[Feature]: Policy reference coverage improvements

[TitasGailius]

Feature Description

Policy usages should resolve consistently across common Laravel authorization patterns, and policy methods should expose references where practical.

Gate::authorize('update', $post);
$this->authorize('update', $post);
->middleware('can:update,post')

Should resolve to:

class PostPolicy
{
    public function update(User $user, Post $post): bool
    {
        //
    }
}

Related issues: #204 #264 #454

Potential implementation: #334