diff --git a/.archon/workflows/dev-pipeline.yaml b/.archon/workflows/dev-pipeline.yaml
index 52c5062..607ddef 100644
--- a/.archon/workflows/dev-pipeline.yaml
+++ b/.archon/workflows/dev-pipeline.yaml
@@ -480,10 +480,18 @@ nodes:
       REPO=$(git rev-parse --show-toplevel)
       cd "$REPO/codegraph"
       echo "=== Final Gate ==="
+
+      # Ensure venv exists (worktrees don't have it)
+      if [ ! -f .venv/bin/python ]; then
+        echo "Creating venv..."
+        python3 -m venv .venv
+        .venv/bin/pip install -e ".[python,mcp,test]" -q
+      fi
+
       python3 -m compileall codegraph/ -q 2>&1 && echo "PASS: byte-compile" || exit 1
       .venv/bin/python -m pytest tests/ -q 2>&1 && echo "PASS: tests" || exit 1
       echo "FINAL_GATE_PASS"
-    timeout: 120000
+    timeout: 300000
 
   # ═══════════════════════════════════════════════════════════════
   # Step 8: Update ROADMAP.md