[kartojal]

Add PolymarketPriceSpec(asset_ids=[...]) to async public and secure client subscriptions, following the public websocket contract. Typed events expose best bid/ask quotes, populated or empty initial snapshots, and live changes. Public subscriptions use an unauthenticated connection pool; existing market websocket subscriptions retain their transport.

Validation: 282 focused realtime tests and the full unit suite (3,521 passed, 190 integration tests deselected) passed. Ruff lint, formatting, and Pyright passed. A local websocket peer covers request encoding, dispatch by asset, malformed-frame neighbors, shared-listener replay, reconnect/resubscription, and cleanup.

---

Note

Medium Risk
New websocket parsing and subscription routing in shared realtime infrastructure; mistakes could mis-attribute snapshots or break existing price streams, though polymarket BBO uses a separate client manager and optional auth path.

Overview
Adds PolymarketPriceSpec(asset_ids=[...]) so public and secure clients can subscribe to realtime best bid/ask quotes on the price.polymarket websocket channel, with typed PolymarketPriceEvent snapshots and updates.

The realtime stack now keys subscriptions by asset_id, encodes price.polymarket wire filters, and parses frames via parse_polymarket_price_event (including empty cold snapshots correlated to filters through subscribe ack order). PriceConnection treats API credentials as optional and skips auth for these public feeds; public clients use a dedicated unauthenticated RealtimeStreamManager, while secure clients keep a separate pool from authenticated crypto/equity price streams.

Exports, subscribe overloads, and session snapshot/replay behavior are extended for polymarket BBO; unit tests cover encoding, malformed frames, shared-listener replay, reconnect, and asset-id validation.

^{Reviewed by Cursor Bugbot for commit 50cfc79. Bugbot is set up for automated code reviews on this repo. Configure here.}