0.4.0: Claim, Models/ DTOs, compile

LeaderboardSession.ClaimAsync sends onClaim. Generated DTOs live under Models/ with nullable wire fields. Remove incomplete duplicate type files.

CHANGELOG.md

@@ -1,5 +1,17 @@
 # Changelog
 
+## 0.4.0
+
+- Generated DTOs live under `Models/` (`RudderSdk.Core.Models`). Wire fields
+  are nullable. `ListQuestsRequest` is gone; `Quests.ListAsync` POSTs with
+  no body. `BoundaryNode.WaitDeadline` is `DateTimeOffset?`.
+- `LeaderboardSession.ClaimAsync` / `Claim` complete the leaderboard node
+  with handle `onClaim`. The server matches live rank to an authored place.
+- `RewardClaimedAsync` / `RewardClaimed` are obsolete aliases and will be
+  removed in the next SDK version.
+- `rank_not_eligible` on Claim leaves the session open (retry Claim or End);
+  it no longer fails the run.
+
 ## 0.3.0
 
 ### Removed