reorganize tests; bump coverage check to 0.3.1

[mcharytoniuk]

No description provided.

[Copilot]

Pull request overview

This PR reorganizes a subset of Rust tests by moving them from trzcina/tests integration tests into #[cfg(test)] unit-test modules co-located with the relevant source files, and updates the JavaScript dev dependency used for Rust coverage checking.

Changes:

• Moved ServiceShutdownOptions tests from integration tests into trzcina/src/service_shutdown_options.rs as unit tests.
• Moved ServiceShutdownError Display-formatting tests from integration tests into trzcina/src/service_shutdown_error.rs as unit tests.
• Bumped @intentee/rust-coverage-check from 0.2.0 to 0.3.1.

Reviewed changes

Copilot reviewed 8 out of 9 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
trzcina/tests/service_shutdown_options_default_uses_ten_second_deadlines.rs	Removed (test relocated into service_shutdown_options.rs unit tests).
trzcina/tests/service_shutdown_options_can_be_cloned.rs	Removed (test relocated into service_shutdown_options.rs unit tests).
trzcina/tests/service_shutdown_error_display_propagates_outcome_writer_error.rs	Removed (test relocated into service_shutdown_error.rs unit tests).
trzcina/tests/service_shutdown_error_display_propagates_header_writer_error.rs	Removed (test relocated into service_shutdown_error.rs unit tests).
trzcina/tests/service_shutdown_error_display_formats_all_failure_variants.rs	Removed (test relocated into service_shutdown_error.rs unit tests).
trzcina/src/service_shutdown_options.rs	Added #[cfg(test)] unit tests for defaults and cloning.
trzcina/src/service_shutdown_error.rs	Added #[cfg(test)] unit tests for Display formatting and writer error propagation.
package.json	Bumped @intentee/rust-coverage-check to 0.3.1.
package-lock.json	Updated lockfile to reflect @intentee/rust-coverage-check@0.3.1.

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