MIT License

Copyright (c) 2026 Independent Heluo prototype contributors

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

PROVENANCE / SEPARATE SOURCE MATERIAL

Engine, tests, structured source fixtures, specification and original conditional
reflection wording are independently written. No Horosa code, data, translated
prose, AGPL implementation, modern fortune corpus or modern author commentary
was imported. The existing independently authored heluo subset and Yi engine
were inspected read-only; they are not runtime imports of this new engine.

Ancient rules are factual algorithm descriptions. The named source is the 1929
Wenming Shuju 河洛理數 scan from the National Library of China, shelfmark
MG/B221.5/22/:1-2, 279 PDF pages. Wikimedia Commons identifies this mechanical
scan as public domain. The 1929 publication is also older than 95 years in 2026.
The scan is research evidence, not new MIT-authored material; retain its source
and catalog link if redistributing it. This is a provenance statement, not a
warranty covering every jurisdiction or every potential editorial contribution.

Source PDF:
https://upload.wikimedia.org/wikipedia/commons/4/4a/NLC416-13jh000625-42999_%E6%B2%B3%E6%B4%9B%E7%90%86%E6%95%B8.pdf
Catalog/rights:
https://commons.wikimedia.org/wiki/File:NLC416-13jh000625-42999_%E6%B2%B3%E6%B4%9B%E7%90%86%E6%95%B8.pdf

No third-party library is bundled. Integration must retain the actual
lunar-javascript dependency's license and the existing independent Yi engine's
license. Transcriptions from modern websites were used only to locate and
compare primary rules; no full modern transcription corpus ships here.