Add notification digests with ON CONFLICT DO UPDATE, migrations 00068-00070,
supplementimpact module (analyze → confirm → claim-aware split), and wire
coordinator/mutate hooks plus proposal_required digests.
A new recheck mark is posted into the actor's existing project session, and a downstream-impact event does the same. Asking about what a change affects still resolves to impact analysis.
Co-authored-by: Cursor <cursoragent@cursor.com>
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