Clouds, step 3: the first vendor uses (GitHub Actions gate shards, Cloudflare KV as the edge cache rung, Vercel Sandboxes for burst check cells), each declared and each with its way home #1686

Later: It needs the declaration and the accounts from #1146's steps 1 and 2 to land first, and each use is its own run.

From #1146. Each use goes through steps 1 and 2 (mayUse, Cloud accounts, the audit), one pull per vendor.