New property cameleer.server.alerting.perExchangeDeployBacklogCapSeconds
(default 86400 = 24h, 0 disables). On first run (no persisted cursor
or malformed), clamp cursorTs to max(rule.createdAt, now - cap) so a
long-lived PER_EXCHANGE rule doesn't scan from its creation date
forward on first post-deploy tick. Normal-advance path unaffected.
Follows up final-review I-1 on the PER_EXCHANGE exactly-once phase.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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