fix: editor

tasks/asteroid-splitting/CLAUDE.md

@@ -124,11 +124,10 @@ The editor adjusts the **scale and rotation** of asteroid images in each section
 
 ### Data flow
 
-- Editor reads `.template.html` (via EditorCore)
-- On load, fetches `.data.json` and applies transforms to DOM (`img.style.transform`)
-- On Save, reads transforms FROM DOM → sync XHR POST → server writes `.data.json`
+- Editor reads `.template.html` (via EditorCore) and `.data.json` (via `onDataLoaded`)
+- On load, applies saved transforms to DOM (`img.style.transform`)
+- Original transforms stored in Map for change detection and reset
+- On Save, serializes transforms from DOM → async POST via EditorCore → server writes `.data.json`
 - `generate.mjs` reads `.data.json`, applies `style="transform: ..."` to img elements in `.output.html`
 
-### Status: BROKEN
-
-The editor has a reliability problem with the save cycle. The server's save endpoint runs `generate.mjs` asynchronously after writing `data.json`. `generate.mjs` writes `.output.html`, which triggers browser-sync live-reload. The reload can interfere with the save flow, causing data loss or incomplete saves. This needs to be investigated and fixed before the editor can be used reliably.
+This editor serves as the **reference implementation** for building new task-type editors (see root CLAUDE.md "Building a New Editor").