Under the hood
Useful1 Signal1
The design-canvas setup script is now a real file next to its HTML template.
What's wrong with this entry?
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seed-canvas.mjs
What
The design-canvas skill's setup script was an inline string and is now a separate file alongside its HTML template, exposed to the skill as payload.template.html and seed-canvas.mjs. The unreadable-payload failure reports the same event and shows the same message as before.
Evidence
design canvas: editor payload unreadable
Strings lifted out of the shipped bundle, so the claim above can be checked against them.