Fix: Correctly apply 6 decimal precision capacity verification

[RHammond2]

Fix: Correctly apply 6 decimal precision capacity verification

This PR updates the project capacity verification to correctly check with a 6 decimal precision to avoid floating point discrepancies. In addition, all error messages spanning multiple lines are now declared as a variable to simplify the stack trace for easier debugging.

PR Checklist

• CHANGELOG.md has been updated to describe the changes made in this PR
• Documentation (n/a)
  • Docstrings are up-to-date
  • Related docs/ files are up-to-date, or added when necessary
  • Documentation has been rebuilt successfully
  • Examples have been updated
• Tests pass (If not, and this is expected, please elaborate in the tests section)
• PR description thoroughly describes the new feature, bug fix, etc.

Related issues

N/A

Impacted areas of the software

• wombat/core/simulation_api.py
  • _setup_simulation: Updates the project capacity verification for an actual 6 digit precision check.

Additional supporting information

Python version: 3.13.11
WOMBAT version (wombat.__version__): 0.13

The addition of the error message reformatting came about from a difficult to read traceback in a failed capacity verification.

Test results, if applicable

Tests pass.