Jini
The proof is not a theory. It is whether Jini can turn something messy into something usable while keeping the remaining risk visible.
The core test
What proof should look like
You're working on Research to PRD handoff Ready now - Build-Readiness Check - Handoff Brief Still missing - Product approval Next step Open Build-Readiness Check
That is enough for a user to understand the value. Something useful is already ready, the blocker is visible, and the next move is obvious.
User trust
What must also be obvious
What to type
A first-time user should be able to see the front door immediately.
What route Jini chose
The chosen provider, model, and route reason should be visible before the draft starts.
Whether the result is still a draft
The user should know when it is still safe to review before anything is shared.
If those signals are not obvious, the product still has work to do.