## Summary Follow-up to #1413. This fixes two issues found during the first production deploy of relay account-limit Slack alerts. The first issue was a false warning for a host whose displayed repo usage was far below the configured threshold. The claim queries now use the same `account_count / account_limit` ratio that the alert formatter displays, and the claim path also does a Go-side ratio check before it persists warning or recovery state. The second issue was delivery with large alert sets. The monitor can claim hundreds of due hosts at once, but a Slack Block Kit section has text size limits. Warning alerts are now split by both configured host count and rendered text size, so a large set of due hosts does not produce one oversized Slack message. ## Testing - `go test ./cmd/relay/... -count=1`