ci: prune macOS coverage artifacts

.github/workflows/tests-rs-workspace.yml

@@ -21,14 +21,27 @@ jobs:
         with:
           clean: false
 
-      - name: Clean target if too large
+      - name: Prune macOS runner disk before tests
         run: |
-          SIZE=$(du -sm target 2>/dev/null | cut -f1 || true)
+          for path in ../target-backup-before-*-clean-* target/llvm-cov-target; do
+            if [ -e "$path" ]; then
+              echo "Removing stale runner artifact: $path"
+              rm -rf "$path"
+            fi
+          done
+
+          TARGET_MAX_MB=120000
+          MIN_FREE_MB=60000
+          SIZE=$(du -sm target 2>/dev/null | awk '{print $1}' || echo 0)
+          FREE=$(df -m . | awk 'NR == 2 {print $4}')
           SIZE=${SIZE:-0}
+          FREE=${FREE:-0}
+
           echo "target/ size: ${SIZE}MB"
-          if [ "$SIZE" -gt 200000 ]; then
-            echo "target/ exceeds 200GB — cleaning"
-            cargo clean
+          echo "available disk: ${FREE}MB"
+          if [ "$SIZE" -gt "$TARGET_MAX_MB" ] || [ "$FREE" -lt "$MIN_FREE_MB" ]; then
+            echo "target/ exceeds ${TARGET_MAX_MB}MB or disk is below ${MIN_FREE_MB}MB free; removing target/"
+            rm -rf target
           fi
 
       - name: Install build dependencies
@@ -212,6 +225,15 @@ jobs:
           token: ${{ secrets.CODECOV_TOKEN }}
           fail_ci_if_error: false
 
+      - name: Remove cargo-llvm-cov build artifacts
+        if: always()
+        run: |
+          if [ -d target/llvm-cov-target ]; then
+            du -sh target/llvm-cov-target || true
+            rm -rf target/llvm-cov-target
+          fi
+          du -sh target 2>/dev/null || true
+
       - name: Run doctests
         if: ${{ inputs.doctests-changed }}
         run: |
@@ -530,4 +552,3 @@ jobs:
             fi
           done
           echo "No immutable/append_only structure violations found"
-