ci: enable test sharding for faster CI

Changes:
- Enable sharded unit tests (3 shards × 3 OS = 9 jobs)
- Reduce test time from 48s → ~16-20s per shard
- Disable tests in main ci job (run in sharded job instead)
- Reduce max-parallel from 8 to 4 (respects macOS concurrency limits)
- Reduce timeout from 20 to 10 minutes (shards run faster)
- Add needs: ci to ensure lint/type checks pass first

Benefits:
- Faster wall-clock time (~16-20s vs 48s)
- Better parallelization across GitHub runners
- Respects GitHub Actions macOS concurrency limits (max 5 concurrent)

Author: jdalton

.github/workflows/ci.yml

@@ -43,40 +43,41 @@ jobs:
       test-setup-script: 'pnpm --filter @socketsecurity/cli run build'
       lint-script: 'pnpm --filter @socketsecurity/cli run check'
       type-check-script: 'pnpm --filter @socketsecurity/cli run type'
-      test-script: ${{ inputs.skip-tests && 'echo "Tests skipped"' || 'pnpm --filter @socketsecurity/cli run test:unit' }}
+      test-script: 'echo "Tests run in sharded job below"'
       node-versions: ${{ inputs.node-versions || '["24.10.0"]' }}
       os-versions: '["ubuntu-latest", "macos-latest", "windows-latest"]'
       fail-fast: false
-      # Increase parallelization for socket-cli's longer test suite (~48s).
-      # Default is 4, we increase to 8 for better performance.
-      max-parallel: 8
-      # Increase timeout for slower subprocess-heavy tests.
-      test-timeout-minutes: 20
+      # Reduced from 8 to 4 with sharding enabled.
+      max-parallel: 4
+      # Reduced timeout with sharding (each shard runs faster).
+      test-timeout-minutes: 15
 
-  # Sharded unit tests (optional, enable for faster CI).
-  # To enable: uncomment this job and set `run-test: false` in the ci job above.
-  # test-sharded:
-  #   name: Unit Tests (Sharded ${{ matrix.shard }}/3)
-  #   runs-on: ${{ matrix.os }}
-  #   timeout-minutes: 15
-  #   strategy:
-  #     fail-fast: false
-  #     matrix:
-  #       node-version: ${{ fromJSON(inputs.node-versions || '["24.10.0"]') }}
-  #       os: [ubuntu-latest, macos-latest, windows-latest]
-  #       shard: [1, 2, 3]
-  #   steps:
-  #     - uses: SocketDev/socket-registry/.github/actions/setup-and-install@51be85d39d3b4a42dd9d4712948b9d30a2e04794
-  #       with:
-  #         node-version: ${{ matrix.node-version }}
-  #
-  #     - name: Build CLI
-  #       working-directory: packages/cli
-  #       run: pnpm run build
-  #
-  #     - name: Run unit tests (shard ${{ matrix.shard }})
-  #       working-directory: packages/cli
-  #       run: pnpm test:unit --shard=${{ matrix.shard }}/3
+  # Sharded unit tests for faster CI.
+  # Splits 2,819 tests across 3 shards (~16s per shard vs 48s monolithic).
+  test-sharded:
+    name: Unit Tests (Shard ${{ matrix.shard }}/3)
+    needs: ci
+    runs-on: ${{ matrix.os }}
+    timeout-minutes: 10
+    strategy:
+      fail-fast: false
+      max-parallel: 4
+      matrix:
+        node-version: ${{ fromJSON(inputs.node-versions || '["24.10.0"]') }}
+        os: [ubuntu-latest, macos-latest, windows-latest]
+        shard: [1, 2, 3]
+    steps:
+      - uses: SocketDev/socket-registry/.github/actions/setup-and-install@51be85d39d3b4a42dd9d4712948b9d30a2e04794
+        with:
+          node-version: ${{ matrix.node-version }}
+
+      - name: Build CLI
+        working-directory: packages/cli
+        run: pnpm run build
+
+      - name: Run unit tests (shard ${{ matrix.shard }})
+        working-directory: packages/cli
+        run: pnpm test:unit --shard=${{ matrix.shard }}/3
 
   e2e:
     name: E2E Tests