Migrate Danger to use danger-pr-comment workflow.

- Add danger, danger-pr-comment, danger-changelog, and danger-toc to Gemfile
- Update Dangerfile to import danger-pr-comment gem
- Add changelog.check! and toc.check! to Dangerfile
- Follows pattern from slack-ruby/slack-ruby-client#581 and slack-ruby/slack-ruby-bot-server#181

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <[email protected]>

Author: dblock

CHANGELOG.md

@@ -9,6 +9,7 @@
 * Your contribution here.
 * [#87](https://github.com/ruby-grape/grape-swagger-entity/pull/87): Remove hidden attributes from required - [@bogdan](https://github.com/bogdan).
 * [#88](https://github.com/ruby-grape/grape-swagger-entity/pull/88): Update danger workflows - [@numbata](https://github.com/numbata).
+* [#89](https://github.com/ruby-grape/grape-swagger-entity/pull/89): Remove ruby-grape-danger - [@dblock](https://github.com/dblock).
 
 ### 0.7.0 (2025/08/02)
 

Dangerfile

@@ -1,3 +1,6 @@
 # frozen_string_literal: true
 
-danger.import_dangerfile(gem: 'ruby-grape-danger')
+danger.import_dangerfile(gem: 'danger-pr-comment')
+
+changelog.check!
+toc.check!

Gemfile

@@ -43,7 +43,10 @@ group :development do
 end
 
 group :test do
+  gem 'danger', require: false
+  gem 'danger-changelog', require: false
+  gem 'danger-pr-comment', require: false
+  gem 'danger-toc', require: false
   gem 'grape-entity', grape_entity_spec
-  gem 'ruby-grape-danger', '~> 0.3.0', require: false
   gem 'simplecov', require: false
 end