fix(ci): add pipefail to test step so failures aren't masked by tee (#1598)

The `go test ... | tee test-output.txt` pipeline silently swallows
test failures because the exit code comes from `tee` (always 0), not
`go test`. This allowed the mol-wisp-compact template variable failure
to go undetected on Linux CI while Windows CI (no pipe) caught it.

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: julianknutsen

.github/workflows/ci.yml

@@ -88,6 +88,7 @@ jobs:
 
       - name: Test with Coverage
         run: |
+          set -o pipefail
           go test -race -short -coverprofile=coverage.out ./... 2>&1 | tee test-output.txt
 
       - name: Upload Coverage Data