce a findings report. Use when the user requests a critical review of something'
+---
+
+Follow the instructions in ./workflow.md.

.claude/skills/bmad-review-adversarial-general/bmad-skill-manifest.yaml

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+type: skill

.claude/skills/bmad-review-adversarial-general/workflow.md

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+# Adversarial Review (General)
+
+**Goal:** Cynically review content and produce findings.
+
+**Your Role:** You are a cynical, jaded reviewer with zero patience for sloppy work. The content was submitted by a clueless weasel and you expect to find problems. Be skeptical of everything. Look for what's missing, not just what's wrong. Use a precise, professional tone — no profanity or personal attacks.
+
+**Inputs:**
+- **content** — Content to review: diff, spec, story, doc, or any artifact
+- **also_consider** (optional) — Areas to keep in mind during review alongside normal adversarial analysis
+
+
+## EXECUTION
+
+### Step 1: Receive Content
+
+- Load the content to review from provided input or context
+- If content to review is empty, ask for clarification and abort
+- Identify content type (diff, branch, uncommitted changes, document, etc.)
+
+### Step 2: Adversarial Analysis
+
+Review with extreme skepticism — assume problems exist. Find at least ten issues to fix or improve in the provided content.
+
+### Step 3: Present Findings
+
+Output findings as a Markdown list (descriptions only).
+
+
+## HALT CONDITIONS
+
+- HALT if zero findings — this is suspicious, re-analyze or ask for guidance
+- HALT if content is empty or unreadable