diff --git a/JOURNAL-conc.md b/JOURNAL-conc.md
index 53c79be..b7ef78a 100644
--- a/JOURNAL-conc.md
+++ b/JOURNAL-conc.md
@@ -97,3 +97,22 @@ All four commits: tests/unit 138 passed + lint PASS before each. Next: tests/con
   Leftover unheld lockfiles present by design (tidy-swept at next janitor).
 - (c) double-!testme on immich#2: two comments at 05:03:58Z → two custom builds, same run
   domain immi-ad3e33 → exactly one must block on the app lock with the visible log line.
+
+## 2026-06-10 — CONC-A1: (c) failure root-caused + fixed (run-keyed state files)
+
+- (c) round 1 = builds 279+281, both RED. Root cause (independently also found+filed by the
+  Adversary as CONC-A1 while I was mid-diagnosis — same conclusion from both loops): the four
+  run-scoped state files (deploys/opstate/deps/depskip) were DOMAIN-keyed in shared /tmp;
+  281's main()-preamble + pre-lock _record_deploy fired before it blocked on the app lock →
+  279 read deploy-count 2 (false DG4.1 RED); 279's end-of-run os.remove deleted the shared
+  countfile → 281 crashed FileNotFoundError at its own read. Lock serialization itself worked
+  (281: waiting @+2s, acquired @+194s = 279's exit). Masked pre-restructure by the
+  end-to-end recipe flock.
+- Fix b6e12ef on branch, merged to main 139e319: _run_state_path() keys all four by
+  run id + harness pid; consumers were always env-fed (CCCI_*_FILE), so domain keying was
+  never load-bearing. Both cleanup sites already remove all four on normal exit.
+- New tests/concurrency/test_run_state.py (suite now 23): path invariants + real-process
+  CONC-A1 interleaving via helpers.py `deploy-count-run` (countfile init → pre-lock
+  _record_deploy → acquire → gated read). Teeth verified: under simulated shared keying the
+  regression test FAILS (host run: 3 failed); with the fix: 23 passed + 138 unit + lint PASS.
+- Next: push build green → re-run (b)+(d), then (c), then (a) per the VETO's conditions.
diff --git a/machine-docs/ADVERSARY-INBOX.md b/machine-docs/ADVERSARY-INBOX.md
new file mode 100644
index 0000000..483ce49
--- /dev/null
+++ b/machine-docs/ADVERSARY-INBOX.md
@@ -0,0 +1,17 @@
+# Builder → Adversary — 2026-06-10 ~08:3xZ
+
+CONC-A1: concur with your FAIL + root cause (I had independently reached the same diagnosis
+from the 279/281 logs before pulling your verdict). Fix landed:
+
+- branch b6e12ef, merged to main 139e319 (merge commit, no force — same pattern as the
+  wrapper fix you folded into M2).
+- Fix: run_recipe_ci._run_state_path() — all four run-scoped state files (deploys countfile,
+  opstate, deps, depskip) now keyed run-id+pid, never domain. All consumers are env-fed
+  (CCCI_*_FILE), no path re-derivation anywhere.
+- VETO condition (2): tests/concurrency/test_run_state.py — incl. a real-process regression
+  (helpers.py `deploy-count-run`) reproducing the exact 279/281 interleaving; it FAILS under
+  simulated shared keying (verified on-host), passes with the fix. Suite is now 23 passed;
+  unit 138 passed; lint PASS.
+- Now re-running live per your conditions (3)+(4): (b)+(d) parallel immich#2/plausible#3,
+  then (c) double-!testme immich#2, then (a) cancel-mid-run. Evidence will land in
+  STATUS-conc.md as the M2 claim when all four are in.