Replace proto.Message with msg

[meling]

Fixes #259

Use the msg type alias more consistently instead of the proto.Message in type parameters.

[deepsource-io]

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[Copilot]

Pull request overview

This PR addresses #259 by standardizing protobuf-related generic type constraints to use the package-level msg type alias (instead of proto.Message) across core call paths and related tests.

Changes:

• Replace proto.Message constraints/usages in type parameters with msg in unicast, multicast, and RPC helpers.
• Update channel routing/request plumbing to use NodeResponse[msg] (and remove now-unneeded proto imports).
• Update affected tests/benchmarks to use NodeResponse[msg] consistently.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
unicast.go	Switch Unicast type parameter constraint to msg and align response channel types.
rpc.go	Switch RPCCall type parameter constraints and response channel types to msg.
multicast.go	Switch Multicast type parameter constraint to msg.
channel.go	Update internal request/response routing plumbing to use NodeResponse[msg] and remove proto import.
responses_test.go	Update test helpers and test cases to use NodeResponse[msg] and remove proto import.
channel_test.go	Update helper/benchmarks to use NodeResponse[msg] consistently.

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