Add shell completions for bash, zsh, and fish#14

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vobu merged 13 commits intomainfrom

copilot/add-shell-completions

Jan 31, 2026

Commits on Jan 30, 2026

Merge remote-tracking branch 'origin/main' into copilot/add-shell-completions
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Merge remote-tracking branch 'origin/main' into copilot/add-shell-completions
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test: improve error and log output assertions for unknown shell handling
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