Per-exchange WebSocket configuration.

T94 ships WS configuration for the priority-tier universe using the extended shape that routes WS subscription patterns (CCXT.WS.Subscription) and WS auth patterns (CCXT.WS.Auth). Replaces T92's 3-canary subscribe_builder: {mod, fun} with subscription_pattern + auth_pattern dispatch atoms.

Count: 13 exchanges — every entry here has a matching CCXT.Registry module. T102 (2026-04-19) removed three orphan entries (bingx, bitget, mexc) whose Registry lookups raised because no spec file exists for them under the current tier1/tier2/dex scope. Add them back via mix ccxt_extract.update --exchange <id> + a re-register in Registry before reinstating their config here.

WS URLs currently live in this consumer-side map because JSON specs don't yet surface a clean urls.api.ws field. A follow-up ccxt_extract task will emit urls.api.ws.{public,private,sandbox_public,sandbox_private} from the JS AST; when it lands, this module can be replaced by a one-line read from exchange.spec["urls"]["api"]["ws"]. (Prior to schema 3.0.0 the raw AST was available under structure.ws_methods; T117 dropped that payload to fit the Hex size cap — the upstream WS-URL task supersedes that path.)

Entry shape

%{
  public_url: String.t() | nil,           # may contain `{hostname}` placeholder; nil = requires REST pre-call
  public_url_sandbox: String.t() | nil,
  private_url: String.t() | nil,
  private_url_sandbox: String.t() | nil,
  heartbeat: %{type: :ping | :deribit | :custom, interval: pos_integer() | nil},
  subscription_pattern: atom(),           # routed via CCXT.WS.Subscription
  subscription_config: map(),
  auth_pattern: atom() | nil,             # routed via CCXT.WS.Auth; nil = public-only wiring
  auth_config: map()
}

Known URL limitations (MVP — single URL per public/private slot)

Several exchanges expose per-product URLs (spot vs linear/inverse swap vs option). The current shape captures one representative URL per {section, sandbox} slot; product routing will land in a follow-up task once the adapter layer needs it.

• bybit — linear-only (/v5/public/linear). spot/inverse/option need routing.
• binance — spot-only. USDⓈ-M futures (fstream.binance.com), COIN-M (dstream.binance.com), and portfolio margin (/pm/ws) need routing.
• htx / huobi — spot-only (api.huobi.pro/ws). Contract/swap endpoints live on api.hbdm.vn.
• aster — spot-only. Swap on fstream.asterdex.com.
• kucoin — URLs are fully dynamic (REST POST /api/v1/bullet-{public,private} returns the WSS host + token). Recorded as nil until the adapter layer wires the pre-call.