Replace test channel dead code allow (#61)

[leynos]

Summary

This branch replaces the file-level allow(dead_code) in tests/support/test_channel.rs with a documented expect(dead_code) so the compiler can report when the test scaffold expectation is no longer needed.

Closes #61.

Review walkthrough

• Start with tests/support/test_channel.rs to review the only code change.
• Confirm the issue triage on #61: this is code-only and remains labelled risk: low.

Validation

• cargo check --all --benches --tests --examples: passed with no warnings.
• coderabbit review --agent: passed with findings: 0 before commit.
• make all: passed, including formatting, clippy, nextest, and GitHub tool tests.
• coderabbit review --agent: passed with findings: 0 after commit.

Summary by Sourcery

Enhancements:

• Improve test support code hygiene by replacing a broad dead code allow with a targeted expect for unused items in the channel test scaffold.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch issue-61-enforce-lint-policy-in-tests-support-test-channel-rs-replace-disallowed-allow-dead-code

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Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Replaces the file-level allow(dead_code) attribute in the test channel support module with a documented expect(dead_code) so the compiler will surface when the dead-code allowance is no longer needed, keeping the test scaffold honest over time.

File-Level Changes

Change	Details	Files
Tighten lint configuration in the test channel support module by replacing a broad dead code allowance with an explicit expectation.	Removed the file-level allow(dead_code) attribute from the test support module Added an expect(dead_code) attribute scoped to the relevant items so that dead code is still allowed but will trigger a compiler note when no longer needed Documented the rationale for the expect(dead_code) usage to clarify intent for future maintainers	tests/support/test_channel.rs

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