Add tests for run_management.py and remove coverage exclusion

[ealt]

Context

The simplexity/run_management/run_management.py module has been temporarily excluded from coverage tracking because:

• The module is currently largely untested
• PRs that touch this module are failing diff-coverage checks due to the large number of uncovered lines
• This blocks feature PRs for reasons outside the scope of those features

Requirements

1. Write comprehensive tests for simplexity/run_management/run_management.py
2. Ensure test coverage meets or exceeds the 80% threshold
3. Remove the exclusion from pyproject.toml (line ~141)
4. Remove the TODO comment referencing this issue

Files to Modify

• Create tests/run_management/test_run_management.py (or similar test file)
• Remove exclusion from pyproject.toml

Success Criteria

• Coverage for run_management.py is ≥ 80%
• All tests pass
• The file is no longer in the coverage omit list