## 1. License file

- [x] 1.1 Create `LICENSE` at repo root with the WTFPL v2 body and a single `Copyright (C) 2026 kotoyuuko` line as the sole copyright attribution (exact body in design.md §2)
- [x] 1.2 Verify the file has no trailing whitespace and ends with a newline

## 2. README

- [x] 2.1 Append a `## License` section to `README.md` immediately after the existing `## API` section, with a one-line blurb linking to the `LICENSE` file

## 3. Verification

- [x] 3.1 Confirm `go build ./...` and `go test ./...` still pass (no code changed, should be trivially green)
- [x] 3.2 Spot-check the file at the repo root (`ls LICENSE`, preview first 5 lines)