docs: fill out compat, lvglh, and toolchain documentation

Replace placeholder content in doc/compat/, doc/lvglh/, and
doc/toolchain/ with comprehensive documentation derived from the
source files.

- compat: document Wasuro WASM VM compatibility shims
- lvglh: document LVGL v9.2.2 configuration, fonts, and patches
- toolchain: document all 13 build pipeline scripts

doc/toolchain/compile_docs.md

@@ -18,20 +18,6 @@ Builds the static documentation website from the Markdown files in the `doc/` di
 3. Runs `mkdocs build --strict` to generate the static site.
 4. Output is written to the `site/` directory at the project root.
 
-## Docker Usage
-
-The documentation site can also be built and served via Docker Compose:
-
-```bash
-# Live development server with hot-reload
-docker compose up docs
-
-# Static build only
-docker compose run docs build --strict
-```
-
-The development server listens on `http://localhost:8000`.
-
 ## Configuration
 
 The site is configured by `mkdocs.yml` in the project root. The navigation structure mirrors the `doc/` directory hierarchy.