What happened?

The Java SDK seems to diverge from both the specification and other SDK implementations:

• Java SDK example:

  a2a-java/spec/src/main/java/io/a2a/spec/MessageSendConfiguration.java

  Line 16 in ce15a42

  PushNotificationConfig pushNotification, boolean blocking) {

• Python example: https://github.com/a2aproject/a2a-python/blob/675354a4149f15eb3ba4ad277ded00ad501766dd/src/a2a/types.py#L1291
• TypeScript example: https://github.com/a2aproject/a2a-js/blob/21048fb0425d27323c67a1d3d19f64f79220d689/src/types.ts#L505

I'll attach a PR shortly.

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