Add workshop notes

Workshops/2026-05/README.md

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 https://github.com/ESMValGroup/Community/discussions/273
 provides more information about this workshop.
+
+The [workshop notes](workshop_notes.md) summarise the presentations and discussions.

Workshops/2026-05/workshop_notes.md

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+# Hybrid ESMValTool Workshop – Meeting Notes
+**11–13 May 2026 (Exeter & Hybrid)**
+
+These notes were generated by Copilot, based on workshop transcripts
+---
+
+# **11 May 2026 – Day 1 (Monday)**  
+### **Morning – Conference room 3 (Chair: Birgit Hassler)**
+
+## **Introduction, welcome and workshop agenda (Alistair Sellar)**
+- Slides: [welcome_esmvaltool_workshop_May2026.pdf](welcome_esmvaltool_workshop_May2026.pdf)  
+
+---
+
+
+
+## **Demo: how to run ESMValTool with (fake) CMIP7 data (Bouwe Andela)**
+- The discussion included practical aspects of configuring and running ESMValTool with CMIP-style datasets.  
+- Participants discussed how configuration files can be copied and adapted locally to control data access and workflow behaviour.  
+- There was emphasis on flexibility in setting data paths and tailoring configurations to different environments.  
+- Questions focused on how to manage local versus external data sources and how configuration choices affect execution.  
+
+---
+
+## **Pixi introduction and demo (Valeriu Predoi)**
+- The discussion included how configuration environments are initialised and managed within ESMValTool workflows.  
+- Participants discussed how environment variables and configuration files interact to define runtime behaviour.  
+- Demonstrations showed how default configurations can be modified and extended for specific use cases.  
+- Questions centred on understanding how configuration layers are applied and how users can override defaults.  
+
+---
+
+
+
+# **12 May 2026 – Day 2 (Tuesday)**  
+### **Morning – Conference room 3 (Chair: Ranjini Swaminathan)**
+
+
+
+## **CMIP7 data – Changes from CMIP6; REF status and plans**
+- Slides: [CMIP7_data_ESMValTool_12may_MattMiz.pdf](CMIP7_data_ESMValTool_12may_MattMiz.pdf)  
+- Slides: [RapidEvaluationFramework_ESMValTool_Exeter_May2026.pdf](RapidEvaluationFramework_ESMValTool_Exeter_May2026.pdf)  
+- The session provided an overview of changes to CMIP7 data infrastructure, including updates to ESGF indexing and publication workflows.  
+- Participants discussed new requirements for metadata, grid definitions, and model documentation.  
+- The discussion included approaches to data preparation using tools such as CMOR and updated workflows for publishing compliant datasets.  
+- Quality control processes were presented, including validation of metadata and optimisation of files through repacking.  
+- The Rapid Evaluation Framework (REF) was introduced, including its diagnostic collections and dashboard interface.  
+- Participants discussed how REF outputs can be explored and interpreted.  
+
+---
+
+## **ESMValTool consortium updates (Alistair Sellar)**
+- Slides: [esmvaltool_consortium.pdf](esmvaltool_consortium.pdf)  
+- The discussion included an overview of the ESMValTool consortium and its governance structure.  
+- A Contributor License Agreement (CLA) was introduced as part of the contribution process.  
+- Participants discussed the purpose of the CLA and how it applies to contributors.  
+- A demonstration of the CLA signing process was provided.  
+
+---
+
+## **Styles planned for IPCC AR7 figures (Katja Weigel)**
+- Slides: [2026-05-12-ESMValToolWorkshop_IPCC_AR7_Figs.pdf](2026-05-12-ESMValToolWorkshop_IPCC_AR7_Figs.pdf)  
+- The session presented resources for IPCC AR7 figure design, including colour maps and graphical elements.  
+- Participants discussed how these resources could be incorporated into ESMValTool outputs.  
+- The discussion included how standardisation of visual elements could support consistent presentation of results.  
+
+---
+
+
+
+# **13 May 2026 – Day 3 (Wednesday)**  
+### **Morning – Conference room 3 (Chair: Axel Lauer)**
+
+
+
+## **Configuring data sources and cloud-native formats (Bouwe Andela)**
+- The discussion covered emerging support for cloud-native data formats and object storage.  
+- Participants discussed accessing data remotely using catalogues and avoiding full local downloads of large datasets.  
+- Examples included the use of formats such as Zarr and approaches to handling large-scale datasets efficiently.  
+- The discussion included how data discovery differs between local file systems and cloud-based services.  
+- Performance considerations and trade-offs between local and remote data access were also discussed.  
+
+---
+
+## **ESMValTool strategy – plans for a journal article (Birgit Hassler)**
+- The discussion outlined plans for an overview paper describing the evolution and capabilities of ESMValTool.  
+- Participants discussed positioning the paper as a high-level overview rather than a detailed technical description.  
+- Topics included sustainability, community engagement, and the role of ESMValTool in CMIP7 and IPCC activities.  
+- Considerations were raised regarding publication venues and open access requirements.  
+
+---
+
+## **Technical update (Valeriu Predoi)**
+- The discussion included updates on technical developments related to data handling and workflow execution.  
+- Participants discussed improvements in data access mechanisms and support for new data formats.  
+- The session highlighted how ongoing technical changes affect usability and performance.  
+
+---
+
+## **Discussion: managing recipes for CMIP6/CMIP7 and obs data**
+- The discussion included strategies for managing recipes across multiple CMIP generations.  
+- Participants discussed differences in variable naming conventions, time ranges, and dataset structures between CMIP6 and CMIP7.  
+- Approaches such as using test data and maintaining flexible configurations were considered.  
+- Broader issues related to organisation of observational data and storage practices were also discussed.  
+
+---
+