diff --git a/ci/core-ref.json b/ci/core-ref.json
index a05c792..0a105f0 100644
--- a/ci/core-ref.json
+++ b/ci/core-ref.json
@@ -1,14 +1,16 @@
 {
   "repo": "https://gitea.whitlocktech.com/RunicGateway/website.git",
   "branch": "main",
-  "ref": "66bb3b9a3fad01112c06f32d931c9bae56d22de6",
+  "ref": "655fbf3f69a6a1fd650ecbc81afd6cf9c2ad9f66",
   "why": [
     "The core this kit is written against, pinned to a commit rather than a branch.",
-    "This one is the engagement cutover, the commit MODULE_API_VERSION 1.9.0 reached",
-    "`main` on, and 1.9.0 is what template/module.json declares. It moved here from",
-    "1.6.0 (the Teams cutover) because engagement expanded the contract the book",
-    "teaches by three registrations and two calls: a module now declares what its",
-    "game can announce and never who is told.",
+    "This one is the EVENT SYSTEM cutover, the commit MODULE_API_VERSION 1.10.0",
+    "reached `main` on (website#199), and 1.10.0 is what template/module.json",
+    "declares. It moved here from 66bb3b9a (1.9.0, the engagement cutover) because",
+    "the event contract expanded the book by a whole chapter: a module now declares",
+    "what its game can DO on request -- event actions, budget dimensions, leases and",
+    "option sources -- where every earlier chapter taught only a read path and a",
+    "thing to announce.",
     "",
     "Moving this pin is the moment someone re-reads the chapters: CI asserts the",
     "version template/module.json declares still equals this core's",
@@ -19,29 +21,40 @@
     "own. Nothing goes red until someone moves the pin. Between cutovers the kit is",
     "not wrong, it is DATED - and this file is where the date is written down.",
     "",
-    "The mechanism earned its keep again here. Writing chapter 2's engagement",
-    "section against 1.9.0 found that the seeded body a module ships is the one",
-    "thing registerEngagementSeeds does not validate - it checks that `blocks` is a",
-    "non-empty array and stops - so the template's own example body had a heading",
-    "level of 2 where the block registry takes 'h2', and no block ids at all. It",
-    "would have registered, seeded, and failed the first time an operator opened it.",
-    "Caught by running the template's register() through core's real registry at",
-    "this ref, which is what a re-read is for; both the fix and the gap are now in",
-    "the chapter and beside the code.",
+    "This pin move is a REPAIR as well as a date. Chapter 5 landed (#10) declaring",
+    "^1.10.0 while this file still named a 1.9.0 core, so `main` has been red on",
+    "checkCoreApi since it merged -- deliberately, and stated in that PR, but the",
+    "red belongs to the window and not to the repo. This is the commit that was",
+    "always going to close it, and it could not be written until the events sha",
+    "existed on `main`. Same shape Teams phase 11 used.",
     "",
-    "That gap is also why this file's own instruction is not enough on its own. The",
+    "The mechanism earned its keep again here, and twice. Writing chapter 5 against",
+    "the event contract found that an idempotency key on a QUESTION makes every",
+    "later read permanently stale -- an at-most-once store answers a repeated key",
+    "with the ORIGINAL reply, so the template's second read of a value returned the",
+    "first read's answer for ever, and the module could not see a change it had just",
+    "made. It also found that a refusal's reason goes in `error`: core's classifier",
+    "reads no other name, so a refusal reported under `detail` reached an author as",
+    "a bare \"refused\". Neither was found by writing prose. Both were found by",
+    "running the template's real declarations through core's real registry and its",
+    "real envelopes through core's real dispatcher.",
+    "",
+    "That is also why this file's own instruction is not enough on its own. The",
     "template job builds and tests the template against fakes and checks this",
     "number; it does not load the module into core. A declaration a fake accepts",
     "and core refuses would ship green, so a pin move is a run against a real core,",
-    "not just an edit here.",
+    "not just an edit here. It was run at THIS ref: core's real registries accepted",
+    "the template's budget, option source, lease and event action, and apply()",
+    "accepted the set.",
     "",
     "The branch said `edge` until 2026-08-12, when the module system cut over and",
     "that branch was deleted (MODULE_SYSTEM.md 2.9). Two later workstreams cut an",
-    "`edge` of their own and this pin skipped both: the kit is written against what",
-    "shipped, never against what is in flight. Nothing in CI reads the branch field",
-    "- it clones the repo and checks out the sha - which is why a wrong label here",
-    "would sit unnoticed. It is for the person deciding whether a newer core is",
-    "worth re-reading the book for.",
+    "`edge` of their own and this pin skipped both; the Event System cut a third,",
+    "and this pin skipped that too until it reached `main`. The kit is written",
+    "against what shipped, never against what is in flight. Nothing in CI reads the",
+    "branch field - it clones the repo and checks out the sha - which is why a wrong",
+    "label here would sit unnoticed. It is for the person deciding whether a newer",
+    "core is worth re-reading the book for.",
     "",
     "Same convention as Module-uo's ci/core-ref.json, deliberately - one file, one",
     "sha, reviewable in a diff."