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_sourcelist.md

@@ -1 +1,32 @@
-# Placeholder
+# compile_sourcelist.sh
+
+Generates a list of all Pascal source files in the project.
+
+## Overview
+
+`compile_sourcelist.sh` scans the parent directory for all `.pas` files and writes their paths to `sources.list`. This file can be used by other tools or scripts that need a manifest of Pascal source files.
+
+## Prerequisites
+
+- `find` must be available.
+- Must be run from a subdirectory of the project root (it searches `..`).
+
+## Inputs
+
+The entire project directory tree (searched recursively for `*.pas` files).
+
+## Outputs
+
+| File | Description |
+|------|-------------|
+| `sources.list` | A newline-delimited list of absolute paths to all `.pas` files found. |
+
+## Behavior
+
+1. Uses `find` to locate all files matching `*.pas` in the parent directory.
+2. Writes the results to `sources.list` in the current working directory.
+3. Exits with code 0.
+
+## Notes
+
+- This script is not currently listed in the `compile.sh` build pipeline steps. It may be used as a standalone utility or by external tooling.