Records the requested per-user daily digest (who emailed which investors +
email substance) as a post-Phase-1 backlog item. Notes the three build-shaping
constraints: the new outbound-SMTP dependency (no current send path), the
Spark-only / never-Claude analysis rule for the un-anonymized substance, and
the internal-digest exemption from the "agents draft, humans send" guardrail.
Keysat