phase 1: copy Kindred-only files onto upstream/main (FreeCAD 1.2.0-dev)

Wholesale copy of all Kindred Create additions that don't conflict with
upstream FreeCAD code:

- kindred-icons/ (1444 Catppuccin Mocha SVG icon overrides)
- src/Mod/Create/ (Kindred Create workbench)
- src/Gui/ Kindred source files (FileOrigin, OriginManager,
  OriginSelectorWidget, CommandOrigin, BreadcrumbToolBar, EditingContext)
- src/Gui/Icons/ (Kindred branding and silo icons)
- src/Gui/PreferencePacks/KindredCreate/
- src/Gui/Stylesheets/ (KindredCreate.qss, images_dark-light/)
- package/ (rattler-build recipe)
- docs/ (architecture, guides, specifications)
- .gitea/ (CI workflows, issue templates)
- mods/silo, mods/ztools submodules
- .gitmodules (Kindred submodule URLs)
- resources/ (kindred-create.desktop, kindred-create.xml)
- banner-logo-light.png, CONTRIBUTING.md

docs/src/development/build-system.md

@@ -0,0 +1,72 @@
+# Build System
+
+Kindred Create uses **CMake** for build configuration, **pixi** (conda-based) for dependency management and task running, and **ccache** for compilation caching.
+
+## Overview
+
+- **CMake** >= 3.22.0
+- **Ninja** generator (via conda presets)
+- **pixi** manages all dependencies — compilers, Qt6, OpenCASCADE, Python, etc.
+- **ccache** with 4 GB max, zlib compression level 6, sloppy mode
+- **mold** linker on Linux for faster link times
+
+## CMake configuration
+
+The root `CMakeLists.txt` defines:
+- **Kindred Create version:** `0.1.0` (via `KINDRED_CREATE_VERSION`)
+- **FreeCAD base version:** `1.0.0` (via `FREECAD_VERSION`)
+- CMake policy settings for compatibility
+- ccache auto-detection
+- Submodule dependency checks
+- Library setup: yaml-cpp, fmt, ICU
+
+### Version injection
+
+The version flows from CMake to Python via `configure_file()`:
+
+```
+CMakeLists.txt (KINDRED_CREATE_VERSION = "0.1.0")
+    → src/Mod/Create/version.py.in (template)
+    → build/*/Mod/Create/version.py (generated)
+    → update_checker.py (imports VERSION)
+```
+
+## CMake presets
+
+Defined in `CMakePresets.json`:
+
+| Preset | Platform | Build type |
+|--------|----------|------------|
+| `conda-linux-debug` | Linux | Debug |
+| `conda-linux-release` | Linux | Release |
+| `conda-macos-debug` | macOS | Debug |
+| `conda-macos-release` | macOS | Release |
+| `conda-windows-debug` | Windows | Debug |
+| `conda-windows-release` | Windows | Release |
+
+All presets inherit from a hidden `common` base and a hidden `conda` base (Ninja generator, conda toolchain).
+
+## cMake/ helper modules
+
+The `cMake/` directory contains CMake helper macros inherited from FreeCAD:
+- **FreeCAD_Helpers** — macros for building FreeCAD modules
+- Platform detection modules
+- Dependency finding modules (Find*.cmake)
+
+## Dependencies
+
+Core dependencies managed by pixi (from `pixi.toml`):
+
+| Category | Packages |
+|----------|----------|
+| Build | cmake, ninja, swig, compilers (clang/gcc) |
+| CAD kernel | occt 7.8, coin3d, opencamlib, pythonocc-core |
+| UI | Qt6 6.8, PySide6, pyside6 |
+| Math | eigen, numpy, scipy, sympy |
+| Data | hdf5, vtk, smesh, ifcopenshell |
+| Python | 3.11 (< 3.12), pip, freecad-stubs |
+
+Platform-specific extras:
+- **Linux:** clang, kernel-headers, mesa, X11, libspnav
+- **macOS:** sed
+- **Windows:** pthreads-win32