docs: initialize mdBook structure with stub pages and deployment workflow

- Add docs/book.toml with coal theme, repo link, and custom CSS
- Add docs/src/SUMMARY.md with navigation structure
- Create 16 content pages across guide/, architecture/, development/, reference/
- Add docs/theme/kindred.css with minimal sidebar overrides
- Add .gitea/workflows/docs.yml for auto-deploy on push to main
- Add docs/book/ to .gitignore

Pages are populated with real content from the codebase where possible.
Remaining pages have TODO markers for future content.

docs/src/reference/configuration.md

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+# Configuration
+
+## Silo workbench
+
+The Silo workbench stores its configuration in FreeCAD's parameter system under `User parameter:BaseApp/Preferences/Mod/KindredSilo`.
+
+### Environment variables
+
+| Variable | Default | Description |
+|----------|---------|-------------|
+| `SILO_API_URL` | `http://localhost:8080/api` | Silo server API endpoint |
+| `SILO_PROJECTS_DIR` | `~/projects` | Local directory for checked-out files |
+
+### FreeCAD parameters
+
+| Parameter | Type | Default | Description |
+|-----------|------|---------|-------------|
+| `ApiUrl` | String | (empty) | Silo server URL |
+| `FirstStartChecked` | Bool | false | Whether the first-start prompt has been shown |
+
+## Update checker
+
+Configuration lives in `User parameter:BaseApp/Preferences/Mod/KindredCreate/Update`.
+
+| Parameter | Type | Default | Description |
+|-----------|------|---------|-------------|
+| `CheckEnabled` | Bool | true | Enable/disable update checks |
+| `CheckIntervalDays` | Int | 1 | Minimum days between checks |
+| `LastCheckTimestamp` | String | (empty) | ISO 8601 timestamp of last check |
+| `SkippedVersion` | String | (empty) | Version the user chose to skip |
+
+The update checker queries the Gitea releases API at:
+```
+https://git.kindred-systems.com/api/v1/repos/kindred/create/releases
+```
+
+## Theme
+
+The default theme is **Catppuccin Mocha** (`KindredCreate.qss`). It is applied via the KindredCreate preference pack at startup.
+
+To switch themes, go to **Edit > Preferences > General > Stylesheet** and select a different QSS file.
+
+## Build presets
+
+See `CMakePresets.json` for available build configurations. The pixi tasks (`configure`, `build`, etc.) use these presets automatically.

docs/src/reference/glossary.md

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+# Glossary
+
+## Terms
+
+**BOM** — Bill of Materials. A structured list of components in an assembly with part numbers, quantities, and reference designators.
+
+**Catppuccin Mocha** — A dark color palette used for Kindred Create's theme. Part of the [Catppuccin](https://github.com/catppuccin/catppuccin) color scheme family.
+
+**Datum** — Reference geometry (plane, axis, or point) used as a construction aid for modeling. Not a physical shape — used to position features relative to abstract references.
+
+**FCStd** — FreeCAD's standard document format. A ZIP archive containing XML model trees, BREP geometry, thumbnails, and embedded data.
+
+**FileOrigin** — Abstract C++ interface in `src/Gui/` that defines a pluggable file backend. Implementations: `LocalFileOrigin` (filesystem) and `SiloOrigin` (database).
+
+**FreeCAD** — Open-source parametric 3D CAD platform. Kindred Create is based on FreeCAD v1.0.0. Website: <https://www.freecad.org>
+
+**Kindred Create** — The full application: a FreeCAD fork plus Kindred's addon workbenches, theme, and tooling.
+
+**Manipulator** — FreeCAD mechanism for injecting commands from one workbench into another's menus and toolbars. Used by ztools to add commands to PartDesign.
+
+**MinIO** — S3-compatible object storage server. Used by Silo to store binary `.FCStd` files.
+
+**OndselSolver** — Lagrangian constraint solver for the Assembly workbench. Vendored as a submodule from a Kindred fork.
+
+**Origin** — In Kindred Create context: the pluggable file backend system. In FreeCAD context: the coordinate system origin (X/Y/Z axes and planes) of a Part or Body.
+
+**pixi** — Conda-based dependency manager and task runner. Used for all build operations. Website: <https://pixi.sh>
+
+**Preference pack** — FreeCAD mechanism for bundling theme settings, preferences, and stylesheets into an installable package.
+
+**QSS** — Qt Style Sheet. A CSS-like language for styling Qt widgets. Kindred Create's theme is defined in `KindredCreate.qss`.
+
+**rattler-build** — Cross-platform package build tool from the conda ecosystem. Used to create AppImage, DMG, and NSIS installer bundles.
+
+**Silo** — Kindred's parts database system. Consists of a Go server, FreeCAD workbench, and shared Python client library.
+
+**SSE** — Server-Sent Events. HTTP-based protocol for real-time server-to-client notifications. Used by Silo for the activity feed.
+
+**Workbench** — FreeCAD's plugin/module system. Each workbench provides a set of tools, menus, and toolbars for a specific task domain.
+
+**ztools** — Kindred's unified workbench combining Part Design, Assembly, and Sketcher tools with custom datum creation and assembly patterns.
+
+## Repository URLs
+
+| Repository | URL |
+|------------|-----|
+| Kindred Create | <https://git.kindred-systems.com/kindred/create> |
+| ztools | <https://git.kindred-systems.com/forbes/ztools> |
+| silo-mod | <https://git.kindred-systems.com/kindred/silo-mod> |
+| OndselSolver | <https://git.kindred-systems.com/kindred/solver> |
+| GSL | <https://github.com/microsoft/GSL> |
+| AddonManager | <https://github.com/FreeCAD/AddonManager> |
+| googletest | <https://github.com/google/googletest> |