Simplify PR welcome messages to be more concise

Reduced both PR welcome message workflows to single-line summaries:
- Removed verbose bullet-point lists and detailed explanations
- Kept only essential information: how to trigger full CI
- Eliminated redundant information between the two workflows

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

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

Author: justin808

.github/workflows/pr-welcome-comment.yml

@@ -19,20 +19,4 @@ jobs:
           body: |
             👋 Thanks for opening this PR!
 
-            ### 🚀 Running Full CI Suite
-
-            By default, PRs run a subset of CI jobs for faster feedback (latest Ruby/Node versions only).
-
-            To run the **complete CI suite** including all dependency combinations and skipped jobs, comment:
-
-            ```
-            /run-skipped-ci
-            ```
-
-            This will trigger:
-            - ✅ Minimum supported versions (Ruby 3.2, Node 20)
-            - ✅ All example app tests
-            - ✅ Pro package integration tests
-            - ✅ All test matrices
-
-            The full CI suite takes longer but ensures compatibility across all supported versions before merging.
+            **Need full CI coverage?** Comment `/run-skipped-ci` to test against minimum supported versions (Ruby 3.2, Node 20) and all test matrices.

.github/workflows/pr-welcome-message.yml

@@ -18,21 +18,7 @@ jobs:
             const welcomeMessage = [
               '👋 **Thanks for your contribution!**',
               '',
-              'This PR will run CI tests based on the files you changed. If some tests are skipped and you want to run the full test suite (including minimum dependency tests), you can use these commands:',
-              '',
-              '### CI Control Commands',
-              '',
-              '- **`/run-skipped-ci`** - Runs all skipped CI checks and enables full CI mode for this PR',
-              '  - Adds the `full-ci` label to ensure future commits also run the full test suite',
-              '  - Useful when you want comprehensive testing across all configurations',
-              '',
-              '- **`/stop-run-skipped-ci`** - Disables full CI mode and returns to standard CI',
-              '  - Removes the `full-ci` label',
-              '  - Future commits will only run tests for changed files',
-              '',
-              '**Note:**',
-              '- These commands require write access to the repository',
-              '- The `full-ci` label is preserved on merged PRs as a historical record',
+              '**Need full CI coverage?** Comment `/run-skipped-ci` to test against minimum supported versions (Ruby 3.2, Node 20) and all test matrices.',
               '',
               'View CI progress in the [Actions tab](${context.serverUrl}/${context.repo.owner}/${context.repo.repo}/actions).'
             ].join('\n');