A redraft keeps the plan's id, so a plan the service worker answered from
its cache could pass for the finished rebuild. The API client's apiRead now
says whether a GET was the cached copy; the plan carries it, and the Draft
board shows the retryable draft-unread error instead of a cached plan with
the drafted id. A later read from the server still lands the draft.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>