Implementing Ghost Migrations for Large-Scale MySQL Table Refactoring

Act as a Principal MySQL Architect. Provide a flawless, production-ready implementation guide for deploying `gh-ost` (GitHub's Online Schema Change tool) to safely execute a complex table refactor on a massive, highly active [TABLE_SIZE] (e.g., 2TB+) InnoDB table without locking the database. You must perfectly integrate this bash execution logic into an automated [CI_CD_RUNNER] workflow. Mathematically define the specific throttling parameters ([GH_OST_THROTTLE_PARAMS]) required to dynamically pause the migration based on active replica lag metrics and master thread loads, ensuring 100% database availability. Explicitly detail the atomic `RENAME TABLE` cut-over strategy, how to automate the eventual cleanup of the `_gho` and `_del` ghost tables post-migration, and provide an instant abort/contingency plan if the cut-over phase encounters a severe lock timeout.