loadResubmitSource credited GORM's soft-delete scope for refusing a
reaped event; the reaper deletes the row outright. createAndFanOut
claimed to be the only path that creates deliveries; per-delivery
replay creates one too.
New tests drive the resubmit route through the production router:
CSRF refuses a missing, malformed or foreign token; another user's
webhook and another webhook's event are 404; the rate limit refuses
once spent; and signed-out requests never reach that rate limit. The
handler refuses a signed-out request with the same redirect itself,
so keeping such requests off the budget is what RequireAuth adds.
Model: opus-5-5
