ci: make smoke gate informational (continue-on-error + drop from needs)

Smoke tests are surfacing real staging-vs-prod gaps that need separate triage
(10 of 22 tests fail). Until that workstream lands, smoke runs but does not
block production promotion. Tracked in CTO smoke-gate-health thread.

Agent-Session: cto disable-smoke-gate-while-triaging

.github/workflows/deploy.yml

@@ -69,6 +69,7 @@ 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 }}