Add claude docs

.claude/build.md

@@ -75,6 +75,37 @@ if(DUSK_TARGET_SYSTEM STREQUAL "psp")
 endif()
 ```
 
+## Embedding JS files (`dusk_embed_js`)
+
+Source: `cmake/modules/duskjs2c.cmake`
+
+The `dusk_embed_js()` CMake function embeds a `.js` source file as a
+C string constant in a generated header. It is used to ship script
+module code alongside the engine binary without a separate file load.
+
+```cmake
+dusk_embed_js(
+  TARGET   ${DUSK_LIBRARY_TARGET_NAME}
+  JS_FILE  path/to/mymodule.js
+  # NAME is optional; defaults to uppercase stem + "_JS"
+  # e.g. "mymodule.js" -> "MYMODULE_JS"
+  NAME     MY_CUSTOM_NAME
+)
+```
+
+The generated header is placed in
+`${DUSK_GENERATED_HEADERS_DIR}/<stem>_js.h` and defines:
+
+```c
+static const char MY_CUSTOM_NAME[]     = "... js source ...";
+static const size_t MY_CUSTOM_NAME_SIZE = sizeof(MY_CUSTOM_NAME) - 1;
+```
+
+Under the hood it calls `python -m tools.js2c` from the repo root.
+The header is generated at build time; include it in the `.c` file
+that registers the JS module, then pass `NAME` and `NAME_SIZE` to
+`jerry_eval()` (or the equivalent module load helper).
+
 ## Tests
 
 - Test files live in `test/` mirroring the `src/dusk/` structure.