Blue/green or canary deploy: smoke test suite and automatic rollback on stream errors

[greatest0fallt1me]

Post-deploy smoke tests for health, read path, and a synthetic stream op

    ## Description

    After each **deploy** to **staging** (and **production** if applicable), run an

automated smoke suite: /readyz, GET /streams with auth, and a
synthetic create + settle on testnet or mocks to catch catastrophic
misconfiguration before users hit Soroban errors at scale.

    ## Requirements and context

    - **Idempotent** synthetic user or token for smoke only; separate from real users.

• Gating: fail pipeline or auto-rollback hook if SLO not met.

• No production money movement; testnet or chain mock only.

• Timeout and clear logs on failure.

• Docs for re-running smokes by on-call.

    ## Suggested execution
  
    1. `git checkout -b ci/deploy-smoke-streams`
  

2. Add scripts/smoke.sh and wire to CD tool (Argo, GitHub Environments, etc.).

3. PR with at least 3 checks in the smoke; sample green log.

4. Security note: protect synthetic credentials in CI secrets; rotate.

5. 96h; extend to multi-region in follow-up.

    ## Test and commit
   

• Run the full test suite; add or update tests until the agreed coverage bar is met.
• Cover edge cases listed in this issue; document any intentional exclusions with brief rationale in the PR.
• Include relevant test output (e.g. test runner summary) or a link to a passing CI run in the pull request.
• Add security notes for auth, keys, PII, chain settlement, or money movement (assumptions verified, out-of-scope items).

Example commit message

ci(ops): add post-deploy smoke with synthetic stream op on Stellar testnet or mocks

Guidelines

• Target: at least 95% coverage on new or meaningfully changed code (per the repo’s standard tooling).
• Documentation: update contributor-facing or API documentation where a reviewer would be blocked without it.
• Timeframe: 96 hours to ready-for-review (surface blockers early).

[2411015047-afk]

Hi! I can build the blue/green smoke test suite with automatic rollback on stream errors. I have experience with:

• Deploy automation & smoke testing
• Health check endpoints
• Automatic rollback on failure detection
• Stream operations testing

This is a clear paid task. Let me know if you'd like a quote!