M14.4: scripting with an After Effects-style JavaScript object model

New crate effectcraft-script (L4): boa runtime with app/Project/CompItem/
Layer/PropertyGroup/Property/TextDocument/MarkerValue/RenderQueue/File
object model over engine commands (undoable, undo groups), AE match-name
table, file/network security gate. Entry points: script.run command,
File > Scripts > Run Script File (.jsx/.js), Window > Script Console,
effectcraft-cli script, MCP run_script. Engine: project.delete/duplicate,
prop.renameGroup/setGroupEnabled/removeGroup/duplicateGroup/moveGroup.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

xtask/src/main.rs

@@ -39,6 +39,7 @@ const LAYERS: &[(&str, u8)] = &[
     ("lottie", 3),
     ("format", 3),
     ("engine", 4),
+    ("script", 4),
     ("host", 4),
     ("ui-egui", 5),
     ("automation", 5),
@@ -63,6 +64,8 @@ const SAME_LAYER: &[(&str, &str)] = &[
     ("gpu", "render"),
     ("lottie", "format"),
     ("host", "engine"),
+    ("script", "engine"),
+    ("host", "script"),
     ("cli", "effectcraft"),
 ];