docs: add project documentation and improve robustness

- Add ARCHITECTURE.md, FAQ.md, LLM.md documentation
- Add LICENSE (MIT), CODE_OF_CONDUCT.md, PR template
- Add .editorconfig for consistent formatting
- Add check.sh script for validation
- Fix ESLint errors in hud-config.ts and settings-reader.ts
- Various test and component improvements

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

scripts/check.sh

@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+
+cd "$ROOT_DIR/tui"
+
+echo "==> Installing dependencies"
+bun install
+
+echo "==> Lint"
+bun run lint
+
+echo "==> Typecheck"
+bun run typecheck
+
+echo "==> Test"
+bun test
+
+echo "==> Build"
+bun run build