Add youaskm3 Phase 1 smoke test

[enricopiovesan]

Summary

Add a deterministic, CI-friendly smoke test for youaskm3 Phase 1 that proves the full HTTP path: runtime reachable → execute → poll → output fields present.

Why

Without a smoke test, there is no way to automatically verify that the youaskm3 UI integration works end-to-end against a real local Traverse runtime.

Definition of Done

• Smoke test starts or connects to local Traverse runtime at 127.0.0.1:8787
• POSTs a fixture knowledge request to /v1/workspaces/local-default/execute
• Polls for completion
• Asserts required runtime-provided output fields are present and non-empty
• Exits 0 on pass, exits 1 with diagnostics on fail
• Added to scripts/ci/ and referenced in nightly workflow

Governing spec

033-http-json-api (approved v1.1.0)

Depends on

#14 (youaskm3 knowledge workflow UI)