refactor-dead-code

# Refactor Dead Code ## Trigger Use when code appears unused and safe to delete. ## Inputs - Static search results or lints indicating dead symbols. ## Outputs - Deletions of obsolete symbols and updated references. ## Procedure 1. Confirm usage across repository. 2. Remove dead symbols and imports. 3. Run tests and targeted checks. ## Guardrails - Do not remove extension points without explicit confirmation. - Keep public API surfaces unless user approves. ## Success criteria - No remaining references and tests pass. ## Prefer Superpowers - Use `test-driven-development` for added safety checks. ## Avoid scope creep - Keep deletion scope tied to explicit task write set.