build: add Windows plugin packages

.gitignore

@@ -1,4 +1,5 @@
 dist/
+dist-windows/
 release/
 node_modules/
 # compiled backend binaries (built from source)

README.md

@@ -28,6 +28,20 @@ cd ../verstak-desktop
 ./scripts/install-dev-plugins.sh
 ```
 
+## Windows test packages from Linux
+
+Install a MinGW cross-compiler, then build a separate Windows amd64 package
+tree:
+
+```bash
+sudo apt install gcc-mingw-w64-x86-64
+./scripts/build-windows.sh
+```
+
+The result is `dist-windows/`. Go sidecars, when a plugin has one, are emitted
+as `backend/<plugin-id>.exe`; frontends and manifests are the same packaged
+files used on Linux. This is a local test output and is not a GitHub Release.
+
 ## Alpha behaviour
 
 - Browser Inbox archives processed captures and can restore them; permanent

scripts/build-windows.sh

@@ -0,0 +1,52 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT="$(cd "$(dirname "$0")/.." && pwd)"
+WINDOWS_DIST="${VERSTAK_WINDOWS_PLUGIN_DIST:-$ROOT/dist-windows}"
+WINDOWS_CC="${VERSTAK_WINDOWS_CC:-x86_64-w64-mingw32-gcc}"
+GO_BIN="${GO_BIN:-go}"
+
+if ! command -v "$WINDOWS_CC" >/dev/null; then
+  echo "Windows cross-compiler not found: $WINDOWS_CC" >&2
+  echo "Install x86_64-w64-mingw32-gcc (for example: sudo apt install gcc-mingw-w64-x86-64)." >&2
+  exit 1
+fi
+if ! command -v "$GO_BIN" >/dev/null; then
+  echo "go is required to build Windows plugin backends" >&2
+  exit 1
+fi
+
+cd "$ROOT"
+echo "=== verstak official plugins Windows amd64 build ==="
+
+# Reuse the canonical frontend and manifest packager, then replace every Go
+# sidecar with its Windows executable in a separate dist-windows tree.
+./scripts/build.sh
+rm -rf "$WINDOWS_DIST"
+mkdir -p "$WINDOWS_DIST"
+cp -R "$ROOT/dist/." "$WINDOWS_DIST/"
+
+backend_count=0
+for plugin_dir in "$ROOT"/plugins/*/; do
+  [[ -d "$plugin_dir" ]] || continue
+  plugin_name="$(basename "$plugin_dir")"
+  backend_dir="$plugin_dir/backend"
+  [[ -d "$backend_dir" ]] || continue
+  if [[ ! -f "$backend_dir/go.mod" && ! -f "$backend_dir/main.go" ]]; then
+    continue
+  fi
+
+  package_backend="$WINDOWS_DIST/$plugin_name/backend"
+  rm -rf "$package_backend"
+  mkdir -p "$package_backend"
+  echo "  → Windows backend: $plugin_name.exe"
+  (
+    cd "$backend_dir"
+    GOOS=windows GOARCH=amd64 CGO_ENABLED=1 CC="$WINDOWS_CC" \
+      "$GO_BIN" build -o "$package_backend/$plugin_name.exe" .
+  )
+  backend_count=$((backend_count + 1))
+done
+
+echo "Windows plugin packages: $WINDOWS_DIST"
+echo "Windows backends built: $backend_count"

scripts/test-build-windows.sh

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT="$(cd "$(dirname "$0")/.." && pwd)"
+BUILDER="$ROOT/scripts/build-windows.sh"
+
+if [[ ! -x "$BUILDER" ]]; then
+  echo "Windows plugin builder is missing or not executable: $BUILDER" >&2
+  exit 1
+fi
+
+bash -n "$BUILDER"
+grep -Fq 'GOOS=windows' "$BUILDER"
+grep -Fq 'GOARCH=amd64' "$BUILDER"
+grep -Fq 'dist-windows' "$BUILDER"
+grep -Fq '.exe' "$BUILDER"
+grep -Fq 'x86_64-w64-mingw32-gcc' "$BUILDER"
+
+echo "Windows plugin build script contract passed"