Add contribution statement and checking

.github/workflows/cla-check.yaml

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+name: Legal
+
+on:
+  pull_request_target:
+
+jobs:
+  cla:
+    uses: MetOffice/growss/.github/workflows/cla-check.yaml@main
+    with:
+      runner: 'ubuntu-24.04'
+      cla-url: 'https://github.com/MetOffice/Momentum/blob/main/CLA.md'

CONTRIBUTING.rst

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+Contributing to Fab
+###################
+
+Anyone is welcome to contribute to the "Fab" project, provided they conduct
+themselves in good faith and with respect for all.
+
+
+Support Requests
+================
+
+If you need help with something, please make use of the "Discussions" tab on
+the GitHub project page. Do not jump straight to raising an issue, it may be
+that your problem is easily answered by the community and does not require
+changes to the code.
+
+
+Raising Bug Reports and Feature Requests
+========================================
+
+Bug reports and feature requests may be raised using the "Issues" tab, but
+before you do, please check there isn't a similar closed issue. Also check
+the "Discussion" tab to see if someone has already come across what you have
+found.
+
+
+Contributions
+=============
+
+Contributions may be made by raising a pull request against the
+`main branch`_. You will need a personal fork of the repository to host your
+development branch.
+
+If this is your first contribution, you will need to agree to the `contributor
+agreement`_ and your branch will need to include the addition of your details
+to the the ``CONTRIBUTORS.md`` file.
+
+.. _main branch: https://github.com/MetOffice/fab
+.. _contributor agreement: https://github.com/MetOffice/Momentum/blob/main/CLA.md

CONTRIBUTORS.md

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+# Contributor List
+
+If this is your first contribution, you will need to agree to the
+[Momentum Open Source Software Contributor Agreement](https://github.com/MetOffice/Momentum/blob/main/CLA.md)
+. A copy of v1.0 is provided [below](#momentum-open-source-software-contributor-agreement) for convenience but the version linked
+above always takes precedence.
+
+To indicate your agreement, add your details to the the following table.
+
+If you are not submitting contributions on behalf of an organisation please use
+"n/a" for your affiliation.
+
+| GitHub Username | Real Name       | Affiliation |
+|-----------------|-----------------|-------------|
+| MatthewHambley  | Matthew Hambley | Met Office  |
+
+---
+
+## Momentum Open Source Software Contributor Agreement
+
+Thank you for your interest in contributing to the Momentum Open Source Software
+Components, which are managed by the Met Office.
+
+In order to clarify the intellectual property rights granted with Contributions
+from any person or entity, the Met Office must have a Contributor Agreement
+("**CA**" or "**Agreement**") that has been accepted by each contributor,
+indicating agreement to the terms below. Each contributing individual within a
+contributing organisation must personally sign the CA form.
+
+This CA is for your protection as a contributor as well as the protection of the
+Momentum Open Source Software Components and its users.
+
+**To sign the CA, please enter your details in the `CONTRIBUTORS.md` file
+located in the software repository. By adding your details, you confirm your
+agreement to the terms of this CA. Once agreed, this constitutes a legally
+binding agreement between You and the Met Office.**
+
+The Met Office will collect, use, and process your Personal Data to support the
+development of the Momentum Open Source Software Components, maintain records of
+Contribution ownership, and document the signing of the CA. Your Personal Data
+will be processed in accordance with the Met Office
+[Privacy Policy](https://www.metoffice.gov.uk/about-us/legal/privacy) and the UK
+and European Data Protection Laws (the DPA, the Data Protection Regulation
+(Regulation (EU) 2016/679) and the Law Enforcement Directive (Directive (EU)
+2016/680)). The legal basis for processing is **contractual necessity**, as set
+out in the
+[Privacy Policy](https://www.metoffice.gov.uk/about-us/legal/privacy). Personal
+Data processed by the Met Office will not be disclosed to third parties for
+marketing purposes. Your GitHub username will be published on a public website
+in order to permit Developers of Momentum Open Source Software Components to
+ascertain that Your Contribution is covered by a signed CA. Your Personal Data
+will be stored on a GitHub repository managed by the Met Office and may be
+transferred to another system. This may therefore result in the data leaving the
+UK / European Economic Area. For further information, please see
+[GitHub Privacy Policy](https://docs.github.com/en/site-policy/privacy-policies/github-general-privacy-statement).
+
+To end this Agreement please contact <Scientific_Partnerships@metoffice.gov.uk>.
+This will result in your GitHub username being removed from the public list of
+CA signees and will prevent further Contributions from You being accepted into
+Momentum Open Source Software Components. Please be aware that for the purpose
+of recording previous agreements covering Your existing Contributions, it is not
+possible to withdraw the signed agreements from the historical archive. This
+does not affect your rights as a data subject, as set out in the
+[Privacy Policy](https://www.metoffice.gov.uk/about-us/legal/privacy).
+
+You accept and agree to the following terms and conditions for Your past,
+present and future Contributions submitted to the Momentum Framework. In return,
+the Met Office shall not use Your Contributions in a way that is contrary to the
+interests of users of the Momentum Open Source Software Components.
+
+**1. Definitions and interpretation**
+
+1.1 Save where the context requires otherwise, the definitions and rules of
+interpretation in this **Clause 1** apply to this Agreement.
+
+"**You**" (or "**Your**") shall mean the copyright owner or legal entity
+authorised by the copyright owner that is making this Agreement with the Met
+Office. For legal entities, the entity making a Contribution and all other
+entities that control, are controlled by, or are under common control with that
+entity are considered to be a single contributor.
+
+For the purposes of this definition, "**control**" means (i) the power, direct
+or indirect, to cause the direction or management of such entity, whether by
+contract or otherwise, or (ii) ownership of fifty percent (50%) or more of the
+outstanding shares, or (iii) beneficial ownership of such entity.
+
+"**Contribution**" shall mean any original work of authorship, including any
+modifications or additions to an existing work, that is intentionally submitted
+by You to the Momentum Open Source Software Components. For the purposes of this
+definition, "**submitted**" means any form of electronic, verbal, or written
+communication sent to Momentum Consortium and/or the Met Office or their
+representatives or members, including (but not limited to) communication on
+electronic mailing lists, source code control systems, and issue tracking
+systems that are managed by, or on behalf of, the Momentum Consortium for the
+purpose of discussing and improving the Momentum Framework, but excluding
+communication that is conspicuously marked or otherwise designated in writing by
+You as "**Not a Contribution**".
+
+"**Met Office**" shall mean the Met Office, an Executive Agency of the
+Department for Science, Innovation and Technology of the United Kingdom of Great
+Britain and Northern Ireland ("**DSIT**"), whose principal place of business is
+situated at FitzRoy Road, Exeter, Devon EX1 3PB, United Kingdom, for and on
+behalf of DSIT.
+
+"**Met Office Proprietary Software Components**" shall mean the Momentum
+software components owned and licensed by the Met Office on a proprietary basis.
+
+"**Momentum Framework**" shall mean the Unified Earth Environment Prediction
+Framework components collectively, consisting of the Met Office Proprietary
+Software Components, the Momentum Open Source Software Components and the
+science configurations. The various Momentum Framework components are used to
+build prediction systems for weather and climate.
+
+"**Momentum Consortium**" shall mean the consortium which was established by the
+Met Office and various other meteorological organisations to manage the
+development of Momentum.
+
+"**Momentum Open Source Software Components**" shall mean the software
+components distributed under the Momentum name and/or logo, licensed pursuant to
+any form of Open Source Software Licence.
+
+"**Open Source Software Licence**" shall mean any form of open-source software
+licence meeting the Open Source Initiative's open source definition from time to
+time (<https://opensource.org>).
+
+"**Parties**" shall mean the Met Office and You.
+
+"**Working Day**" shall mean a day other than a Saturday, Sunday or public
+holiday in England when banks in London are open for business.
+
+"**Personal Data**" shall have the meaning given in s.3 of the UK Data
+Protection Act 2018 ("**DPA**").
+
+1.2 Unless the context otherwise requires, words in the singular shall include
+the plural and in the plural include the singular.
+
+**2 Copyright Assignment**
+
+2.1 Pursuant to and for the consideration set out in this Agreement, and on the
+condition and understanding that Met Office Open Source Software Components will
+be licensed by the Met Office to the end users under an Open Source Software
+Licence, as set out in **Clause 3** of this Agreement, You hereby assign as a
+continuing obligation, into the name of the Met Office (on behalf of the
+Controller of His Majesty's Stationery Office and King's Printer), with full
+title guarantee ALL the copyrights in the Contribution, being the exclusive
+right to do and to authorise others to do any and all acts restricted by the
+Copyright, Designs and Patents Act 1988 in relation to the Contribution in the
+United Kingdom together with copyright and all other rights in all other
+countries of the world (and/or any similar rights in countries where such rights
+exist) for the whole term of such rights including extensions or renewals of
+such rights and including the right to sue for damages and other remedies in
+respect of infringements or any other cause of action arising from ownership of
+any of these assigned rights in the Contribution, whether occurring before, on,
+or after the date of this Agreement, TO HOLD unto the Met Office (on behalf of
+the British Crown) absolutely.
+
+2.2 If moral rights apply to Your Contribution, to the maximum extent permitted
+by law, You waive, and if waiver is not possible, agree not to assert, such
+moral rights against the Met Office or any of the Met Office's licensees, either
+directly or indirectly.
+
+2.3 To ensure the integrity, quality, applicability and usefulness of the
+Momentum Framework, the Met Office has strict vetting procedures in relation to
+Contributions to the Momentum Framework, so not all Contributions will be
+included as part of Momentum Open Source Software Components. Accordingly, You
+acknowledge that the Met Office is not obliged to use Your Contribution or any
+part of it.
+
+**3 Outbound Licence**
+
+3.1 The Met Office agrees, in consideration of Your grant of rights to the Met
+Office under **Clause 2** of this Agreement, to license Your Contribution (as
+part of the Momentum Open Source Software Components) under the terms of the
+[BSD 3-clause licence](https://opensource.org/licenses/BSD-3-Clause), or another
+similar permissive Open Source Software Licence, as may be decided by the Met
+Office.
+
+3.2 Full details of the licence specified for the Momentum Open Source Software
+Components owned by the Met Office can be found in the LICENCE file of Momentum
+Open Source Software Components' source code repository.
+
+3.3 You agree and acknowledge that the Met Office may license and distribute
+your Contributions under any subsequent version of the licence specified for the
+Momentum Open Source Software Components. Furthermore, You agree that the Met
+Office may change the licence from time to time to an alternative permissive
+Open Source Software Licence from the list maintained by the
+[Open Source Initiative](https://opensource.org/) in order to suit the evolution
+of Momentum.
+
+**4 Warranties**
+
+4.1 You warrant that:
+
+4.1.1 You own the copyright in the Contribution Submitted by You and that You
+can legally grant the rights set out in this Agreement;
+
+4.1.2 the details recited above are correct and agree to execute, sign and do,
+and procure on the part of the authors the execution, signing and doing of all
+such further documents, acts, and things as the Met Office (on behalf of the
+British Crown) may require to vest fully in it the full legal title to and
+benefit of the copyright in the Contribution.
+
+4.1.3 to the best of your knowledge and belief, Contribution Submitted by You
+does not and will not violate third party copyrights, trade marks, patents or
+other intellectual property rights.
+
+4.2 You agree to notify the Met Office if You become aware of any circumstance
+which would make any of the warranties made in **Clause 4.1** inaccurate in any
+respect.
+
+**5 Acknowledgement**
+
+5.1 The Met Office acknowledges that the Contribution Submitted by You is free
+of charge and is made for the benefit of the Momentum Consortium and the
+Momentum Framework as a whole. Accordingly, the Met Office acknowledges that,
+save for the warranties set out in **Clause 4** above (which are necessary to
+enable the provenance of Momentum to be properly established), it accepts that
+all Contributions Submitted by You are "as is", without any express or implied
+warranties of any kind.
+
+5.2 For the avoidance of doubt, as stated in **Clause 2.3** above, the Met
+Office need not incorporate the whole or any part of Your Contribution in the
+Momentum Framework components.
+
+**6 Intellectual property rights infringement**
+
+If any third party makes any claim against You or any other entity, alleging
+that your Contribution, or the work to which you have contributed, infringes the
+intellectual property rights of that third party, then You shall inform the Met
+Office within five (5) Working Days of such claim in order for the Met Office to
+take all appropriate action it deems necessary in relation to the claim.
+
+**7 Legal entitlements**
+
+You represent that you are legally entitled to assign the rights in your
+Contribution. If your employer(s) holds rights to intellectual property that you
+create that includes your Contributions, you represent that you have received
+permission to make Contributions on behalf of that employer, or that your
+employer has waived such rights for your Contributions to the Momentum Open
+Source Software Components.
+
+**8 Contribution of Your creation(s)**
+
+You represent that each of Your Contributions is Your original creation and that
+you have not assigned or otherwise given up your interest in the Contribution to
+any third party. You represent that Your Contribution submissions include
+complete details of any third-party licence or other restriction (including, but
+not limited to, related patents and trade marks) of which you are personally
+aware and which are associated with any part of Your Contributions.
+
+**9 Notification**
+
+You agree to notify the Met Office of any facts or circumstances of which you
+become aware that would make these representations inaccurate in any respect.
+You further agree to fully indemnify, and keep indemnified, the Met Office
+against any losses suffered as a result of any fraudulent or negligent
+misrepresentation made by you under **Clauses 7** or **8.**
+
+**10 Dispute resolution**
+
+10.1 The Parties shall attempt in good faith to negotiate a settlement to any
+dispute arising between them out of or in connection with this Agreement within
+thirty (30) Working Days of the dispute arising.
+
+10.2 If the dispute cannot be resolved, then the Parties shall attempt to settle
+it by mediation in accordance with the Centre for Effective Dispute Resolution
+("**CEDR**") Model Mediation Procedure from time-to-time in force.
+
+10.3 To initiate the mediation a party to the Agreement must give notice in
+writing (the "**ADR Notice**") to the other party requesting mediation in
+accordance with this clause.
+
+**11 Mediation**
+
+11.1 The mediation is to take place not later than thirty (30) Working Days
+after the ADR Notice is received. If there is any issue concerning the conduct
+of the mediation upon which the Parties cannot agree within fourteen (14)
+Working Days of the ADR Notice being received, then CEDR shall, at the request
+of either party, decide the issue for the Parties, having consulted with them.
+
+11.2 Unless otherwise agreed, all negotiations connected with the dispute and
+any settlement shall be conducted in confidence and without prejudice to the
+rights of the Parties in any future proceedings.
+
+11.3 If the Parties reach agreement on the resolution of the dispute, the
+agreement shall be reduced to writing and shall be binding on the Parties once
+it is signed by both You and the Met Office.
+
+11.4 If the Parties fail to reach agreement within sixty (60) Working Days of
+the initiation of the mediation, or such longer period as may be agreed by the
+Parties, then any dispute or difference between them may be referred to the
+courts.
+
+11.5 Nothing in this Agreement affects the right of You or the Met Office to
+apply to the court for urgent interim equitable relief (including, but not
+limited to, an injunction).
+
+**12 General**
+
+12.1 For the purposes of clarity: this Agreement constitutes a contract for
+copyright assignment and for a grant of licence, and not a contract of
+employment.
+
+12.2 No waiver by either party of any of its rights under this Agreement shall
+release the other party from full performance of its other obligations stated
+herein.
+
+12.3 Nothing in this Agreement shall be deemed to constitute, evidence, or
+comprise a partnership between the Parties or to constitute either party the
+agent of the other.
+
+12.4 Neither party may assign its rights under this Agreement in whole or in
+part to any person, firm or company without the prior written agreement of the
+other party.
+
+12.5 No amendment, waiver, or variation, of this Agreement, whether in whole or
+in part, shall be binding on the Parties unless set out in writing and signed by
+or on behalf of the Parties by their duly authorised representatives.
+
+12.6 If any provision of this Agreement is held by a competent authority to be
+illegal, invalid, or unenforceable, whether in whole or in part, the validity of
+the remainder of the relevant provision and the remaining provisions shall not
+be affected or prejudiced.
+
+12.7 Each party shall, at its own cost and expense, from time to time do or
+procure the execution of all documents as may be reasonably necessary in order
+to give effect to the provisions of this Agreement.
+
+12.8 The Parties to this Agreement do not intend that any of its terms will be
+enforceable by any person not a party to it.
+
+12.9 This Agreement shall be governed by and construed in accordance with the
+laws of the England and Wales.
+
+12.10 The Parties irrevocably agree that the courts which are located in the
+United Kingdom shall, subject to **Clause 10** and **11**, have exclusive
+jurisdiction to settle any dispute or claim that arises out of, or in connection
+with, this Agreement or its subject matter or formation (including
+non-contractual disputes or claims).