feat(client): support perps TP/SL orders

[cesarenaldi]

Summary

• Add Perps TP/SL order metadata parsing and lifecycle event handling.
• Add Perps session helpers for bracket orders and full-position take-profit/stop-loss placement.
• Add focused tests and a patch changeset.

Linear: https://linear.app/polymarket/issue/DEV-334/support-perps-tpsl-in-the-typescript-sdk

Verification

• pnpm test:bindings -- --run packages/bindings/src/perps/orders.test.ts
• pnpm --filter @polymarket/bindings build
• pnpm test:client -- --run packages/client/src/websockets/perps/session.test.ts
• pnpm --filter @polymarket/client build
• pnpm lint
• pnpm typecheck

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Note

Medium Risk
Touches signed perps trading commands and extends createOrders wire format; mistakes could mis-place exits, but changes are additive with focused tests and ordinary orders stay on the existing path.

Overview
Adds Perps take-profit/stop-loss support across bindings and the session client: new PerpsTpSlKind / PerpsTpSlScope types, optional tpSl metadata on REST and websocket order payloads, and tpsl:: lifecycle events (untriggered, armed, cancelled, expired) merged into PerpsSessionEvent.

On the client, placeBracketOrder submits the entry leg plus optional TP/SL exits in one grouped createOrders (grp: 'order'), and placePositionTakeProfitStopLoss places full-position market triggers (grp: 'position'). Order encoding now supports reduce-only legs, optional tif, and tr trigger bodies (trp, tpsl, optional market). Sessions subscribe to tpsl alongside existing account channels.

Includes binding/client tests and patch changesets for @polymarket/client and @polymarket/bindings.

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