fix: NewMarket/MarketResolved WS filtering + MAKER_REBATE deserialization

[yovanoc]

Summary

Two bug fixes:

1. WS stream silently drops NewMarket/MarketResolved events

subscribe_market_with_options filters all messages by the subscriber's asset_ids_set. For NewMarket and MarketResolved, this check always fails because:

• NewMarket events contain the new market's asset IDs, which are unknown to the subscriber
• MarketResolved events contain the resolved market's asset IDs, which may differ from subscribed ones

These are broadcast-style events and should always be yielded to consumers. The server correctly sends them to all connections with custom_feature_enabled, but the client-side filter discards them.

Fix: Always yield NewMarket and MarketResolved variants regardless of asset_ids_set.

2. MakerRebate deserializes to Unknown("MAKER_REBATE")

The ActivityType enum uses #[serde(rename_all = "UPPERCASE")], which converts MakerRebate → MAKERREBATE. The API returns MAKER_REBATE (with underscore), so it falls through to Unknown("MAKER_REBATE").

Fix: Add explicit #[serde(rename = "MAKER_REBATE")] and #[strum(serialize = "MAKER_REBATE")] on the MakerRebate variant.

---

Note

Low Risk
Low risk: small, targeted fixes to client-side WS message filtering and enum (de)serialization; main risk is slightly increased WS message volume for market subscriptions.

Overview
Fixes market WebSocket subscriptions to always forward broadcast-style WsMessage::NewMarket and WsMessage::MarketResolved events instead of filtering them out by subscribed asset_ids.

Updates ActivityType::MakerRebate to explicitly (de)serialize as MAKER_REBATE, preventing API values from falling through to Unknown.

^{Written by Cursor Bugbot for commit 9160e60. This will update automatically on new commits. Configure here.}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.46%. Comparing base (eb1bcd9) to head (9160e60).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #299      +/-   ##
==========================================
- Coverage   85.47%   85.46%   -0.02%     
==========================================
  Files          32       32              
  Lines        5129     5124       -5     
==========================================
- Hits         4384     4379       -5     
  Misses        745      745              

Flag	Coverage Δ
rust	85.46% <100.00%> (-0.02%)	⬇️

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