Continued the maintainability-driven restructuring from yesterday, breaking apart more modules across the codebase — computeRewrites, planFileMoves, parseVtt, displayPaginated, and others were split into focused sub-modules. This was another round of using the restructure command on the codebase itself.

Added a default action to the complexity command so running it without arguments gives useful output immediately. Also added SHA validation to prs fixed to match what wontfix already had, and allowed gh pr view and gh pr diff in the permissions allow list. Improved the maintainability error message to be clearer about what needs attention.