ci: fix deploy gate — smoke is informational, not a prod blocker

- Remove invalid continue-on-error from reusable workflow call
  (GitHub Actions doesn't support this property on 'uses:' jobs;
  it caused 0-job workflow failures)
- Remove 'smoke' from deploy-production needs — smoke failures (e.g.
  Playwright infra issues) must not block valid production deploys.
  This matches the pattern already used by the theme repo.
- Smoke still runs and uploads artifacts; it's just not a gate.

.github/workflows/deploy.yml

@@ -51,7 +51,6 @@ jobs:
   smoke:
     name: Smoke tests (staging)
     needs: deploy-staging
-    continue-on-error: true
     uses: peptiderepo/peptide-e2e/.github/workflows/smoke.yml@main
     secrets:
       STAGING_WP_ADMIN_USER: ${{ secrets.STAGING_WP_ADMIN_USER }}
@@ -59,7 +58,7 @@ jobs:
 
   deploy-production:
     name: Deploy to Production
-    needs: [ci, deploy-staging, smoke]
+    needs: [ci, deploy-staging]  # smoke is informational; not gating prod
     runs-on: ubuntu-latest
     environment: production
     steps: