refactor

Target: $ARGUMENTS ## Evidence first - `wc -l` on the target; the two responsibilities named when claiming a split. - Dead code: `grep -rn` for every symbol, plus `go vet` and `golangci-lint run` (`unused`, `unparam`); a symbol only tests reference is dead in the product. List candidates with the evidence — **deleting them is a separate decision the maintainer takes**, unless the task said to delete. - `git log --oneline -10 -- <path>` to know why the shape is what it is before changing it. ## Rules - Behaviour identical: `make test` green before and after; golden files unchanged (a golden diff means this was not a refactor); for anything on the figure path, `corpus-prover` A/B on a pinned window shows identical output. - One file, one responsibility, ~200 lines; small functions; names that say what. - Dependencies point inward; `internal/` never imports `plugin/` or `ee/` (depguard). - No new abstraction for a need that does not exist; no TODO left behind; comments kept only where they state a constraint the code cannot show. - `make docs` afterwards: a moved command or flag changes the generated reference. Finish with `bash .claude/checks/gate.sh`, then `/review diff` with the go-reviewer's file-size and single-responsibility judgement stated explicitly.