diff --git a/plans/abstractions.md b/plans/abstractions.md
index d68a17f9..feee89df 100644
--- a/plans/abstractions.md
+++ b/plans/abstractions.md
@@ -12,6 +12,13 @@ Anything short → _Watching_ (what's missing) or _Rejected_ (why).
 
 ## Last scan
 
+- **Date:** 2026-06-07 (radar loop, pass 21)
+- **Pass 21 — honest empty (3rd running).** content's new CvRDT work (crdt/crdt-tree) is
+  content-exclusive collaborative-editing; events recurrence-id + fed-sx outbox internals
+  are domain-deep, not cross-cutting. No new candidate. Active loops are building *inside*
+  their domains now; radar's next real triggers are **(a)** a new subsystem spawning or
+  **(b)** host-persist's durable adapter landing → unblocks the W4 acl/mod→persist/log
+  migration. Cadence lengthened to ~hourly until one fires.
 - **Date:** 2026-06-07 (radar loop, pass 20)
 - **Pass 20 — honest empty pass.** 3 new census recurrences since p17 (normalize/index ×2,
   query ×3) — all **name collisions** (same noun, domain-specific op), added to the table.