FactorLasso source attribution and licensing scope

FactorLasso 1.0.4.post1 and subsequent source incorporating this notice are
distributed under the MIT License in LICENSE. Earlier published GPL artifacts
and their licence grants remain unchanged. The maintainer confirmed ownership
of the relevant first-party source and contributions before this transition.
Authorship and scholarly acknowledgements remain in the source and CITATION.cff.

The following first-party sibling adaptations retain their MIT attribution:

- OptimalPortfolios research references: factorlasso/inference/_ar1.py,
  _gaussian.py, _geometry.py and _validation.py; factorlasso/priors/_inference.py
  and _risk.py. Their original full MIT notices remain in each source file.
- OptimalPortfolios/tools/check_docs.py and QuantInvestStrats/tools/check_docs.py:
  tools/check_docs.py.
- OptimalPortfolios/tools/docs_analytics/registry.py, itself adapted from
  QuantInvestStrats/tools/docs_analytics/run.py: tools/docs_analytics/registry.py.
- QuantInvestStrats/docs/_ext/qis_indexing.py: docs/_ext/factorlasso_indexing.py.
- QuantInvestStrats/src/qis/tests/documentation_indexing_test.py:
  tests/test_docs_indexing.py.

The sibling source permission notice is reproduced below. These paths identify
source origins; tooling and tests need not be included in every distribution.

MIT License

Copyright (c) 2024 Artur Sepp

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.

Scope and separate material

The package licence applies to cleared first-party source and applicable
documentation, examples and synthetic fixtures. Third-party dependencies retain
their own licences. Vendor datasets and SDKs, manuscript versions and other
separately licensed material are not relicensed by this notice. Python wheels
and source distributions exclude the paper and agent workspaces. The separate
paper replication workspaces retain their recorded licensing terms.

References to mathematical methods, including uniLasso, are scholarly
attributions and are retained. No copied or translated implementation from grplasso, gglasso, glmnet or glasso
was identified in the reviewed release source;
the estimator expresses its optimisation problems through CVXPY. This finding
describes the reviewed source and is not a licence claim about those packages.
