fix(relay): stop held webhook deliveries when the inbox is cleared (#18838)

Co-authored-by: SAPHID <saphid@users.noreply.github.com>
Co-authored-by: GPT-6.1 Sol <noreply@openai.com>
cffcb76986Alex Southwell committed on 10/18/2026, 7:17:48 PM· committed by GitHubparentad2ac0f
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