fix(m4-1b-ii): complete §1.1 retirement in MCP content filters + review-round-1 witnesses

GLM round-1 findings on PR #1465:
- BLOCKING 1: remove role-keyed content widening from mcp.service.ts —
  isGlobalAdminActor/isTenantAdminActor/matchesTenant and every
  short-circuit keyed on users.role are gone; project/mission/task
  visibility is ownership + derived membership only, task create scope
  is unconditional. Spec test rewritten to witness that admin-role and
  platform-admin-role actors see only owned content.
- MINOR 2: writer-coverage header updated to the non-empty allowlist.
- MINOR 3: §6.9 witness — a directory-listed company still refuses
  non-granted callers (granted-read exclusion + mutation oracle).
- MINOR 4: §6.4 commit legs for renameCompany (previousName in the
  audited event) and direct revokeGrant (row deletion + grant_revoke).

apps/gateway/src/hierarchy/hierarchy-commands.integration.test.ts

@@ -210,6 +210,67 @@ describe('hierarchy commands integration', (): void => {
 
   // ── §6.4 rollback legs (one per mutation class) ────────────────────────────
 
+  it('renameCompany commits the rename with an audited event carrying previousName', async () => {
+    const created = expectOk(
+      await repo.createCompany({ actorId: OWNER, name: 'Old Name Co', slug: slug('rename') }),
+    );
+    const key = `key-${randomUUID()}`;
+    const renamed = expectOk(
+      await repo.renameCompany({
+        actorId: OWNER,
+        companyId: created.company.id,
+        name: 'New Name Co',
+        idempotencyKey: key,
+      }),
+    );
+    expect(renamed.company.name).toBe('New Name Co');
+
+    const events = await eventsForKey(key);
+    expect(events).toHaveLength(1);
+    expect(events[0]).toMatchObject({ verb: 'rename', targetId: created.company.id });
+    // §6.4: the audited rename carries the old and new names.
+    expect(events[0]!.targetSnapshot).toMatchObject({
+      name: 'New Name Co',
+      previousName: 'Old Name Co',
+    });
+    expect(await outboxForKey(key)).toHaveLength(1);
+
+    const rows = await handle.db
+      .select()
+      .from(companies)
+      .where(eq(companies.id, created.company.id));
+    expect(rows[0]!.name).toBe('New Name Co');
+  });
+
+  it('revokeGrant commits the row deletion with one audited grant_revoke event', async () => {
+    const grant = expectOk(
+      await repo.createGrant({
+        actorId: OWNER,
+        userId: SUBJECT,
+        targetKind: 'company',
+        targetId: companyId,
+        role: 'viewer',
+      }),
+    );
+    const key = `key-${randomUUID()}`;
+    const revoked = expectOk(
+      await repo.revokeGrant({ actorId: OWNER, grantId: grant.grant.id, idempotencyKey: key }),
+    );
+    expect(revoked.revokedId).toBe(grant.grant.id);
+
+    const events = await eventsForKey(key);
+    expect(events).toHaveLength(1);
+    expect(events[0]).toMatchObject({ verb: 'grant_revoke', targetId: grant.grant.id });
+    expect(await outboxForKey(key)).toHaveLength(1);
+
+    // §6 revocation = row deletion: the grant row is gone.
+    const rows = await handle.db
+      .select()
+      .from(hierarchyGrants)
+      .where(eq(hierarchyGrants.id, grant.grant.id));
+    expect(rows).toHaveLength(0);
+  });
+
   it('rolls back a create: no estate row survives the aborted transaction', async () => {
     const estateSlug = slug('rb-create');
     const key = `key-${randomUUID()}`;
@@ -517,6 +578,44 @@ describe('hierarchy commands integration', (): void => {
     });
   });
 
+  it('directory disclosure confers no authority: a listed company still refuses non-granted callers (§6.9)', async () => {
+    const listed = expectOk(
+      await repo.createCompany({ actorId: OWNER, name: 'Exposed Co', slug: slug('exposed') }),
+    );
+    expectOk(
+      await repo.changeCompanyVisibility({
+        actorId: ADMIN,
+        companyId: listed.company.id,
+        visibility: 'directory',
+      }),
+    );
+
+    // The company is directory-listed for the whole probe window...
+    expect((await repo.listDirectory()).map((entry) => entry.id)).toContain(listed.company.id);
+
+    // ...but the non-granted reader's granted-read surface still excludes it:
+    // directory disclosure adds existence/name/slug only, never content access.
+    expect(await repo.listGrantedCompanies(STRANGER)).toEqual([]);
+
+    // A stranger mutation of the listed company is refused exactly like a
+    // missing node — the §6.7 carve-out covers the listing, not commands.
+    const realProbe = await repo.renameCompany({
+      actorId: STRANGER,
+      companyId: listed.company.id,
+      name: 'x',
+    });
+    const missingProbe = await repo.renameCompany({
+      actorId: STRANGER,
+      companyId: randomUUID(),
+      name: 'x',
+    });
+    expect(realProbe).toEqual(missingProbe);
+    expect(await repo.deleteCompany({ actorId: STRANGER, companyId: listed.company.id })).toEqual({
+      ok: false,
+      error: 'not_found',
+    });
+  });
+
   it('granted companies are the reader control: owner sees them, a stranger sees nothing (§2.8)', async () => {
     const ownerCompanies = await repo.listGrantedCompanies(OWNER);
     expect(ownerCompanies.map((c) => c.id)).toContain(companyId);

apps/gateway/src/mcp/mcp.service.spec.ts

@@ -322,14 +322,20 @@ describe('MCP actor identity and tool scope enforcement', () => {
     ]);
   });
 
-  it('enforces tenant boundaries for tenant-admin brain project, mission, and task reads', async () => {
-    const { service } = makeService({
+  it('gives admin-role and platform-admin-role actors only owned content on brain reads (§1.1 retirement)', async () => {
+    // Contract 2 §1.1: users.role confers no content visibility. An actor whose
+    // role is 'admin', 'platform-admin', or 'super-admin' but who holds no
+    // ownership sees exactly what an unprivileged member with the same
+    // ownership would see — here, only the one project they own, and nothing
+    // tenant-wide or platform-wide.
+    const fixtures = {
       projects: [
+        { id: 'project-owned', ownerId: 'role-bearing-user', teamId: 'tenant-a', name: 'owned' },
         {
           id: 'project-tenant-a',
           ownerId: 'other-user-a',
           teamId: 'tenant-a',
-          name: 'same tenant',
+          name: 'same tenant, unowned',
         },
         {
           id: 'project-tenant-b',
@@ -339,33 +345,42 @@ describe('MCP actor identity and tool scope enforcement', () => {
         },
       ],
       missions: [
+        { id: 'mission-owned', projectId: 'project-owned' },
         { id: 'mission-tenant-a', tenantId: 'tenant-a', projectId: 'project-tenant-a' },
         { id: 'mission-tenant-b', tenantId: 'tenant-b', projectId: 'project-tenant-b' },
       ],
       tasks: [
+        { id: 'task-owned', projectId: 'project-owned', status: 'not-started' },
         { id: 'task-tenant-a', projectId: 'project-tenant-a', status: 'not-started' },
         { id: 'task-tenant-b', projectId: 'project-tenant-b', status: 'not-started' },
       ],
-    });
-    const { server, tools } = makeCapturingServer();
-    const actor = makeAdminActor('tenant-admin-user', 'tenant-a');
+    };
 
+    const actors = [
+      makeAdminActor('role-bearing-user', 'tenant-a'),
+      makePlatformAdminActor('role-bearing-user'),
+    ];
+
+    for (const actor of actors) {
+      const { service } = makeService(fixtures);
+      const { server, tools } = makeCapturingServer();
       service.registerTools(server, actor);
 
       const projects = JSON.parse(
         (await getTool(tools, 'brain_list_projects').handler({})).content[0]!.text,
       );
-    expect(projects.map((project: { id: string }) => project.id)).toEqual(['project-tenant-a']);
+      expect(projects.map((project: { id: string }) => project.id)).toEqual(['project-owned']);
 
       const missions = JSON.parse(
         (await getTool(tools, 'brain_list_missions').handler({})).content[0]!.text,
       );
-    expect(missions.map((mission: { id: string }) => mission.id)).toEqual(['mission-tenant-a']);
+      expect(missions.map((mission: { id: string }) => mission.id)).toEqual(['mission-owned']);
 
       const tasks = JSON.parse(
         (await getTool(tools, 'brain_list_tasks').handler({})).content[0]!.text,
       );
-    expect(tasks.map((task: { id: string }) => task.id)).toEqual(['task-tenant-a']);
+      expect(tasks.map((task: { id: string }) => task.id)).toEqual(['task-owned']);
+    }
   });
 
   it('denies tenant-admin task writes outside the authenticated tenant', async () => {

apps/gateway/src/mcp/mcp.service.ts

@@ -156,41 +156,22 @@ type TaskLike = TenantScopedLike & {
   userId?: string | null;
 };
 
-function isGlobalAdminActor(actor: McpActorContext): boolean {
-  return actor.role === 'platform-admin' || actor.role === 'super-admin';
-}
-
-function isTenantAdminActor(actor: McpActorContext): boolean {
-  return actor.role === 'admin';
-}
-
-function matchesTenant(actor: McpActorContext, record: TenantScopedLike): boolean {
-  return (
-    record.tenantId === actor.tenantId ||
-    record.organizationId === actor.tenantId ||
-    record.teamId === actor.tenantId
-  );
-}
-
+/**
+ * Contract 2 §1.1: `users.role` confers NO content visibility — the former
+ * global-admin/tenant-admin filter short-circuits keyed on the platform role
+ * are retired along with the role-derived scope sets. Content reaches an MCP
+ * actor through ownership only; widened access arrives as explicit hierarchy
+ * grants when the MCP grant mapping lands.
+ */
 function filterProjectsForActor<T extends ProjectLike>(actor: McpActorContext, projects: T[]): T[] {
-  if (isGlobalAdminActor(actor)) return projects;
-  return projects.filter(
-    (project) =>
-      project.ownerId === actor.userId ||
-      (isTenantAdminActor(actor) && matchesTenant(actor, project)),
-  );
+  return projects.filter((project) => project.ownerId === actor.userId);
 }
 
 function filterMissionsByDirectActorScope<T extends MissionLike>(
   actor: McpActorContext,
   missions: T[],
 ): T[] {
-  if (isGlobalAdminActor(actor)) return missions;
-  return missions.filter(
-    (mission) =>
-      mission.userId === actor.userId ||
-      (isTenantAdminActor(actor) && matchesTenant(actor, mission)),
-  );
+  return missions.filter((mission) => mission.userId === actor.userId);
 }
 
 function scopesEqual(left: ReadonlySet<McpToolScope>, right: ReadonlySet<McpToolScope>): boolean {
@@ -281,7 +262,6 @@ export class McpService implements OnModuleDestroy {
   }
 
   private async isProjectAuthorized(actor: McpActorContext, projectId: string): Promise<boolean> {
-    if (isGlobalAdminActor(actor)) return true;
     const project = (await this.brain.projects.findById(projectId)) as ProjectLike | undefined;
     return project ? filterProjectsForActor(actor, [project]).length === 1 : false;
   }
@@ -290,8 +270,6 @@ export class McpService implements OnModuleDestroy {
     actor: McpActorContext,
     missions: T[],
   ): Promise<T[]> {
-    if (isGlobalAdminActor(actor)) return missions;
-
     const projects = (await this.brain.projects.findAll()) as ProjectLike[];
     const projectIds = new Set(
       filterProjectsForActor(actor, projects).map((project) => project.id),
@@ -305,7 +283,6 @@ export class McpService implements OnModuleDestroy {
   }
 
   private async isMissionAuthorized(actor: McpActorContext, missionId: string): Promise<boolean> {
-    if (isGlobalAdminActor(actor)) return true;
     const mission = (await this.brain.missions.findById(missionId)) as MissionLike | undefined;
     if (!mission) return false;
     return (await this.filterMissionsForActor(actor, [mission])).length === 1;
@@ -327,7 +304,7 @@ export class McpService implements OnModuleDestroy {
     actor: McpActorContext,
     refs: { projectId?: string | null; missionId?: string | null },
   ): Promise<void> {
-    if (!isGlobalAdminActor(actor) && !refs.projectId && !refs.missionId) {
+    if (!refs.projectId && !refs.missionId) {
       throw new Error('MCP task scope denied');
     }
     await this.assertTaskReferencesAuthorized(actor, refs);
@@ -337,8 +314,6 @@ export class McpService implements OnModuleDestroy {
     actor: McpActorContext,
     tasks: T[],
   ): Promise<T[]> {
-    if (isGlobalAdminActor(actor)) return tasks;
-
     const [projects, missions] = await Promise.all([
       this.brain.projects.findAll(),
       this.brain.missions.findAll(),
@@ -355,7 +330,6 @@ export class McpService implements OnModuleDestroy {
     return tasks.filter(
       (task) =>
         task.userId === actor.userId ||
-        (isTenantAdminActor(actor) && matchesTenant(actor, task)) ||
         (typeof task.projectId === 'string' && projectIds.has(task.projectId)) ||
         (typeof task.missionId === 'string' && missionIds.has(task.missionId)),
     );

packages/db/src/hierarchy-writer-coverage.test.ts

@@ -135,9 +135,9 @@
  *     production code is anomalous and review-visible; that blind spot is
  *     accepted as a residual, not closed.
  *
- * The writer allowlist names hierarchy command/repository modules ONLY. It is
- * empty today: the hierarchy command family (M4-1b-ii) has not landed, so no
- * production module may write the class tables. The infrastructure register
+ * The writer allowlist names hierarchy command/repository modules ONLY. Its
+ * single entry is the M4-1b-ii hierarchy command repository — the sole
+ * production module permitted to write the class tables. The infrastructure register
  * holds legitimate non-hierarchy raw execution; registered modules are exempt
  * from prong (iii) only — prongs (i) and (ii) apply to them with no
  * exemption, and no registered module may appear on the writer allowlist.