Vest: record every trade, the bot's and outside ones, and list them

Vest's position history (GET /v3/positions) gives each position's size,
open and close price, P&L, fees, funding and why it closed. The client
reads it hourly and a minute after a position closes (or a flat balance
moves) into a new trades table, and stores open positions as they
appear. Vest can't tell an API order from a click, so the bot marks its
own opens and closes as it sends them; an unmarked trade since marking
began was someone else's.

The dashboard's Vest firm row gets a Trades button listing every trade
on its accounts with who opened it and how it closed; the account page
shows its own.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

README.md

@@ -248,6 +248,14 @@ own traffic since Vest publishes no API):
   **Commission %** to the same (`0.0025`) for the pre-trade checks.
 - Exits: the take-profit and stop are legs of the position on Vest's side,
   and Vest cancels the other when one triggers.
+- Trades: every position on the accounts, the bot's and anyone else's, from
+  Vest's position history (`GET /v3/positions`) — size, open and close price,
+  P&L, fees, funding and why it closed (stop loss, take profit, liquidation,
+  or an order on the account). Read hourly and a minute after a position
+  closes, into the `trades` table. Vest can't tell an API order from a click,
+  so the bot marks its own opens and closes as it sends them; anything
+  unmarked since marking began was someone else's. The **Trades** button on
+  the Vest firm's dashboard row lists them, and the account page shows its own.
 
 `npm run check` includes the Vest helpers (scripts/check-vest.mjs).