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Document retirement of the standalone Grape pattern adapter - #22
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Explain the Grape 3.3.0 inlining, retained RubyGems releases, and explicit dependencies for legacy or standalone type: :grape users. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Add a prominent README retirement notice explaining that Grape 3.3.0, released June 20, 2026, inlined the grammar as
Grape::Router::MustermannPatternand replaced the adapter dependency with Mustermann directly (ruby-grape/grape#2755).Existing RubyGems releases remain available for older Grape applications and standalone users. Applications using
Mustermann.new(pattern, type: :grape)must keep an explicit dependency and require; Grape’s internal class does not register that standalone type. Direct current-Grape routing reports to Grape itself.Restore the existing Ruby 2.6, 2.7, and 3.0 CI jobs by pinning test helpers to Mustermann v3.0.4 instead of tracking main, which now requires Ruby 3.3. Use Ubuntu 22.04 and Bundler 2.4.22 for the legacy matrix, current checkout, read-only permissions, and bounded independent jobs.
This PR does not archive the repository, remove releases, or change runtime requirements or behavior.
AI-authored on behalf of @dblock.
Validation: all 700 examples pass locally on Ruby 2.7. The exact-head CI run passes on Ruby 2.6, 2.7, and 3.0.