build: add Windows desktop test bundle

.gitignore

@@ -2,6 +2,7 @@
 frontend/node_modules/
 frontend/dist/
 build/bin/verstak-desktop
+build/windows-amd64/
 smoke-platform
 plugins/
 vendor/

README.md

@@ -78,6 +78,30 @@ diagnostic logs:
 ./build/bin/verstak-desktop --debug
 ```
 
+## Windows test bundle from Linux
+
+The current Windows path is intended for manual testing, not publication. On a
+Linux host install MinGW, then run:
+
+```bash
+sudo apt install gcc-mingw-w64-x86-64
+./scripts/build-windows.sh
+```
+
+The script builds Windows amd64 plugin packages from the sibling
+`verstak-official-plugins` checkout, cross-compiles the Wails host, and writes
+a folder ready to copy to a Windows machine:
+
+```text
+build/windows-amd64/
+├── verstak-desktop.exe
+└── plugins/
+```
+
+Copy the whole directory to Windows and run `verstak-desktop.exe`. Windows
+requires the Microsoft WebView2 Runtime; Windows 11 normally includes it.
+No Windows GitHub Release is created by this command.
+
 ## First local vault
 
 1. Launch the desktop application and choose or create a writable vault folder.

scripts/build-windows.sh

@@ -0,0 +1,72 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT="$(cd "$(dirname "$0")/.." && pwd)"
+OFFICIAL_PLUGINS="${VERSTAK_OFFICIAL_PLUGINS_DIR:-$ROOT/../verstak-official-plugins}"
+WINDOWS_PLUGIN_DIST="${VERSTAK_WINDOWS_PLUGIN_DIST:-$OFFICIAL_PLUGINS/dist-windows}"
+WINDOWS_OUTPUT="${VERSTAK_WINDOWS_OUTPUT_DIR:-$ROOT/build/windows-amd64}"
+WINDOWS_CC="${VERSTAK_WINDOWS_CC:-x86_64-w64-mingw32-gcc}"
+
+if ! command -v "$WINDOWS_CC" >/dev/null; then
+  echo "Windows cross-compiler not found: $WINDOWS_CC" >&2
+  echo "Install x86_64-w64-mingw32-gcc (for example: sudo apt install gcc-mingw-w64-x86-64)." >&2
+  exit 1
+fi
+if [[ ! -d "$OFFICIAL_PLUGINS" ]]; then
+  echo "official plugins repository not found: $OFFICIAL_PLUGINS" >&2
+  exit 1
+fi
+
+WAILS="${WAILS_BIN:-}"
+if [[ -z "$WAILS" ]]; then
+  if command -v wails >/dev/null; then
+    WAILS="wails"
+  elif [[ -n "$(go env GOBIN 2>/dev/null)" && -x "$(go env GOBIN)/wails" ]]; then
+    WAILS="$(go env GOBIN)/wails"
+  elif [[ -x "$(go env GOPATH)/bin/wails" ]]; then
+    WAILS="$(go env GOPATH)/bin/wails"
+  fi
+fi
+if [[ -z "$WAILS" ]]; then
+  echo "Wails CLI is required. Install it with: go install github.com/wailsapp/wails/v2/cmd/wails@v2.12.0" >&2
+  exit 1
+fi
+
+cd "$ROOT"
+echo "=== verstak desktop Windows amd64 build ==="
+
+if [[ ! -d "$ROOT/frontend/node_modules" ]]; then
+  if [[ -f "$ROOT/frontend/package-lock.json" ]]; then
+    (cd "$ROOT/frontend" && npm ci --no-audit --no-fund)
+  else
+    (cd "$ROOT/frontend" && npm install --no-audit --no-fund)
+  fi
+fi
+(cd "$ROOT/frontend" && npm run build)
+
+go mod download
+go test -count=1 ./...
+
+"$OFFICIAL_PLUGINS/scripts/build-windows.sh"
+if [[ ! -d "$WINDOWS_PLUGIN_DIST" ]]; then
+  echo "Windows plugin packages were not produced: $WINDOWS_PLUGIN_DIST" >&2
+  exit 1
+fi
+
+# Wails generates Windows resources and invokes the supplied MinGW compiler.
+# -clean resets build/bin, so copy the finished executable only afterwards.
+"$WAILS" build -clean -platform windows/amd64 -compiler "$WINDOWS_CC" -o verstak-desktop.exe
+
+WINDOWS_BINARY="$ROOT/build/bin/verstak-desktop.exe"
+if [[ ! -f "$WINDOWS_BINARY" ]]; then
+  echo "Windows executable was not produced: $WINDOWS_BINARY" >&2
+  exit 1
+fi
+
+rm -rf "$WINDOWS_OUTPUT"
+mkdir -p "$WINDOWS_OUTPUT/plugins"
+cp "$WINDOWS_BINARY" "$WINDOWS_OUTPUT/verstak-desktop.exe"
+cp -R "$WINDOWS_PLUGIN_DIST/." "$WINDOWS_OUTPUT/plugins/"
+
+echo "Windows test bundle: $WINDOWS_OUTPUT"
+echo "Copy this directory to Windows and run verstak-desktop.exe."

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 desktop builder is missing or not executable: $BUILDER" >&2
+  exit 1
+fi
+
+bash -n "$BUILDER"
+grep -Fq -- '-platform windows/amd64' "$BUILDER"
+grep -Fq -- '-compiler "$WINDOWS_CC"' "$BUILDER"
+grep -Fq 'dist-windows' "$BUILDER"
+grep -Fq 'verstak-desktop.exe' "$BUILDER"
+grep -Fq 'x86_64-w64-mingw32-gcc' "$BUILDER"
+
+echo "Windows desktop build script contract passed"