fix: add beads (bd) install to integration.yml

The integration.yml workflow was missing the beads CLI installation
that the main ci.yml has. This caused integration tests to fail with
"beads dependency check failed".

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.github/workflows/integration.yml

@@ -29,6 +29,12 @@ jobs:
           git config --global user.name "CI Bot"
           git config --global user.email "ci@gastown.test"
 
+      - name: Install beads (bd)
+        run: go install github.com/steveyegge/beads/cmd/bd@latest
+
+      - name: Add to PATH
+        run: echo "$(go env GOPATH)/bin" >> $GITHUB_PATH
+
       - name: Generate embedded files
         run: go generate ./internal/formula/...