feat(command): port CompletionTrait's suggestion providers

The seven suggest* methods resolve package names, types, and install
preferences for shell completion. PHP returns $this-bound closures; here
each method returns a SuggestedValues whose closure receives the bound
command as `this` at call time. The blanket impl over every BaseCommand
mirrors PHP's per-command `use CompletionTrait;` (the methods are private
there, so the wider visibility is observationally equivalent).

Notable PHP shapes kept: the hintsToFind counter machine iterates a
by-value copy per package (continue 2 -> labelled continue), and
suggestAvailablePackage pins an exact vendor match before truncating to
$max entries.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

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