Opt-in discord.approval_mentions (config.yaml, bridged to
DISCORD_APPROVAL_MENTIONS) prepends <@id> mentions for numeric
allowlist entries to exec-approval prompts, with a scoped
AllowedMentions override (users only). Default off - no surprise
pings. Reapplied onto the content-mirror layout from #60245: mentions
prepend to the visible content block and its truncation budget.
Original implementation from PR #39719; commits arrived bot-authored,
re-attributed to the contributor.
e0176cbd47