Risk tooling

How big this should be, what it costs to hold, and which position drags the rest down with it.

What it does

A margin health meter and ratio pill show how close the account is sitting to trouble, live
Give it a stop price and what you're willing to lose and it works out the size — including the fees on the way in and the way out, which the obvious arithmetic leaves out
It warns when liquidation sits between entry and stop, because a stop the far side of liquidation never gets to trigger
A payoff chart draws the P&L curve for a position before you commit to it
Stress-test the whole book — what a 10% or 20% move does to equity, with liquidation recomputed at the shocked prices