[codex] Delete previous deployment after promotion

[rmorehig]

Summary

• Track the previously live deployment before starting a normal TS SDK deploy.
• After the new deployment is successfully set live, delete the previous live deployment so it does not remain in staging.
• Add unit coverage for the manual promote/delete flow and live e2e coverage that polls the deployments API for the previous deployment to become deleted.

Why

The TS SDK deploy flow was doing the manual set-live step but was missing the old deployment cleanup that the Python CLI performs in its manual promotion path. That could leave the previous deployment visible as staging after a successful deploy.

Validation

• pnpm vitest run src/api/deploy.test.ts
• pnpm typecheck
• pnpm test:e2e:live -- e2e-live/deploy.test.ts (skipped locally because live Tinybird e2e credentials are not configured)
• pnpm build

[rmorehig]

@cursor review

[cursor]

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