feat: switch to shtab-generated shell completions and add --print-completion#110

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feat/shtab-completions

Aug 16, 2025

Commits on Aug 15, 2025

feat(generate): enhance template variable parsing and merging logic
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feat(completions): switch to shtab static completions\n\n- Expose get_parser() for shtab\n- Add --print-completion via shtab when available\n- Rework Detected shell: zsh
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