Fix: Remove continue-on-error from Install Overmind CLI step

The CLI install was failing silently, causing 'overmind: command not found'
error in subsequent steps. Now the workflow will fail properly if CLI
installation fails, and we added a check to verify the CLI exists.

Author: jameslaneovermind

.github/workflows/scale-test.yml

@@ -154,7 +154,7 @@ jobs:
 
       - name: Install Overmind CLI
         uses: overmindtech/actions/install-cli@main
-        continue-on-error: true
+        id: install-cli
         with:
           version: latest
           github-token: ${{ secrets.GITHUB_TOKEN }}
@@ -183,6 +183,12 @@ jobs:
         run: |
           echo "Fetching change results from: ${{ steps.submit-plan.outputs.change-url }}"
           
+          # Verify overmind CLI is available
+          if ! command -v overmind &> /dev/null; then
+            echo "::error::Overmind CLI not found. Install step may have failed."
+            exit 1
+          fi
+          
           # Get the full change analysis as JSON
           overmind changes get-change \
             --change "${{ steps.submit-plan.outputs.change-url }}" \