diff --git a/‎.changeset/18336-retire-walled-legacy-platform-admin-anchor.md‎
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diff --git a/‎packages/core/src/security/admin-standing-surface.ts‎
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diff --git a/‎packages/core/src/security/index.ts‎
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diff --git a/‎packages/core/src/security/platform-admin.test.ts‎
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diff --git a/‎packages/core/src/security/platform-admin.ts‎
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@@ -0,0 +1,24 @@
+---
+"@objectstack/core": minor
+"@objectstack/plugin-security": minor
+"@objectstack/plugin-auth": minor
+"@objectstack/runtime": minor
+"@objectstack/plugin-hono-server": minor
+"@objectstack/organizations": minor
+---
+
+**Breaking (shipped as `minor` under the launch-window convention).** Under a **walled** tenancy posture (`group` / `isolated`), a legacy unscoped `admin_full_access` grant row no longer confers `PLATFORM_ADMIN`; platform standing there is derived from `OS_PLATFORM_OWNER_EMAIL` and from nothing else. The migration pointer that announced this since 17.3.0 is retired with it: `reportLegacyPlatformAdminGrant` and `resetLegacyPlatformAdminGrantReport` are **removed from `@objectstack/core`'s published entry** (#18336, #11663 leg L5).
+
+⚠️ **The `single` posture is untouched, deliberately.** Its zero-config first-user promotion still mints that row and that row still confers `PLATFORM_ADMIN` — a development environment started for a moment cannot be asked to declare an administrator first. Choice 4A (#11974) rules that promotion correct, and the maintainer's 2026-09-08 ruling on #16682 is verbatim: 「retiring the walled write must not retire the `single` one」. The `single` half's disposition is #11979's. ADR-0131 D5, as amended 2026-09-17 (#18413), is the governing record.
+
+**What a walled deployment must do.** Declare each administrator's **verified** address in `OS_PLATFORM_OWNER_EMAIL` (comma-separated for several) before upgrading. A walled rig that upgrades with the variable undeclared and an unscoped grant row still in place has **zero** platform administrators; the bootstrap now says so **at error**, naming the variable, the row and its holder — L4 used to skip that line for exactly this rig, on the ground that the deprecation pointer carried the remedy instead, and both halves of that arrangement have now expired.
+
+- **17.3.0 opened the window, this closes it.** L4 (17.3.0) stopped the walled bootstrap from ever *writing* the row and started the once-per-process pointer; L5 stops the walled derivation from *reading* it. The window was time-boxed and loud by design (#11663 P5).
+- **The retirement takes the ANCHOR, not the ROW.** Nothing here writes, deletes or re-owns any grant row — a walled holder keeps the `admin_full_access` permission set they hold, and loses only platform-admin *standing*: the rung and the built-in `platform_admin` position. That row's ownership is ADR-0131 C3's, on the v18 line.
+- **No new query.** The posture gate reads the environment, never the engine, so the recorded query multiset is identical under both of its answers — measured, not asserted. Under a wall the guard's grade-1 scan is skipped outright, so that path issues one read fewer.
+- **`@objectstack/plugin-auth` moves with it, at TWO readers.** `ensureDefaultOrganization`'s step-2 legacy fallback is keyed on the same expression: under a wall it no longer answers「which user is the platform admin?」from the oldest unscoped grant, so the account it would have bound as the Default Organization's `owner` — and handed the org's seeded rows to — is no longer selected. ⛔ That reader does not merely count the population, it **confers** on it, which is why it is keyed here rather than sequenced. Its bootstrap-trigger predicate retires the matching `sys_user_permission_set`-insert arm under a wall with it (cost only; the `sys_user` arms are untouched, and on a walled rig the declared owner's verifying update is the only write that ever grows the population). And:
+- **`@objectstack/plugin-auth`'s break-glass guard moves with it.** `last-admin-guard.ts` enumerates the administrator population from the SAME anchor, and its contract is to answer the same question the derivation answers. Its grade-1 (grant-anchored) enumeration is now keyed on the identical expression, so under a wall the guard no longer counts a holder the derivation does not recognise. Consequence on a walled rig: a write that would end the last **config**-anchored administrator's standing is now REFUSED where it was permitted, and a write that removes the now-inert grant row is no longer refused as though it removed the last administrator. Under `single` the guard is unchanged. Its two zero-population refusals also gained a walled clause, because「restore the `admin_full_access` row」stopped being a remedy that ends the emptiness there.
+- **`@objectstack/organizations`' walled bootstrap moves with it.** That package wraps `ensureDefaultOrganization` and is the runtime that actually performs the default-organization bootstrap on a walled deployment (plugin-auth's own wiring skips it there). With the helper's legacy fallback keyed off, a walled rig carrying a legacy grant row **no longer** has a Default Organization created for that holder, and that holder is no longer bound as its `owner`; the bootstrap waits for a declared administrator to verify instead. ⚠️ Named because the behaviour an operator gets **from this package** moves — its own source does not change, and the pin re-authored inside it is not the reason.
+- **Why `@objectstack/runtime` and `@objectstack/plugin-hono-server` are named.** Neither package's own source changes. Both carry `export * from '@objectstack/core'` (`runtime/src/index.ts`, `plugin-hono-server/src/adapter.ts`) and their built `.d.ts` carry that statement, so the two removed names leave their published surfaces too. All publishable packages sit in one Changesets `fixed` group, so naming them moves no version — it is named so the tombstone reaches the CHANGELOG an upgrading consumer of THOSE packages greps. Precedent is mixed (a core-only declaration exists); this follows the `ApiRegistry` precedent, which named every package the removal reached.
+
+<!-- adr-0087: not-required (no-migration-prescription) Nothing here is a metadata surface: the two removed symbols are plain runtime functions in `packages/core/src/security/platform-admin.ts` with no Zod schema, no `packages/spec` declaration and no stored representation, and the behaviour change is an authorization derivation keyed on an environment variable. `objectstack migrate meta` therefore has nothing to rewrite — the channels that reach an affected consumer are the compiler (for the removed exports) and the boot-time fail-closed log line (for the walled standing). No grant row is written, deleted or re-owned by this change; that rows own migration is ADR-0131 D10/C3 and stays on the v18 line. The plugin-auth guard change and the two re-export packages add no metadata surface either. -->
@@ -99,9 +99,10 @@ export interface AdminStandingTable {
  * authenticates a principal and seeds `permissions` with the key's scopes, and
  * confers no administrator standing of its own — `hasPlatformAdminGrant` is set
  * from a `sys_permission_set` row reached through an UNSCOPED
- * `sys_user_permission_set` grant (§6b) or from the deployment config matched
- * against the caller's own STORED `sys_user` row (§6b-config), never from a
- * scope string and never from the caller-seedable `grants.email`.
+ * `sys_user_permission_set` grant (§6b, on a NON-WALLED posture only since
+ * #11663 L5) or from the deployment config matched against the caller's own
+ * STORED `sys_user` row (§6b-config, on every posture), never from a scope
+ * string and never from the caller-seedable `grants.email`.
  */
 export const ADMIN_STANDING_SURFACE: Readonly<Record<string, AdminStandingTable>> = {
   sys_permission_set: {
@@ -130,9 +131,14 @@ export const ADMIN_STANDING_SURFACE: Readonly<Record<string, AdminStandingTable>
   sys_user_permission_set: {
     role: 'derives',
     reason:
-      'The grant that makes a user a platform admin: an UNSCOPED, in-window (ADR-0091) grant of '
-      + '`admin_full_access` (§6). Re-pointing it, scoping it to an organization or moving it out '
-      + 'of its window revokes the standing while leaving the row in place.',
+      'The grant that makes a user a platform admin UNDER A NON-WALLED POSTURE: an UNSCOPED, '
+      + 'in-window (ADR-0091) grant of `admin_full_access` (§6b). Re-pointing it, scoping it to an '
+      + 'organization or moving it out of its window revokes the standing while leaving the row in '
+      + 'place. ⚠️ Under a WALLED posture (`group`/`isolated`) it confers NOTHING: the walled half '
+      + 'of this legacy anchor is retired, so standing there comes from `OS_PLATFORM_OWNER_EMAIL` '
+      + '(§6b-config) and from nothing else, and this row is read only for the permission set it '
+      + 'names. Under `single` — the default — the row is unchanged and still the anchor that '
+      + "rig's zero-config first-user promotion mints.",
     columns: [
       'user_id',
       'permission_set_id',
 
@@ -213,6 +213,10 @@ export {
 // (plugin-auth's break-glass guard, plugin-security's bootstrap, the audit
 // surface) ask the SAME question instead of re-implementing the parse — which
 // is the whole reason the config read has exactly one home.
+//
+// [#11663 L5] ⛔ `reportLegacyPlatformAdminGrant` and
+// `resetLegacyPlatformAdminGrantReport` are NO LONGER exported — they are gone.
+// They carried L4's time-boxed migration notice, and L5 is that window's exit.
 export {
   PLATFORM_ADMIN_EMAIL_SEPARATOR,
   normalizePlatformAdminEmail,
@@ -221,8 +225,6 @@ export {
   resetPlatformAdminEmailMemo,
   matchesConfiguredPlatformAdmin,
   isConfiguredPlatformAdminEmail,
-  reportLegacyPlatformAdminGrant,
-  resetLegacyPlatformAdminGrantReport,
   setPlatformAdminConfigSink,
   type PlatformAdminEmailConfig,
   type PlatformAdminConfigSink,
 
@@ -11,15 +11,13 @@
  * row it has no business looking at.
  */
 
-import { describe, it, expect, beforeEach, afterEach, vi } from 'vitest';
+import { describe, it, expect, beforeEach, afterEach } from 'vitest';
 
 import {
   isConfiguredPlatformAdminEmail,
   matchesConfiguredPlatformAdmin,
   normalizePlatformAdminEmail,
   parsePlatformAdminEmails,
-  reportLegacyPlatformAdminGrant,
-  resetLegacyPlatformAdminGrantReport,
   resetPlatformAdminEmailMemo,
   resolvePlatformAdminEmails,
   setPlatformAdminConfigSink,
@@ -41,7 +39,6 @@ beforeEach(() => {
   ambient = process.env[ENV];
   delete process.env[ENV];
   resetPlatformAdminEmailMemo();
-  resetLegacyPlatformAdminGrantReport();
   sink = makeSink();
   setPlatformAdminConfigSink(sink);
 });
@@ -50,7 +47,6 @@ afterEach(() => {
   if (ambient === undefined) delete process.env[ENV];
   else process.env[ENV] = ambient;
   resetPlatformAdminEmailMemo();
-  resetLegacyPlatformAdminGrantReport();
   setPlatformAdminConfigSink(undefined);
 });
 
@@ -244,55 +240,49 @@ describe('matchesConfiguredPlatformAdmin — verified match only, fail closed',
   });
 });
 
-describe('[#11663 P5] reportLegacyPlatformAdminGrant', () => {
-  it('names the holder, the variable and the line to add — once per process', () => {
-    reportLegacyPlatformAdminGrant({ userId: 'usr_1', email: 'Ada@Example.com' });
-    reportLegacyPlatformAdminGrant({ userId: 'usr_2', email: 'bob@example.com' });
-    expect(sink.warns).toHaveLength(1);
-    expect(sink.warns[0]).toContain('usr_1');
-    expect(sink.warns[0]).toContain(`${ENV}=ada@example.com`);
-    expect(sink.warns[0]).toContain('admin_full_access');
-  });
-
-  it('falls back to a placeholder when the row was never loaded', () => {
-    // The notice must never force a `sys_user` read of its own — see the
-    // §6b-config branch, which passes the memoized row only if it is already
-    // there. A fully-seeded API-key principal has no row loaded.
-    reportLegacyPlatformAdminGrant({ userId: 'usr_1' });
-    expect(sink.warns[0]).toContain(`${ENV}=<the administrator's verified email address>`);
+/**
+ * [#11663 L5] The migration pointer is RETIRED — an ABSENCE pin, because absence
+ * is the only thing left to assert about it.
+ *
+ * L4 opened a time-boxed, loud migration window and this module carried its
+ * pointer: `reportLegacyPlatformAdminGrant`, latched once per process, plus
+ * `resetLegacyPlatformAdminGrantReport` to drop the latch for tests. L5 closed
+ * the window — under a walled posture the row the pointer pointed away from is
+ * no longer an anchor at all (`resolve-authz-context.ts` §6b), and under
+ * `single` the pointer never fired (it was posture-keyed by #13667). Both
+ * symbols are gone, from this module AND from `@objectstack/core`'s published
+ * entry.
+ *
+ * ⛔ This pin is not decoration. The suites that USED to cover these symbols all
+ * asserted a message or a latch count; deleting them leaves nothing that notices
+ * a well-meaning later edit re-adding a "helpful" deprecation warn to the
+ * authorization path — which is a per-request cost on every walled rig and a
+ * second, silent dual-track of the very kind the window existed to close. If a
+ * future leg genuinely needs a pointer again, ⛔ do not re-add it here: the
+ * operator-facing line belongs at BOOT, in
+ * `plugin-security/src/bootstrap-platform-admin.ts`, where an operator can act
+ * on it. Re-authoring this pin is then a deliberate act, which is the point.
+ */
+describe('[#11663 L5] the legacy-grant deprecation pointer is retired', () => {
+  it('⛔ neither symbol is exported by this module any more', async () => {
+    const mod: Record<string, unknown> = await import('./platform-admin.js');
+    expect('reportLegacyPlatformAdminGrant' in mod).toBe(false);
+    expect('resetLegacyPlatformAdminGrantReport' in mod).toBe(false);
+    // Positive control — the same probe on the same module object finds the
+    // symbols this leg KEEPS, so an absence read here is an absence and not a
+    // module that failed to load.
+    expect('matchesConfiguredPlatformAdmin' in mod).toBe(true);
+    expect('resolvePlatformAdminEmails' in mod).toBe(true);
   });
 
-  it('⭐ [#11975] the latch is PER PROCESS, never persistent — a fresh instance re-announces', async () => {
-    // The migration window's loudness discipline (#11975), in the half nothing
-    // else pins. Every sibling pin asserts SUPPRESSION — this file's
-    // "once per process" above, and plugin-security's boot-side
-    // `bootstrap-platform-admin-walled-owner.test.ts` "EXACTLY ONE line ... even
-    // across repeated bootstraps" — so all of them stay GREEN if the latch is
-    // ever hardened past the process: moved onto `globalThis`, stored in a
-    // module the host keeps alive, or persisted to a row or file to quiet the
-    // noise. Any of those turns "once per process" into "once EVER", and a
-    // deployment restarted onto the old anchor is then never told again, which
-    // is the silent dual-track the window exists to prevent.
-    //
-    // A fresh module registry is the closest in-process stand-in for a boot: it
-    // re-instantiates the module scope the latch lives in exactly as a new
-    // process would. ⛔ Do not "fix" a red here by resetting the latch in the
-    // loop — the point is that nothing had to.
-    const linesPerBoot: number[] = [];
-    for (let boot = 0; boot < 3; boot++) {
-      vi.resetModules();
-      const fresh = await import('./platform-admin.js');
-      const bootSink = makeSink();
-      fresh.setPlatformAdminConfigSink(bootSink);
-      // Twice, so a per-call regression is caught by the same assertion.
-      fresh.reportLegacyPlatformAdminGrant({ userId: 'usr_1', email: 'ada@example.com' });
-      fresh.reportLegacyPlatformAdminGrant({ userId: 'usr_1', email: 'ada@example.com' });
-      fresh.setPlatformAdminConfigSink(undefined);
-      linesPerBoot.push(bootSink.warns.length);
-    }
-    // Exactly one per boot: not 0 (a latch that outlived the process) and not 2
-    // (a pointer that became per-call).
-    expect(linesPerBoot).toEqual([1, 1, 1]);
+  it("⛔ nor by `@objectstack/core`'s security entry — the published surface lost them", async () => {
+    const entry: Record<string, unknown> = await import('./index.js');
+    expect('reportLegacyPlatformAdminGrant' in entry).toBe(false);
+    expect('resetLegacyPlatformAdminGrantReport' in entry).toBe(false);
+    // Positive control on the same entry: its sibling config exports are still
+    // re-exported, so the two absences above are about these two names.
+    expect('matchesConfiguredPlatformAdmin' in entry).toBe(true);
+    expect('setPlatformAdminConfigSink' in entry).toBe(true);
   });
 });
 
 
@@ -331,43 +331,21 @@ export function isConfiguredPlatformAdminEmail(
 }
 
 /**
- * [#11663 P5] The migration pointer for the LEGACY anchor.
+ * [#11663 L5] ⛔ The migration pointer for the LEGACY anchor is GONE, and with it
+ * `reportLegacyPlatformAdminGrant` / `resetLegacyPlatformAdminGrantReport`.
  *
- * Nothing is revoked in this leg: an unscoped, in-window `admin_full_access`
- * grant still confers `PLATFORM_ADMIN` exactly as it did (design §5 step 3 —
- * config-derived standing is ADDED, which is what makes this safe to land ahead
- * of every deployment setting the variable). What changes is that the row is now
- * the OLD anchor, so a holder whose standing rests on it alone is told, once,
- * which config line re-anchors them before the row route is removed.
+ * L4 opened a time-boxed, loud migration window: a walled rig whose platform
+ * standing rested on the unscoped `admin_full_access` grant row alone was told,
+ * once per process, which configuration line re-anchors it. L5 is that window's
+ * EXIT — on a walled rig the row is no longer an anchor at all
+ * (`resolve-authz-context.ts` §6b), so there is nothing left to point away from.
  *
- * Once per process, naming ONE holder. Deliberately not once per holder: this
- * runs inside the authorization path, and an unbounded per-user ledger there is
- * a memory surface for something whose whole job is to say "go look at the
- * configuration". The population question (who ALL the administrators are) is
- * the audit surface's, filed as its own leg.
+ * ⛔ Do not reintroduce a request-path notice for this. The walled rig that has
+ * declared nobody is told at BOOT, by the fail-closed backstop in
+ * `plugin-security/src/bootstrap-platform-admin.ts`, where an operator can act on
+ * it — not once per process from inside the authorization path.
+ *
+ * ⚠️ The `single` posture is NOT affected: its first-user promotion and its grant
+ * row stand (Choice 4A), and that row is still that rig's anchor. Its disposition
+ * is #11979's. See ADR-0131 D5, as amended 2026-09-17 (#18413).
  */
-let legacyGrantPointerSaid = false;
-
-export function reportLegacyPlatformAdminGrant(input: {
-  userId: string;
-  email?: unknown;
-}): void {
-  if (legacyGrantPointerSaid) return;
-  legacyGrantPointerSaid = true;
-  const email = normalizePlatformAdminEmail(input.email);
-  sink.warn(
-    `[authz] user ${input.userId} holds PLATFORM_ADMIN through the legacy unscoped `
-      + `'admin_full_access' grant row, not through ${PLATFORM_OWNER_EMAIL_ENV}. The grant row is `
-      + 'the OLD anchor and is honoured for now; it is removed in a later release. Re-anchor this '
-      + `deployment by declaring its administrators in configuration: ${PLATFORM_OWNER_EMAIL_ENV}=`
-      + `${email || '<the administrator\'s verified email address>'}`
-      + ' (comma-separated for several), and make sure each account\'s email is VERIFIED — an '
-      + 'unverified account holding a configured address is not an administrator. Reported once '
-      + 'per process; further holders are not listed.',
-  );
-}
-
-/** Drop the once-per-process latch — for tests. */
-export function resetLegacyPlatformAdminGrantReport(): void {
-  legacyGrantPointerSaid = false;
-}