diff --git a/docs/NEXT-SESSION.md b/docs/NEXT-SESSION.md
index e11c184..fa25761 100644
--- a/docs/NEXT-SESSION.md
+++ b/docs/NEXT-SESSION.md
@@ -1,4 +1,4 @@
-# Where this left off — 2026-09-14
+# Where this left off — 2026-09-14 (addendum 2026-09-18 at the end)
 
 Nine days, ~20 commits, and every item on the last handoff's open list is
 closed or explained. The platform is in the best-measured state it has been
@@ -86,7 +86,9 @@ guessed family.
 
 ### Infra
 
-- **ZeroClaw v0.8.5** merged into the fork and deployed. No regressions.
+- **ZeroClaw v0.8.5** merged into the fork and deployed — to the persistent
+  runtime only, it turned out; see the 09-18 addendum. Missions reached it on
+  2026-09-18.
 - **Prod was off the tailnet for a day.** Tailscale node-key expiry on
   gw-01/02/04 — staggered by enrolment date, which is the tell. Re-authed,
   key expiry disabled on all five Hetzner nodes, `<node>-pub` aliases in
@@ -149,3 +151,38 @@ guessed family.
 - Marking more skills `always_inject`. See above.
 - The mission executor swap; a tap for the direct-session tier; `cm-brain`
   offline tests — unchanged from prior handoffs.
+
+## Addendum — 2026-09-18
+
+**Every version claim above was about the wrong container.** Missions are
+created from `CLAWMATES_RUNTIME_IMAGE`, which pointed at
+`clawmates-runtime:hooks` (zeroclaw 0.8.4, Claude Code 2.1.237, built 08-21)
+on both stacks until today. The v0.8.5 image only ever ran the persistent
+`clawmates-runtime`, which container-tier missions do not drive turns through.
+Every measured mission this month ran on `:hooks`. The comparisons stand — one
+image throughout — but "no regressions from v0.8.5" and "attribution survives
+2.1.263" described a container missions never touched. Memory corrected.
+
+Now: prod missions run `clawmates-runtime:v085-cc276` (zeroclaw 0.8.5 /
+Claude Code 2.1.276 / Kimi 0.41.0), set in `/opt/clawmates/.env`; local runs
+`:toolchain` from the same lineage. The Dockerfile pins both CLIs as ARGs —
+2.1.265 and 2.1.275 each broke every turn on `ANTHROPIC_BASE_URL` endpoints,
+so floating was never safe. Verified by two local canaries and prod mission
+`01a0b58e`: arguments on 82/82 calls, 3 spawns → 52 attributed subagent calls,
+gate, skill reads, judge independent first pass. Rollback is one line in
+`.env` back to `:hooks` (backed up beside it) and a server recreate.
+
+**Egress is closed.** Missions egress from `clawmates_missions` (172.25/16,
+`869c3ad`); `clawmates-egress.sh` on gw-04 drops tailnet/private/link-local/ssh
+for that subnet in `mangle PREROUTING --ctstate NEW`, survives docker and
+tailscaled restarts, and was verified from inside a real mission container.
+The server keeps the tailnet. `MISSION-EGRESS.md` has the two wrong turns.
+
+**Also:** `docker-compose.override.yml` is tracked; `DELETE /api/missions`
+removes `_outputs/<id>`; prod and local were wiped to zero on 09-14 (the runs
+above are the only missions since, all ours).
+
+**Check the MISSION container's binaries** (`docker exec cm-runtime-mission-…
+claude --version`), never the persistent runtime's, before attaching a version
+to a measurement.
+