diff --git a/.changeset/17281-metadata-drops-dead-platform-objects-dep.md b/.changeset/17281-metadata-drops-dead-platform-objects-dep.md
new file mode 100644
index 00000000000..7f23ac13672
--- /dev/null
+++ b/.changeset/17281-metadata-drops-dead-platform-objects-dep.md
@@ -0,0 +1,39 @@
+---
+'@objectstack/metadata': patch
+---
+
+`@objectstack/metadata` no longer declares `@objectstack/platform-objects`.
+
+The dependency was the retired `adr-0030-notification-event` migration runner's,
+and that runner was its only consumer. Nothing under `packages/metadata/src`
+carries a `@objectstack/platform-objects` specifier any more, so the declaration
+described an edge the package no longer has. The two test-tooling entries that
+existed only to serve it go with it: the `@objectstack/platform-objects/system`
+alias in `vitest.config.ts` (whose comment still cited the retired migration's
+receipt cases as its reason) and the matching `paths` mapping in `tsconfig.json`.
+
+## What an installing consumer should check
+
+⚠️ This is a **published** package dropping a declared dependency, so it changes
+what an install tree contains, not just what this repo builds. If you import
+`@objectstack/platform-objects` **without declaring it**, and it resolved for you
+only because `@objectstack/metadata` hoisted it, that resolution is gone — the
+fix is one line, and it is the supported spelling either way:
+
+```
+pnpm add @objectstack/platform-objects     # or npm/yarn equivalent
+```
+
+`@objectstack/platform-objects` is published on its own and is unchanged by this;
+nothing is renamed, removed or re-exported.
+
+⛔ Nothing `@objectstack/metadata` itself ships is affected. Measured rather than
+asserted: its built `dist/` (30 files, 10 declaration files) carries **zero**
+occurrences of `platform-objects`, against a positive control in which all nine
+of its other declared dependencies appear in four to twelve dist files each. No
+runtime import and no type reference reaches it, so no consumer can arrive at it
+through anything this package publishes.
+
+Grade `patch`, measured rather than defaulted: no export moves, no accept-set
+widens, no runtime behaviour changes. Not `skip-changeset` either — `package.json`
+is shipped by `npm pack`, and a consumer's install tree is what changes.
diff --git a/.changeset/17281-platform-objects-attest-fresh-datastore.md b/.changeset/17281-platform-objects-attest-fresh-datastore.md
new file mode 100644
index 00000000000..1d7e5c46a0f
--- /dev/null
+++ b/.changeset/17281-platform-objects-attest-fresh-datastore.md
@@ -0,0 +1,30 @@
+---
+'@objectstack/platform-objects': minor
+---
+
+A datastore created from empty now attests **two** creation-attested migration ids, not
+three.
+
+`attestFreshDatastore` (`@objectstack/platform-objects/system`) writes one `sys_migration`
+row per id in `CREATION_ATTESTED_MIGRATION_IDS` (`@objectstack/spec/system`) at the moment
+a store is created from empty. That tuple lost `'adr-0030-notification-event'` when the
+ADR-0030 notification cut-over was retired, so a store born on this version is attested for
+`'adr-0104-file-references'` and `'adr-0104-value-shapes'` alone.
+
+## What an operator sees
+
+- A fresh deployment's `sys_migration` table holds **two** creation-attested rows where it
+  held three. Nothing else about them moves: both carry the same
+  `attested: 'datastore-created-empty'` marker in `details`, and both ADR-0104 gates are
+  enabled from birth exactly as before.
+- **No row is written under `'adr-0030-notification-event'` any more, and nothing reads
+  one.** A deployment that already holds such a row keeps it, untouched —
+  `NOTIFICATION_EVENT_MIGRATION_ID` (`@objectstack/spec/system`) survives as that row's
+  name so the table stays readable by an operator. The id gates nothing, and never did.
+- Nothing this package exports is renamed, removed or re-signed. `attestFreshDatastore`
+  takes the same arguments and answers the same shape; a caller passing its own
+  `migrationIds` is unaffected, because only the default moved.
+
+There is nothing to adopt and no command to run. Pre-ADR-0030 `sys_notification` rows are
+not carried by the platform on this line, so a store created from empty has nothing the
+retired id could have attested.
diff --git a/packages/metadata/package.json b/packages/metadata/package.json
index d4d066c5756..6dac4f471b1 100644
--- a/packages/metadata/package.json
+++ b/packages/metadata/package.json
@@ -83,7 +83,6 @@
     "@objectstack/core": "workspace:*",
     "@objectstack/metadata-core": "workspace:*",
     "@objectstack/metadata-fs": "workspace:*",
-    "@objectstack/platform-objects": "workspace:*",
     "@objectstack/spec": "workspace:*",
     "@objectstack/types": "workspace:*",
     "chokidar": "^5.0.0",
diff --git a/packages/metadata/src/migrations/raw-exec-operator-detail-16657.test.ts b/packages/metadata/src/migrations/raw-exec-operator-detail-16657.test.ts
index 516a22cd357..4502cb811d1 100644
--- a/packages/metadata/src/migrations/raw-exec-operator-detail-16657.test.ts
+++ b/packages/metadata/src/migrations/raw-exec-operator-detail-16657.test.ts
@@ -23,12 +23,16 @@
  * ⚠️ That channel is a RULE, not byte-identity with what these `catch` blocks
  * used to compute, and the negative pins below do not claim otherwise: each
  * throws a NON-EMPTY `new Error(…)`, the shape for which the rule and the old
- * expression agree. They differ elsewhere — at the three `err?.message ??
+ * expression agree. They differ elsewhere — at the two `err?.message ??
  * String(err)` sites `new Error('')` recorded `''` and now records `'Error'`,
  * and `{message:42}` recorded the number where it now records
  * `'[object Object]'`; at the `error instanceof Error ? … : String(error)` site
  * `{message:'x'}` recorded `'[object Object]'` and now records `'x'`.
  *
+ * ⚠️ Two, not the three this said when it was written. The third was
+ * `migrateSysNotificationToEvent`, and it went with that runner when the
+ * adr-0030-notification-event migration was retired.
+ *
  * ⚠️ The composed sentence is the producer's, copied; `driver-sql`'s
  * `sql-driver-16657-operator-facing-cause-text.test.ts` pins the copy against a
  * real `SqlDriver.execute()` refusal.
diff --git a/packages/metadata/tsconfig.json b/packages/metadata/tsconfig.json
index c67040664d6..21bcec5409d 100644
--- a/packages/metadata/tsconfig.json
+++ b/packages/metadata/tsconfig.json
@@ -13,9 +13,6 @@
     "types": [
       "node",
       "js-yaml"
-    ],
-    "paths": {
-      "@objectstack/platform-objects/system": ["../platform-objects/src/system/index.ts"]
-    }
+    ]
   }
 }
diff --git a/packages/metadata/vitest.config.ts b/packages/metadata/vitest.config.ts
index 87b076737ab..48350fede61 100644
--- a/packages/metadata/vitest.config.ts
+++ b/packages/metadata/vitest.config.ts
@@ -43,18 +43,6 @@ export default defineConfig({
         replacement: path.join(path.resolve(__dirname, '..'), 'spec/src/$1/index.ts'),
       },
       { find: /^@objectstack\/spec$/, replacement: path.resolve(__dirname, '../spec/src/index.ts') },
-      // [#16100] The deployment-ledger writer/reader pair the notification-event
-      // migration's receipt cases drive (`attestFreshDatastore` seeds the
-      // fresh-store row, `isDataMigrationVerified` reads the verdict back). The
-      // entry is ANCHORED on the subpath rather than spelled bare: this package
-      // publishes a FILE-shaped subpath (`./plugin`), so a bare prefix rule with
-      // a file replacement would resolve `…/system` to
-      // `…/platform-objects/src/index.ts/system` — ENOTDIR at run time, from a
-      // config that reads as correct.
-      {
-        find: /^@objectstack\/platform-objects\/system$/,
-        replacement: path.resolve(__dirname, '../platform-objects/src/system/index.ts'),
-      },
       // Subpath BEFORE the bare package, same prefix-match reason: `./node` is a
       // published subpath served by a FILE (`types/src/node.ts` — the node-only slice
       // the root export deliberately excludes), so the bare entry would resolve it to
diff --git a/packages/plugins/plugin-audit/src/read-audit-view-instant-preservation.integration.test.ts b/packages/plugins/plugin-audit/src/read-audit-view-instant-preservation.integration.test.ts
index c6336be0389..a9853933635 100644
--- a/packages/plugins/plugin-audit/src/read-audit-view-instant-preservation.integration.test.ts
+++ b/packages/plugins/plugin-audit/src/read-audit-view-instant-preservation.integration.test.ts
@@ -15,9 +15,11 @@
  * the driver stores, on BOTH sides of any change to the write's context. The
  * case is green today, was green before #15964 flattened the ordinary insert
  * branch, and stays green after this card's fix. An instrument that cannot fail
- * is indistinguishable from a pass — the same shape that let
+ * is indistinguishable from a pass — the same shape that let the since-retired
  * `migrate-sys-notification-to-event.test.ts` read `23 passed` for #16312 while
- * the rows it described were being restamped.
+ * the rows it described were being restamped. That file went with the
+ * adr-0030-notification-event migration it covered; it is named here for the
+ * SHAPE it demonstrated, not as a file to go read.
  *
  * ⇒ this file is the instrument that CAN fail. It boots a real
  * {@link ObjectKernel} with the real {@link ObjectQLPlugin} (so the shipped
@@ -25,8 +27,9 @@
  * reads the persisted row back through the driver's own SQL surface.
  *
  * ⚠️ Unlike #16312's equivalent (`packages/runtime/src/notification-migration-
- * audit-preservation.integration.test.ts`), this one lives beside the code it
- * tests. That file had to leave `packages/metadata` because
+ * audit-preservation.integration.test.ts`, retired together with the migration
+ * it covered and no longer in the tree), this one lives beside the code it
+ * tests. That file had had to leave `packages/metadata` because
  * `@objectstack/objectql` depends on it and the test-only import would have
  * closed a cycle. Here the edge already runs the other way —
  * `@objectstack/plugin-audit` depends on `@objectstack/objectql` — and
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 981a61066d0..d02030ab565 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -1206,9 +1206,6 @@ importers:
       '@objectstack/metadata-fs':
         specifier: workspace:*
         version: link:../metadata-fs
-      '@objectstack/platform-objects':
-        specifier: workspace:*
-        version: link:../platform-objects
       '@objectstack/spec':
         specifier: workspace:*
         version: link:../spec