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Tighten six guard conditions via De Morgan / blank? / present? / include? (#2707)

Six spots where an `if`/`unless` clause used multiple negations
joined by `&&` or `||`, or `&.any?` on a Hash. Each rewrite expresses
the positive shape of the predicate and keeps `if` over `unless`
where natural. Same behaviour, same allocation profile (one form
even reuses a previously-recomputed `Hash#except` result).

* `Grape::API::Boolean.build` —
  `val != true && val != false` → frozen `VALUES` constant +
  `unless VALUES.include?(val)`.

* `Grape::Request#make_params` —
  `routing_args&.any? { |k, _| k != :version && k != :route_info }` +
  separate `routing_args.except(:version, :route_info)` two lines
  later → compute `except` once, gate on `filtered.blank?`.

* `Grape::Validations::ParamsScope#check_incompatible_option_values`
  (early guard) —
  `return unless default && !default.is_a?(Proc)` →
  `return if default.nil? || default.is_a?(Proc)`.

* `Grape::Validations::ParamsScope#check_incompatible_option_values`
  (raise condition) —
  `!Array(default).all? { |v| values.include?(v) }` →
  `Array(default).any? { |v| !values.include?(v) }`.

* `Grape::Validations::Validators::Base#scrub` —
  `unless value.respond_to?(:valid_encoding?) && !value.valid_encoding?`
  → `if !value.respond_to?(:valid_encoding?) || value.valid_encoding?`.

* `Grape::DSL::Routing#route` —
  `route_options&.any?` → `route_options.present?`.

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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