Implement youaskm3 knowledge workflow UI

[enricopiovesan]

Summary

Build the youaskm3 UI flow: user submits a question or knowledge item → UI sends to Traverse runtime → UI renders runtime-provided output (answer, reasoning, trace status). UI computes no business fields.

Why

This is the product-facing deliverable of youaskm3 — a browser-hosted knowledge workflow app that demonstrates the full Traverse-consumable path from user input to governed runtime output.

Definition of Done

• User can submit a question or knowledge item
• UI sends input to Traverse via the HTTP client from Add youaskm3 Traverse HTTP runtime client #13
• UI renders runtime-provided output: answer/result, reasoning trace, status
• UI shows loading, polling, error, and final states
• UI computes no business fields locally
• No private Traverse internals imported
• Unit tests cover state machine and output rendering

Depends on

#13 (youaskm3 HTTP client)