ci: restore deploy pipeline — remove invalid continue-on-error on smoke job

The smoke job is a reusable-workflow 'uses:' call; Actions does not support
continue-on-error there, producing a 0-job workflow failure that has failed
every deploy (so v0.5.0 never reached production). Matches the prautoblogger
fix in #147. Smoke is not in deploy-production needs, so it stays non-blocking.

Agent-Session: cto restore-prcore-deploy

.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 }}