Add grant reports for February

- Improve C++ API documentation
- Research Variant Parts
- Improve User Experience VarSets

Author: pieterhijma

reports/improve-c++-api-docs/pieterhijma-2025-02.md

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+## Summary of Activities - Improve C++ API Documentation - February 2025
+
+This work has not had activity this month.  I will pick up this project in March.

reports/improve-ux-varsets/pieterhijma-2025-02.md

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+## Summary of Activities - Improve User Experience VarSets - February 2025
+
+This project has not had activity this month.  I will pick this up in March.

reports/research-variant-parts/pieterhijma-2025-02.md

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+## Summary of Activities - Research Variant Parts - February 2025
+
+- Computing Shapes for Variants
+- Improving the view provider
+- Reporting
+
+### Computing Shapes
+
+This was the core of the project and has been completed in a satisfying way by
+means of intercepting property access.  This makes sure that computing a shape
+of a document object does not affect the document object itself by means of
+setting up a stack of "contexts" as an alternative memory for computing shapes.
+
+### Improving the view provider
+
+This was mainly to have GUI support to be able to show the functionality in a
+satisfying way.
+
+### Reporting
+
+The project has been reported in various ways:
+- A forum topic in [Open Discussion](https://forum.freecad.org/viewtopic.php?t=91325)
+- A forum topic in the [Developers corner](https://forum.freecad.org/viewtopic.php?t=91537)
+- A [discord channel](https://discord.com/channels/870877411049357352/1298197289357021204)
+
+Many videos have been created with explanation in general and in this month I
+created [a video of a
+propotype](https://forum.freecad.org/viewtopic.php?p=812021#p812021) and [one
+with more advanced
+configurations](https://forum.freecad.org/viewtopic.php?p=813545#p813545).
+
+Finally, I created a presentation for the Sunday 2 March Developer meeting that
+I report on in [this
+post](https://forum.freecad.org/viewtopic.php?p=814501#p814501).
+
+The prototype code has been submitted in three (stacked) PRs:
+
+- [#18412 Core: Allow exposing properties](https://github.com/FreeCAD/FreeCAD/pull/18412)
+- [#19733 Core: Compute shapes for variants](https://github.com/FreeCAD/FreeCAD/pull/19733)
+- [#19735 Gui: Add Part variant logic](https://github.com/FreeCAD/FreeCAD/pull/19735)
+
+Please note that although the proposal stated that I would submit multiple
+alternatives for each phase, the alternatives were vastly less viable than
+expected.  Hence, only one option was implemented for each phase, essentially
+the only viable one.  The PRs are all draft and are only meant to show the
+prototype.  If we ever want to build on these ideas, I would propose to build
+on them and implement all corner cases as well.  In that case, the structure of
+the PR will probably change, most likely splitting up the PRs into smaller
+incremental steps.
+
+### Concluding remarks
+
+I consider this project now finished and all the reporting on this project has
+been indexed in [this
+post](https://forum.freecad.org/viewtopic.php?p=814501#p814501).  A next step
+is to investigate to define a FreeCAD Enhancement Proposal for this work.