Revert "fix: use venv instead of --system for TB workflow"

This reverts commit bce155f36b.

.github/workflows/terminal-bench-regression.yml

@@ -27,11 +27,8 @@ jobs:
       - name: Setup Python + uv
         uses: astral-sh/setup-uv@v6
 
-      - name: Create venv and install deps
-        run: |
-          uv venv .venv
-          source .venv/bin/activate
-          uv pip install "harbor>=0.1.45" "litellm>=1.0.0"
+      - name: Install Harbor
+        run: uv pip install --system "harbor>=0.1.45" "litellm>=1.0.0"
 
       - name: Configure Modal
         env:
@@ -47,8 +44,6 @@ jobs:
           ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}
           OPENAI_API_KEY: ${{ secrets.OPENAI_API_KEY }}
         run: |
-          source .venv/bin/activate
-
           # Build --task-name flags from regression-tasks.txt
           TASK_FLAGS=""
           while IFS= read -r task; do
@@ -98,7 +93,7 @@ jobs:
           GITHUB_RUN_ID: ${{ github.run_id }}
           GITHUB_SERVER_URL: ${{ github.server_url }}
         run: |
-          uv run python benchmarks/terminal_bench/report.py \
+          python benchmarks/terminal_bench/report.py \
             --results-dir results/ \
             --baseline benchmarks/terminal_bench/baseline.json \
             --repo "${{ github.repository }}"