test: add mutation testing coverage for survived and untested mutants#76

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Copilot wants to merge 7 commits intomainfrom

copilot/add-test-coverage-for-mutants

Commits on Mar 8, 2026

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test: add mutation-testing tests for models and protocol

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test: add direct tests for _build_app and _save_cache to defeat mutants

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test: add direct unit tests to catch client.py mutation testing mutants

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Copilot
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test: add mutation-killing tests for CLI functions

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Copilot
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test: add mutation-killing tests for TUI widget format functions

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test: add _resolve_version subprocess arg verification tests

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deviantintegral
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