Third-party notices

Diff Tools is GPL-3.0-or-later. Its direct runtime dependencies retain their own licences:

Package	Pinned version	Licence	Purpose
`@add-ideas/toolbox-contract`	0.3.0	Apache-2.0	Manifest validation
`@add-ideas/toolbox-helpers`	0.2.0	GPL-3.0-or-later	Shared local-first utility primitives
`@add-ideas/toolbox-shell-react`	0.3.0	Apache-2.0	Shared Toolbox shell
`@xmldom/xmldom`	0.9.12	MIT	Inert XML DOM parsing
`diff`	9.0.0	BSD-3-Clause	Bounded sequence alignment and unified patches
`lossless-json`	4.3.1	MIT	Exact-decimal JSON parsing and serialization
`papaparse`	5.7.0	MIT	CSV and TSV parsing
`react` / `react-dom`	19.2.8	MIT	User interface

Release artifacts include the complete licence texts collected from every locked runtime package at LICENSES/npm-runtime-licenses.txt.