Add model-access pre-flight checklist item to step 08 (#1722)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>
Co-authored-by: Peli de Halleux <pelikhan@users.noreply.github.com>

Author: Copilot

workshop/08-run-your-workflow.md

@@ -22,6 +22,7 @@ If you prefer the terminal, you can use `gh aw run daily-report-status` as an ad
 
 ### Before you click Run
 
+- [ ] I completed [Confirm Model Access](07d-confirm-model-access.md) and my chosen billing method (organization centralized billing or `COPILOT_GITHUB_TOKEN`) is active
 - [ ] **Daily Report Status** appears in the **Actions** sidebar
 - [ ] I have at least one open issue in my practice repository