make fmt-check, and therefore make lint, was already failing on main across 22 files before this branch of work. This applies `make fmt` and clears it. Whitespace only: alignment of struct tags and trailing comments, one over-long single-line function body split in list_test.go, and trailing blank lines stripped at EOF. Verified by confirming every file here is byte-identical to gofmt applied to its parent version, so the change is semantics-preserving by construction. go build and go vet are clean and make test-all still passes. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>