purify

# Katara purifies the water A waterbender can pull silt, salt, and poison out of water and leave the water itself untouched. Purify does that to a diff. It draws out what an agent added that does not belong, and keeps every drop of behavior. ## Scope Check the diff against the base branch (default `main`, including the working tree) and remove the AI-generated slop the branch introduced. Touch only lines the branch changed. ## What to draw out - Extra comments that are unnecessary or inconsistent with the file's local style. For a full comment pass, run `clear-water`. - Defensive checks or `try`/`catch` blocks that are abnormal for a trusted code path. Guards belong at system boundaries (Boundary Discipline, Earth in `four-elements`). - Casts to `any` used only to get past a type error. Fix the type instead (see `typescript-forms`). - Deeply nested code that early returns would flatten. - Any other pattern inconsistent with the file and the code around it. ## Rules - Keep behavior unchanged unless you are fixing a clear bug. - Prefer minimal, focused edits over broad rewrites. - Run the nearby tests after the pass. Purify that breaks a test has poisoned the water. ## Reply One to three sentences on what you removed.