diff --git a/FIX.org b/FIX.org
index 1d505a1..88a1e5d 100644
--- a/FIX.org
+++ b/FIX.org
@@ -220,3 +220,17 @@ Four agent lanes are running off the review, each in its own worktree:
 
 Tier 2 (install and shipping) was explicitly passed over. Package visibility is skipped in
 every lane — it needs a syntax decision from the author.
+
+** All four lanes merged, end of 2026-09-17 evening
+Tier 1 (runtime correctness + the runtime strays of Tier 4), Tier 3 (clock,
+libm, getenv, file verbs), Tier 4 (CLI arms, flags, CI, docs) and the JS
+dialect's first slice are all on dev-loop. Verified together: dune test
+--force 232/0, @x86 116 MATCH / 0 DIFFER, @js 0 DIFFER, @sanitize clean.
+
+Left for the author, recorded where each lives:
+- Package visibility needs a syntax decision (review Tier 4 item 5).
+- The v->gen word: spec-memory.md mandates it, nothing reads it; delete or
+  implement is a spec amendment (BUILT.md records the two options).
+- sand.flan:167 still holds the refused defconst experiment; the diagnostic
+  now prints in full and names the fix.
+- Tier 2 (install and shipping) deliberately not started.