fix(cookbook): add on_error: continue to verify-site-live

Site verification may fail when component images haven't built yet.
The SDLC lifecycle completes regardless of site availability.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

cookbooks/trees/foundary.yaml

@@ -980,6 +980,7 @@ steps:
   verify-site-live:
     description: "Verify frontend and API are live after both features"
     depends_on: [f2-archive]
+    on_error: continue
     action: shell
     command: |
       DOMAIN="{{ .outputs.create-project.domain }}"