Quote coverage filename to fix PowerShell parsing

PowerShell requires quotes around filenames with dots. Changed
-coverprofile=coverage.out to -coverprofile="coverage.out"

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

Author: hegner123

.github/workflows/test.yml

@@ -25,8 +25,7 @@ jobs:
         go-version: ${{ matrix.go-version }}
 
     - name: Run tests
-      shell: bash
-      run: go test -v -race -coverprofile=coverage.out -covermode=atomic
+      run: go test -v -race -coverprofile="coverage.out" -covermode=atomic
 
     - name: Upload coverage to Codecov
       if: matrix.os == 'ubuntu-latest' && matrix.go-version == '1.23'