diff --git a/docs/session-ledger.md b/docs/session-ledger.md
index 66eaae4..885062d 100644
--- a/docs/session-ledger.md
+++ b/docs/session-ledger.md
@@ -236,3 +236,21 @@
   entry -> commit+push; THEN the operator-gated apex --commit stays G12's next gated step.
 - Details: docs/changelog-20260721-g12-dc1-authoring.md (item 3 = drop-state record). Status
   lives ONLY in CURRENT-STATE.md.
+
+## SESSION CLOSE 2026-07-22 -- G12 dc1 build session (bounded, GA-R4)
+
+- Opened from the drop-state; predecessor's owed reconcile DELIVERED (six harnesses + two sighted
+  surfaces; gauntlet 76 ALL GREEN; landed as authoring-changelog item 4). Duplicate idle Claude
+  session checked at operator request -- already exited, nothing culled.
+- G12 [V] leg executed through the D-125 gate, every mutation operator-gated, all pushed:
+  apex --commit (transit /30 + rack IP, read-back idempotent); dc1 svc key minted (audit CLEAN);
+  outer step A 5/0/0 exact; cloudinit-vm interface_macs shipped + voffice1 dc1-transit NIC 0/2/0
+  (full MAC pins, post-bounce battery ALL PASS); transit .5<->.6 live; rack ENROLLED (nmpcq4) with
+  SEC-010 both ends + 26.7 base (hash-verified dc0 copy); inner step C 28/28 from voffice1 (one
+  fix-forward: serial-staging dir), 10/10 domains RUNNING, edge at the 26.7 login prompt; D-125
+  egress gate PASS (two identical runs). Queued findings: changelog items 7/9 (four tool gaps).
+- NEXT session: edge bootstrap (D-112(c) driver rebuild -- v6 + five measured lessons at
+  changelog-20260719-dc0-deploy-stepB.md:241-260; edge keypair mint first) -> API key -> v4
+  addressing -> rack standup DoD -> commissioning 9/9 -> G12 close-out; operator-gated merge to
+  main is the hard new-session gate after that.
+- Details: docs/changelog-20260722-g12-dc1-build.md (items 1-10). Status lives ONLY in CURRENT-STATE.md.