Add KiCad PCBnew WASM test infrastructure

- Add pcbnew-load.spec.ts: Tests for WASM runtime initialization
- Add pcbnew.html: Test harness for loading KiCad in browser
- Add setup-kicad-wasm.sh: Script to copy WASM from Docker build
- Add serve.json: COOP/COEP headers for SharedArrayBuffer support
- Update package.json: Add npm run test:kicad and setup:kicad scripts
- Update .gitignore: Exclude generated WASM/JS files from kicad/

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

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

tests/scripts/setup-kicad-wasm.sh

@@ -0,0 +1,27 @@
+#!/bin/bash
+# Copies KiCad WASM build output from Docker volume to test directory
+
+set -e
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+PROJECT_ROOT="$(cd "$SCRIPT_DIR/../.." && pwd)"
+KICAD_TEST="$PROJECT_ROOT/tests/wasm-app/kicad"
+
+mkdir -p "$KICAD_TEST"
+
+echo "Copying KiCad WASM files from Docker build..."
+docker compose -f "$PROJECT_ROOT/docker/docker-compose.yml" cp \
+  kicad-wasm-builder:/workspace/build-wasm/kicad-pcbnew/pcbnew/pcbnew.js "$KICAD_TEST/"
+docker compose -f "$PROJECT_ROOT/docker/docker-compose.yml" cp \
+  kicad-wasm-builder:/workspace/build-wasm/kicad-pcbnew/pcbnew/pcbnew.wasm "$KICAD_TEST/"
+
+# Worker file for pthreads (if exists)
+docker compose -f "$PROJECT_ROOT/docker/docker-compose.yml" cp \
+  kicad-wasm-builder:/workspace/build-wasm/kicad-pcbnew/pcbnew/pcbnew.worker.js "$KICAD_TEST/" 2>/dev/null || true
+
+# wxWidgets WASM JavaScript glue code (defines JS functions called from WASM)
+echo "Copying wxWidgets WASM glue code..."
+cp "$PROJECT_ROOT/wxwidgets/build/wasm/wx.js" "$KICAD_TEST/"
+
+echo "KiCad WASM files copied to $KICAD_TEST"
+ls -lh "$KICAD_TEST"