[PWGEM] PhotonMeson: Remove ROOT dictionary generation - #16860

Use constant references for non-modified iterators in range-based for loops.

Use constant references for non-modified iterators in range-based for loops.

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.

Use std:: prefix for names from the std namespace.

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.

Use std:: prefix for names from the std namespace.

Use std:: prefix for names from the std namespace.

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: thollander/actions-comment-pull-request@v3. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

To tolerate certain issues in a directory, add a line with the test name in "o2linter_config".