BriefStore.load() now treats a 404 from GET /brief as "no brief exists
yet" and calls the existing reset() command once, instead of showing
the generic load-failed error. BriefAdapter.load() gains a
BriefLoadFailure error channel (notFound | error) so the store can
tell a 404 apart from every other failure; every other adapter method
stays on runSubmit, unchanged.
The once-only bound is a field on the store, not a comment: a second
404 (from a later load() call) always falls through to the ordinary
error path, and the recovery path never calls load() again, so no
loop can form.
This is the expand half of CQ-007's split (04-cqrs-light.md). Today's
backend never 404s GET /brief, so the new branch is dead code until
RB-23 (the backend contract half) ships in a later merge.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
ehoandClaude Opus 5
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