feat(deploy): switch TS SDK flow to auto_promote

[rmorehig]

Summary

• switch deploy API usage to auto_promote=true by default for non-check deploys
• remove manual /v1/deployments/{id}/set-live logic from the TS SDK
• keep deploy polling to wait for final result (data-ready and auto-promote completion)
• retain --check semantics by not sending auto_promote
• update deploy tests for the new request/response flow

What changed

• src/api/deploy.ts
  • adds autoPromote option (defaults to true unless check)
  • sends auto_promote=true in deploy query params
  • removes manual set-live path
  • keeps polling /v1/deployments/{id} for readiness/final status
• src/api/deploy.test.ts
  • rewrites deploy flow tests around auto-promote + polling behavior

Validation

• pnpm -s vitest run src/api/deploy.test.ts src/cli/commands/deploy.test.ts src/cli/commands/preview.test.ts
• pnpm -s typecheck

Closes #111