ci: fix cto-review ARG_MAX (#110) + restore deploy pipeline

- cto-review.yml: pass the PR diff to the review step via a file
  (/tmp/cto-review-diff.txt) instead of a step output/env var. A ~400KB diff
  in the process env exceeds the runner ARG_MAX and failed the 'Call 4 models'
  step with 'Argument list too long' (#110).
- deploy.yml: remove invalid 'continue-on-error: true' from the smoke job
  (a reusable-workflow 'uses:' call). Actions does not support this property
  on 'uses:' jobs; it produced a 0-job workflow failure that has been failing
  every deploy. Matches the fix already in prcore/theme.

Closes #110.

Agent-Session: cto fix-cto-review-and-deploy

.github/workflows/deploy.yml

@@ -64,7 +64,6 @@ 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 }}