test(e2e): add npm pack + install -g verification

Simulates the setup-utoo / end-user flow:
1. Pack utoo binary into an npm tarball
2. npm install -g the tarball to a temp prefix
3. Verify the installed binary runs

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: elrrrrrrr

e2e/utoo-pm.ps1

@@ -224,4 +224,54 @@ finally {
     Remove-Item -Recurse -Force $optDepsDir -ErrorAction SilentlyContinue
 }
 
+# Case: Verify npm pack + npm install -g works (simulates setup-utoo flow)
+Write-Yellow "Case: npm pack and install -g utoo"
+$packDir = Join-Path $env:TEMP "utoo-e2e-pack-$(Get-Random)"
+$installPrefix = Join-Path $env:TEMP "utoo-e2e-prefix-$(Get-Random)"
+try {
+    New-Item -ItemType Directory -Path "$packDir\pkg\bin" -Force | Out-Null
+    New-Item -ItemType Directory -Path $installPrefix -Force | Out-Null
+
+    # Copy the actual built binary
+    $utooBin = (Get-Command utoo).Source
+    Copy-Item $utooBin "$packDir\pkg\bin\utoo.exe"
+
+    # Create package.json
+    @{
+        name = "utoo"
+        version = "0.0.0-e2e-test"
+        bin = @{ utoo = "bin/utoo"; ut = "bin/utoo" }
+        scripts = @{ postinstall = "echo postinstall-ok" }
+    } | ConvertTo-Json | Set-Content "$packDir\pkg\package.json"
+
+    # Pack
+    Push-Location "$packDir\pkg"
+    npm pack 2>&1
+    $tarball = Get-ChildItem "utoo-*.tgz" | Select-Object -First 1
+    Write-Host "Packed: $($tarball.Name)"
+
+    # Install globally to temp prefix
+    npm install -g $tarball.FullName "--prefix=$installPrefix" 2>&1
+    Write-Host "Installed to: $installPrefix"
+
+    # Verify the binary works
+    $installedUtoo = Join-Path $installPrefix "node_modules\utoo\bin\utoo.exe"
+    if (-not (Test-Path $installedUtoo)) {
+        $installedUtoo = Join-Path $installPrefix "utoo.exe"
+    }
+    if (-not (Test-Path $installedUtoo)) {
+        throw "utoo binary not found after npm install -g"
+    }
+
+    & $installedUtoo --version
+    if ($LASTEXITCODE -ne 0) { throw "utoo --version failed" }
+
+    Write-Green "PASS: npm pack + install -g works correctly"
+}
+finally {
+    Pop-Location
+    Remove-Item -Recurse -Force $packDir -ErrorAction SilentlyContinue
+    Remove-Item -Recurse -Force $installPrefix -ErrorAction SilentlyContinue
+}
+
 Write-Green "All e2e tests passed successfully!"

e2e/utoo-pm.sh

@@ -392,4 +392,58 @@ echo -e "${GREEN}PASS: optional dependencies with platform bindings work correct
 popd
 rm -rf "$OPTDEPS_DIR"
 
+# Case: Verify npm pack + npm install -g works (simulates setup-utoo flow)
+echo -e "${YELLOW}Case: npm pack and install -g utoo${NC}"
+PACK_DIR=$(mktemp -d)
+INSTALL_PREFIX=$(mktemp -d)
+REPO_ROOT=$(cd "$(dirname "$0")/.."; pwd)
+
+pushd "$PACK_DIR"
+
+# Build a utoo npm package using the vendor templates
+mkdir -p pkg/bin
+# Use the actual built binary from the e2e environment
+UTOO_BIN=$(which utoo)
+cp "$UTOO_BIN" pkg/bin/utoo
+chmod +x pkg/bin/utoo
+
+# Create package.json
+cat > pkg/package.json << 'PKGJSON'
+{
+  "name": "utoo",
+  "version": "0.0.0-e2e-test",
+  "bin": { "utoo": "bin/utoo", "ut": "bin/utoo" },
+  "scripts": { "postinstall": "echo postinstall-ok" }
+}
+PKGJSON
+
+# Pack it
+cd pkg
+npm pack 2>&1
+TARBALL=$(ls utoo-*.tgz)
+echo "Packed: $TARBALL"
+
+# Install globally to a temp prefix
+npm install -g "$TARBALL" --prefix="$INSTALL_PREFIX" 2>&1
+echo "Installed to: $INSTALL_PREFIX"
+
+# Verify the binary works
+INSTALLED_UTOO="$INSTALL_PREFIX/bin/utoo"
+if [ ! -f "$INSTALLED_UTOO" ]; then
+    # Try lib path on some systems
+    INSTALLED_UTOO="$INSTALL_PREFIX/lib/node_modules/utoo/bin/utoo"
+fi
+
+if [ ! -f "$INSTALLED_UTOO" ]; then
+    echo -e "${RED}FAIL: utoo binary not found after npm install -g${NC}"
+    ls -R "$INSTALL_PREFIX" 2>/dev/null | head -20
+    exit 1
+fi
+
+"$INSTALLED_UTOO" --version
+echo -e "${GREEN}PASS: npm pack + install -g works correctly${NC}"
+
+popd
+rm -rf "$PACK_DIR" "$INSTALL_PREFIX"
+
 echo -e "${GREEN}All e2e tests passed successfully!${NC}"