diff --git a/plans/abstractions.md b/plans/abstractions.md
index 117dc7af..d4a62005 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 15)
+- **Pass 15:** added the **scanning-method note** above after `query.sx` again proved to
+  be merged-lib copies (lib/prolog + lib/persist in every worktree). Corrected census
+  surfaced `wire`×2 (content+mod) → Rejected (shared role, divergent structure: generic SX
+  serializer vs bespoke pipe-format under a Prolog-env string-prim constraint). events↔
+  commerce integration appeared (paid tickets); acl/mod/search quiescent ~7 passes (now
+  API-stable). No new gate-clearer.
 - **Date:** 2026-06-07 (radar loop, pass 14)
 - **Pass 14:** filename census flagged `snapshot`×?? — but the `*/lib/persist/snapshot.sx`
   copies are just the merged `lib/persist` in each worktree, NOT consumers (same artifact
@@ -90,6 +97,14 @@ Anything short → _Watching_ (what's missing) or _Rejected_ (why).
   (`lib/ocaml/baseline` only). Both early-stage, pre–Phase 2 → out of proposal scope.
 - Re-enumerate every pass; new loops (e.g. a future `commerce`/`identity`) auto-join.
 
+**Scanning-method note (learned the hard way, passes 5/12/14/15):** a filename census
+for *cross-subsystem* recurrence MUST restrict to each subsystem's OWN namespace —
+`X/lib/X/*.sx` — never `X/lib/*/`. The merged substrate libs (`lib/prolog`, `lib/persist`,
+`lib/feed`, `lib/datalog`, …) are checked out inside *every* worktree, so a naive census
+reports e.g. `query.sx`/`snapshot.sx`/`rank.sx` ×N as phantom recurrences that are really
+one merged file copied N times. Correct one-liner:
+`for w in <subsystems>; do for f in $w/lib/$w/*.sx; do basename $f .sx; done; done | sort | uniq -c | sort -rn`.
+
 ---
 
 ## Proposed (cleared the gate)
@@ -327,6 +342,14 @@ Anything short → _Watching_ (what's missing) or _Rejected_ (why).
   *builds a Scheme env*, search's api *concatenates a Haskell source string*, mod's is a
   *lifecycle state-machine façade* (17 defs vs persist's 1). Same role, no common shape —
   the W1 coincidental-resemblance trap. Do not re-propose on the filename.
+- **Shared `wire.sx` "serialization" module (×2).** Rejected pass 15: content + mod both
+  have a `wire.sx`, but `content/wire.sx` uses the **generic SX serializer**
+  (`serialize`/`parse`, full-fidelity round-trip) while `mod/wire.sx` is a **bespoke
+  versioned pipe-delimited line** (subset of fields, `split` hand-built over slice/len
+  because mod's Prolog-loaded env strips string prims). Shared role (wire format),
+  divergent structure + substrate constraint → not a candidate; the SX serializer is
+  already the shared tool for SX-substrate subsystems, and mod can't use it. (Same family
+  as the `api.sx` rejection above.)
 - **Dumping app-domain plumbing into `lib/guest`.** Rejected: `lib/guest` is for
   language-implementation plumbing. App patterns route to acl/fed-sx/persist/
   substrate/host instead (see the routing rule in the briefing).