Treat a single source fetch failure as tolerated so campaigns can
continue fetching and transition normally.
The worker now records failed fetches and only propagates a process
error once the failed source count exceeds one. This keeps the first
failed source visible on the source fetch while preventing the
campaign-level run from being marked failed too early.
Signed-off-by: Cursor Agent <cursoragent@cursor.com>
Co-authored-by: Bryan FRIMIN <bryan@frimin.fr>
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