Revert "fix(ci): ignore generated lockfiles in changelog gate"

This reverts commit 8deb72ffa8.

.github/workflows/pr-check-changelog.yml

@@ -66,17 +66,6 @@ jobs:
               # Get files changed in this folder
               changed_in_folder=$(echo "${STEPS_CHANGED_FILES_OUTPUTS_ALL_CHANGED_FILES}" | tr ' ' '\n' | grep "^${folder}/" || true)
 
-              # Generated lockfiles are handled separately and should not force a changelog entry.
-              # They frequently move when dependency tooling is re-run without any user-facing behavior change.
-              case "$folder" in
-                api)
-                  changed_in_folder=$(echo "$changed_in_folder" | grep -vE "^api/poetry\\.lock$" || true)
-                  ;;
-                mcp_server)
-                  changed_in_folder=$(echo "$changed_in_folder" | grep -vE "^mcp_server/uv\\.lock$" || true)
-                  ;;
-              esac
-
               if [ -n "$changed_in_folder" ]; then
                 echo "Detected changes in ${folder}/"