fix(view): avoid wrapping array results

[reggi]

npm 12.0.0 breaks downstream updaters by returning nested arrays for npm view <pkg> versions --json.

The bug

On npm 12.0.0, a single array-valued field is wrapped in the outer results array:

$ npm view abbrev versions --json
[["1.0.3","1.0.4", ...]]   # should be ["1.0.3","1.0.4", ...]

This happens in lib/commands/view.js #packageOutput: for a single-field query it maps to res.map(m => m[first[0]]), and when that field's value is itself an array (e.g. versions), it gets double-wrapped.

The fix

Return a sole array-valued JSON result directly instead of adding a second result wrapper. Existing output shapes are preserved:

• scalar and object results still return in an array (["1.0.0"], [{...}])
• multiple matching versions keep the result boundary ([[...],[...]])
• a single array-valued result is returned directly (["1.0.0","1.0.1"])

Docs and tests updated to cover flat array, nested array, object-wrapper, workspace, and multi-match cases.