Fix Ping Pong example generics

[leynos]

Summary

• add missing Packet imports and specify HandlerService generic
• implement generic Transform for Logging

Testing

• make lint
• make test

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https://chatgpt.com/codex/tasks/task_e_68589bcc015083228d43e0af7c0f5a44

Summary by Sourcery

Fix generics in the ping_pong example by adding the missing Packet import and updating the Transform implementations for PongMiddleware and Logging to use the correct generic parameters.

Bug Fixes:

• Add missing Packet import in ping_pong example
• Specify HandlerService in PongMiddleware Transform implementation
• Add generic constraint E: Packet and specify HandlerService in Logging Transform implementation

[sourcery-ai]

Reviewer's Guide

Example updated to correctly apply generics to the Transform trait for both PongMiddleware and LoggingService and to import the Packet trait, ensuring middleware works with typed HandlerService and HandlerService.

File-Level Changes

Change	Details	Files
Added missing Packet trait import	Imported Packet trait required for generic constraint	examples/ping_pong.rs
Parameterized Transform for PongMiddleware over Envelope	Changed impl signature to Transform<HandlerService> Updated transform method to accept HandlerService Set Output type to HandlerService	examples/ping_pong.rs
Made Logging middleware generic over packet type E	Added generic parameter E: Packet to impl signature Updated transform method to accept HandlerService Set Output type to HandlerService	examples/ping_pong.rs

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