fix: address CodeRabbit review feedback

- Separate local declaration from assignment to avoid masking errors (SC2155)
- Add exit code check after Homebrew installer execution
- Add exit code check after NodeSource setup script execution
- Add LASTEXITCODE check after Chocolatey installer execution

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

scripts/install-core.sh

@@ -99,11 +99,12 @@ check_not_symlink() {
 
 # Try to download pre-built binary with integrity verification
 download_binary() {
-    local os=$(detect_os)
-    local arch=$(detect_arch)
-    local binary_name="core-${os}-${arch}"
-    local binary_url="https://github.com/$REPO/releases/download/$VERSION/${binary_name}"
-    local checksum_url="https://github.com/$REPO/releases/download/$VERSION/checksums.txt"
+    local os arch binary_name binary_url checksum_url
+    os=$(detect_os)
+    arch=$(detect_arch)
+    binary_name="core-${os}-${arch}"
+    binary_url="https://github.com/$REPO/releases/download/$VERSION/${binary_name}"
+    checksum_url="https://github.com/$REPO/releases/download/$VERSION/checksums.txt"
 
     if [[ "$os" == "windows" ]]; then
         binary_name="${binary_name}.exe"

scripts/install-deps.ps1

@@ -40,6 +40,9 @@ function Install-Chocolatey {
 
         Write-Info "Executing Chocolatey installer..."
         & $tempScript
+        if ($LASTEXITCODE -ne 0) {
+            Write-Err "Chocolatey installation failed with exit code $LASTEXITCODE"
+        }
     } finally {
         # Clean up temp file
         if (Test-Path $tempScript) {

scripts/install-deps.sh

@@ -88,7 +88,10 @@ install_brew() {
         error "Failed to download Homebrew installer"
     }
 
-    /bin/bash "$temp_script"
+    /bin/bash "$temp_script" || {
+        rm -f "$temp_script"
+        error "Homebrew installation failed"
+    }
     rm -f "$temp_script"
 
     # Add to PATH for this session
@@ -232,7 +235,10 @@ setup_linux_apt() {
             error "Failed to download NodeSource setup script"
         }
 
-        sudo -E bash "$temp_script"
+        sudo -E bash "$temp_script" || {
+            rm -f "$temp_script"
+            error "NodeSource setup failed"
+        }
         rm -f "$temp_script"
         sudo apt-get install -y nodejs
     fi