fix/checkpoint global step

[joellidin]

Description

• (validator) Add global step information in ckpt
• (validator) Use global step from scheduler

Related Issue(s)

• Closes #[issue number]

Type of Change

• Feature (adding new functionality)
• Fix (resolving a bug or issue)
• Docs (documentation updates)
• Refactor (code changes that don't affect functionality)
• Maintenance (dependency updates or other maintenance)
• Tests (adding or improving tests)
• Breaking change (fix or feature with incompatible API changes)
• Other: _____

Branch Naming

• My branch follows the project's naming convention (e.g., feature/add-new-capability)

Commit Messages

• My commits are small, atomic, and have proper commit messages
• Commit messages are in imperative mood with a capitalized summary under 50 chars

Code Quality

• I've performed a self-review of my code
• I've added appropriate docstrings following the project's conventions
• I've added proper logging where necessary (without trailing periods)
• I've applied linting and formatting with Ruff
• My code generates no new warnings

Testing

• I've added tests for new functionality or bug fixes
• All tests pass locally with my changes
• Test coverage has not decreased

Documentation

• I've updated documentation to reflect my changes
• I've updated comments in hard-to-understand areas

If this is a breaking change

Screenshots/Examples

Additional Notes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

@@           Coverage Diff           @@
##              dev     #295   +/-   ##
=======================================
  Coverage   45.65%   45.65%           
=======================================
  Files          13       13           
  Lines        2462     2462           
=======================================
  Hits         1124     1124           
  Misses       1338     1338           

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