#105 Make numan completions install by default

Summary

• numan completions <shell> now installs to the canonical path and creates parent directories (mkdir + write), so redirects no longer fail on a missing completion dir
• --print keeps the previous stdout behavior for piping and custom redirects
• Docs, changelog, and tests updated for the new default

Test plan

• cargo test completions
• cargo clippy -- -D warnings
• Run numan completions bash and confirm ~/.local/share/bash-completion/completions/numan is created
• Run numan completions bash --print | head and confirm script-only stdout

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