#112 Fix mypy type errors and ruff linting issues

Run mypy and ruff checks on the codebase and fix all issues. Order of operations: 1. First fix all mypy type errors 2. Then fix all ruff linting issues Use parallel agents to speed up the process - can split by: - mypy fixes vs ruff fixes - Different directories/modules Priority: Keep code quality high after recent changes to validator, workflows.py, and test files.