Fix update_api workflow failing on non-JSON AI changelog response

The 'Build changelog entries' step ran under bash -e. When the AI
response wasn't valid JSON, jq exited with status 5, which killed the
whole step instead of falling back to the default changelog entry.
Also always logs the raw AI response for easier debugging.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: dblock

.github/workflows/update_api.yml

@@ -68,7 +68,11 @@ jobs:
         run: |
           entries=""
           if [ "${{ steps.changes.outputs.changed }}" = "true" ]; then
-            entries="$(grep -v '^```' "${{ steps.ai.outputs.response-file }}" 2>/dev/null | jq -r '.entries[]? // empty' 2>/dev/null)"
+            response_file="${{ steps.ai.outputs.response-file }}"
+            echo "AI changelog response:"
+            cat "$response_file" || true
+            filtered="$(grep -v '^```' "$response_file" 2>/dev/null)"
+            entries="$(printf '%s' "$filtered" | jq -r '.entries[]? // empty' 2>/dev/null || true)"
           fi
           if [ -z "$entries" ]; then
             entries="Update API from slack-api-ref@${{ steps.api-ref.outputs.api-ref }}"

CHANGELOG.md

@@ -3,6 +3,7 @@
 * [#591](https://github.com/slack-ruby/slack-ruby-client/pull/591): Generate AI CHANGELOG entries and PR summaries for automated API update PRs, lock simplecov below 1.1.0 to avoid breaking Coveralls - [@dblock](https://github.com/dblock).
 * [#592](https://github.com/slack-ruby/slack-ruby-client/pull/592): Fix a YAML indentation bug in AI CHANGELOG entry generation that broke the automated API update workflow - [@dblock](https://github.com/dblock).
 * [#593](https://github.com/slack-ruby/slack-ruby-client/pull/593): Migrate AI CHANGELOG entry generation to Copilot CLI after GitHub Models retirement - [@dblock](https://github.com/dblock).
+* [#596](https://github.com/slack-ruby/slack-ruby-client/pull/596): Fix the `update_api` workflow failing with exit code 5 when the AI-generated changelog response isn't valid JSON, and always log the raw AI response for debugging - [@dblock](https://github.com/dblock).
 * [#590](https://github.com/slack-ruby/slack-ruby-client/pull/590): Add entity.acknowledgeCommentAction and entity.presentComments methods - [@slack-ruby-ci-bot](https://github.com/apps/slack-ruby-ci-bot).
 * [#590](https://github.com/slack-ruby/slack-ruby-client/pull/590): Add admin.apps.mcpServers, admin.apps.mcpServers.permissions, and admin.apps.permissions endpoints - [@slack-ruby-ci-bot](https://github.com/apps/slack-ruby-ci-bot).
 * [#590](https://github.com/slack-ruby/slack-ruby-client/pull/590): Add a metadata argument to chat.postEphemeral - [@slack-ruby-ci-bot](https://github.com/apps/slack-ruby-ci-bot).