[RaphaelFakhri]

Description

CompatRestTransport.list_task_push_notification_configs raised NotImplementedError, so a client using the HTTP+JSON binding could not list push notification configs on a v0.3 agent. The v0.3 REST binding defines the call as GET /v1/tasks/{id}/pushNotificationConfigs. This SDK's own v0.3 compat server (REST03Adapter) serves it, and the v0.3 JSON-RPC and gRPC client transports already implement it.

This change sends the GET request and converts the ListTaskPushNotificationConfigResponse with the existing converters, as the v0.3 gRPC transport does. delete_task_push_notification_config keeps raising NotImplementedError, since the compat REST server does not mount a delete route.

The unit test that asserted NotImplementedError now checks the request path and the parsed configs. Listing two configs against a server built with create_rest_routes(..., enable_v0_3_compat=True) also returns both of them now.

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Fixes #1423

[github-actions]

🧪 Code Coverage (vs main)

⬇️ Download Full Report

	Base	PR	Delta
src/a2a/compat/v0_3/proto_utils.py	90.57%	90.76%	🟢 +0.18%
src/a2a/compat/v0_3/rest_transport.py	95.63%	95.71%	🟢 +0.08%
Total	93.41%	93.42%	🟢 +0.01%

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