eeschema simulator: lazy ngspice_service worker — static sharedspice (XSPICE registry + CIDER), init_dll ifdef, e2e both engines

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

scripts/kicad/build-ngspice_service.sh

@@ -0,0 +1,60 @@
+#!/bin/bash
+# Build ngspice_service.{js,wasm} — the eeschema simulator's ngspice worker
+# module (wasm/ngspice-service/). Unlike occ_service this does NOT go through
+# the kicad CMake tree: the module contains no KiCad/wx code, so it configures
+# standalone against the sysroot ngspice artifacts (much faster to iterate,
+# and buildable without the full editor dependency set).
+#
+# Artifacts: ${BUILD_ROOT}/kicad-ngspice_service/ngspice_service/ngspice_service.{js,wasm}
+# — the kicad-<app>/<subdir>/ layout every other app uses, so docker/build.sh's
+# output copy and tests/scripts/setup-kicad-wasm.sh's docker-volume fallback
+# find them without special-casing.
+
+set -e
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+source "${SCRIPT_DIR}/../common/env.sh"
+
+# Parse arguments
+CLEAN=0
+for arg in "$@"; do
+    case $arg in
+        --clean)
+            CLEAN=1
+            shift
+            ;;
+    esac
+done
+
+NGSPICE_SERVICE_BUILD="${BUILD_ROOT}/kicad-ngspice_service"
+
+if [ $CLEAN -eq 1 ]; then
+    log_info "Cleaning ngspice_service build..."
+    rm -rf "${NGSPICE_SERVICE_BUILD}"
+fi
+
+# The ngspice dep (sharedspice static lib + code-model archives + spinit) is
+# stamped, so this is a no-op when already built.
+"${SCRIPT_DIR}/../deps/build-ngspice.sh"
+
+log_info "Building ngspice_service..."
+
+mkdir -p "${NGSPICE_SERVICE_BUILD}"
+cd "${NGSPICE_SERVICE_BUILD}"
+
+emcmake cmake "${WASM_COMPAT}/ngspice-service" \
+    -DCMAKE_BUILD_TYPE=Release \
+    -DCMAKE_RUNTIME_OUTPUT_DIRECTORY="${NGSPICE_SERVICE_BUILD}/ngspice_service" \
+    -DNGSPICE_SYSROOT="${SYSROOT}" \
+    -DNGSPICE_EH_FLAGS="${DEPS_EH_FLAGS}"
+
+emmake make -j${JOBS}
+
+for f in ngspice_service.js ngspice_service.wasm; do
+    if [ ! -f "${NGSPICE_SERVICE_BUILD}/ngspice_service/$f" ]; then
+        log_error "ngspice_service build incomplete: missing $f"
+        exit 1
+    fi
+done
+
+log_info "ngspice_service build complete: ${NGSPICE_SERVICE_BUILD}/ngspice_service/ngspice_service.{js,wasm}"