Fix coverage: run vitest per-package, merge lcov reports with path prefixes

Running vitest from the workspace root with --coverage.enabled doesn't
properly apply per-package globals config. Switch to per-package vitest
runs using pnpm --filter, merge lcov reports with corrected paths, and
install the coverage provider before tests to avoid node_modules issues.

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

Author: davehenton

.github/workflows/ci.yml

@@ -36,19 +36,28 @@ jobs:
       - uses: pnpm/action-setup@v5
         with:
           run_install: true
-      - run: pnpm test
       - name: Install coverage provider
         if: matrix.node-version == 22
         run: pnpm add -Dw @vitest/coverage-v8
+      - run: pnpm test
       - name: Generate coverage
         if: matrix.node-version == 22
-        run: pnpm exec vitest run --coverage.enabled --coverage.reporter=lcov
+        run: |
+          pnpm --filter openapi-fetch exec vitest run --coverage.enabled --coverage.reporter=lcov
+          pnpm --filter openapi-typescript exec vitest run --coverage.enabled --coverage.reporter=lcov
+          pnpm --filter openapi-react-query exec vitest run --coverage.enabled --coverage.reporter=lcov
+      - name: Merge coverage reports
+        if: matrix.node-version == 22
+        run: |
+          sed 's|^SF:|SF:packages/openapi-fetch/|' packages/openapi-fetch/coverage/lcov.info > coverage-merged.info
+          sed 's|^SF:|SF:packages/openapi-typescript/|' packages/openapi-typescript/coverage/lcov.info >> coverage-merged.info
+          sed 's|^SF:|SF:packages/openapi-react-query/|' packages/openapi-react-query/coverage/lcov.info >> coverage-merged.info
       - name: Upload coverage to Qlty
         if: matrix.node-version == 22
         uses: qltysh/qlty-action/coverage@v2
         with:
           token: ${{ secrets.QLTY_COVERAGE_TOKEN }}
-          files: coverage/lcov.info
+          files: coverage-merged.info
   test-e2e:
     runs-on: ubuntu-latest
     steps: