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Implement a TrioSignalManager class that wraps trio's memory channel API for bidirectional async…

Implement a TrioSignalManager class that wraps trio's memory channel API for bidirectional async…: a task in r2e-code-instruct-qwen3.5 (Harbor dataset). Input: None. Output: A class instance with async send(value) and receive() methods.

The task

Input: None. Output: A class instance with async `send(value)` and `receive()` methods.

Part of Essacheez/r2e-code-instruct-qwen3.5.