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Deprecate positional options Hash for desc; add grape-swagger integration spec (#2723)

`Grape::DSL::Desc#desc` now takes its options as keyword arguments.
Passing a positional options Hash still works but emits a deprecation
warning, so downstream callers (e.g. grape-swagger) keep functioning.

Adds a grape-swagger integration spec plus a CI matrix entry and
`gemfiles/grape_swagger.gemfile`. The spec exercises
`add_swagger_documentation` and asserts the generated OpenAPI document,
guarding the compatibility shim: grape-swagger 2.1.4 still passes a
positional Hash to `desc` internally.

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

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