diff --git a/CHANGELOG.md b/CHANGELOG.md
index f529c68..fab8cd4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,20 @@
 
 # Changelog
 
+## v0.1.0-preview.16 — 2026-09-03
+
+- Add bounded organization-member and direct user-role listings for
+  application-owned access administration pages. Direct listings deliberately
+  exclude team and narrower resource grants rather than flattening distinct
+  authority into one apparent role.
+- Add atomic direct-role replacement with exact expected-binding checks,
+  transactional access audit, active-member validation, and final active
+  direct-owner protection. SQLite serializes competing replacements so stale
+  administration fails with a stable conflict instead of partially applying.
+- Record the Gamertan administration dogfood boundary: applications authorize
+  the route and fresh passkey assertion, while Foundations owns the reusable
+  storage transaction and invariants.
+
 ## v0.1.0-preview.15 — 2026-09-03
 
 - Permit applications to opt into an exact non-default HTTPS WebAuthn origin
diff --git a/README.md b/README.md
index 41c88c6..fe2c77d 100644
--- a/README.md
+++ b/README.md
@@ -17,7 +17,7 @@ router, handlers, HTML, authorization decisions, cache behavior, and
 deployment. Adopt one boundary at a time; Go compiles and links only the
 packages you import.
 
-> **Public preview:** `v0.1.0-preview.15`. APIs may change before a stable
+> **Public preview:** `v0.1.0-preview.16`. APIs may change before a stable
 > release. Linux is the maintained release platform.
 
 ## Why Web Foundations?
@@ -57,14 +57,14 @@ owns—and, just as importantly, what remains application policy.
 Pin the preview in an application module:
 
 ```bash
-go get gamertan.com/web@v0.1.0-preview.15
+go get gamertan.com/web@v0.1.0-preview.16
 go mod verify
 ```
 
 An application may name the first package it intends to adopt:
 
 ```bash
-go get gamertan.com/web/requestmeta@v0.1.0-preview.15
+go get gamertan.com/web/requestmeta@v0.1.0-preview.16
 ```
 
 The version belongs to the `gamertan.com/web` module. See the
diff --git a/access/access.go b/access/access.go
index 78a6988..950c2e2 100644
--- a/access/access.go
+++ b/access/access.go
@@ -18,8 +18,11 @@ import (
 )
 
 var (
-	idPattern   = regexp.MustCompile(`^[A-Za-z0-9_-]{8,128}$`)
-	namePattern = regexp.MustCompile(`^[a-z][a-z0-9._-]{1,127}$`)
+	ErrLastOwner          = errors.New("access: the last active direct owner must be preserved")
+	ErrRoleChangeConflict = errors.New("access: role binding changed")
+	ErrRoleUnchanged      = errors.New("access: role is unchanged")
+	idPattern             = regexp.MustCompile(`^[A-Za-z0-9_-]{8,128}$`)
+	namePattern           = regexp.MustCompile(`^[a-z][a-z0-9._-]{1,127}$`)
 )
 
 type SubjectKind string
@@ -116,6 +119,8 @@ type Repository interface {
 	Grant(context.Context, Binding) error
 	Revoke(context.Context, string, string, time.Time) error
 	EffectiveBindings(context.Context, string, string) ([]Binding, error)
+	OrganizationUserBindings(context.Context, string, int) ([]Binding, error)
+	ReplaceOrganizationUserRole(context.Context, []string, Binding, string, AuditEvent) error
 	CreateBreakGlass(context.Context, BreakGlass, AuditEvent) error
 	ActiveBreakGlass(context.Context, string, string, time.Time) ([]BreakGlass, error)
 	AppendAccessAudit(context.Context, AuditEvent) error
@@ -123,8 +128,9 @@ type Repository interface {
 }
 
 type Options struct {
-	Random io.Reader
-	Now    func() time.Time
+	Random    io.Reader
+	Now       func() time.Time
+	OwnerRole string
 }
 
 type Service struct {
@@ -132,6 +138,7 @@ type Service struct {
 	policy     Policy
 	random     io.Reader
 	now        func() time.Time
+	ownerRole  string
 }
 
 func New(repository Repository, policy Policy, options Options) (*Service, error) {
@@ -147,7 +154,12 @@ func New(repository Repository, policy Policy, options Options) (*Service, error
 	if options.Now == nil {
 		options.Now = time.Now
 	}
-	return &Service{repository: repository, policy: policy, random: options.Random, now: options.Now}, nil
+	if options.OwnerRole != "" {
+		if _, ok := policy.Roles[options.OwnerRole]; !ok {
+			return nil, errors.New("access: owner role is unknown")
+		}
+	}
+	return &Service{repository: repository, policy: policy, random: options.Random, now: options.Now, ownerRole: options.OwnerRole}, nil
 }
 
 func (service *Service) Seed(ctx context.Context) error {
@@ -183,6 +195,62 @@ func (service *Service) Grant(ctx context.Context, input Grant) (Binding, error)
 	return binding, nil
 }
 
+// OrganizationUserBindings lists active, direct, organization-wide user role
+// bindings. Team and narrower project/environment/service grants remain
+// separate because an administration screen must not silently flatten their
+// authority into one apparent role.
+func (service *Service) OrganizationUserBindings(ctx context.Context, organizationID string, limit int) ([]Binding, error) {
+	if !idPattern.MatchString(organizationID) || limit < 1 || limit > 2000 {
+		return nil, errors.New("access: invalid organization binding query")
+	}
+	return service.repository.OrganizationUserBindings(ctx, organizationID, limit)
+}
+
+type OrganizationUserRoleChange struct {
+	OrganizationID     string
+	UserID             string
+	Role               string
+	ActorUserID        string
+	RequestID          string
+	ExpectedBindingIDs []string
+}
+
+// ReplaceOrganizationUserRole atomically replaces every current direct,
+// organization-wide role for one active member with exactly one role. The
+// expected binding IDs make concurrent administration fail closed. When an
+// owner role is configured, the repository also protects the final active
+// direct owner in the same transaction.
+func (service *Service) ReplaceOrganizationUserRole(ctx context.Context, input OrganizationUserRoleChange) (Binding, error) {
+	if service.ownerRole == "" {
+		return Binding{}, errors.New("access: owner role is required for role replacement")
+	}
+	if !idPattern.MatchString(input.OrganizationID) || !idPattern.MatchString(input.UserID) || !idPattern.MatchString(input.ActorUserID) || !text(input.RequestID, 128, true) {
+		return Binding{}, errors.New("access: invalid organization role replacement")
+	}
+	if _, ok := service.policy.Roles[input.Role]; !ok {
+		return Binding{}, errors.New("access: unknown role")
+	}
+	expected, err := canonicalBindingIDs(input.ExpectedBindingIDs)
+	if err != nil {
+		return Binding{}, err
+	}
+	bindingID, err := randomID(service.random)
+	if err != nil {
+		return Binding{}, err
+	}
+	auditID, err := randomID(service.random)
+	if err != nil {
+		return Binding{}, err
+	}
+	now := service.now().UTC()
+	binding := Binding{ID: bindingID, SubjectKind: User, SubjectID: input.UserID, Role: input.Role, Scope: Scope{OrganizationID: input.OrganizationID}, GrantedBy: input.ActorUserID, GrantedAt: now}
+	audit := AuditEvent{ID: auditID, OrganizationID: input.OrganizationID, ActorUserID: input.ActorUserID, Action: "access.role.replace", ResourceType: "user", ResourceID: input.UserID, RequestID: input.RequestID, Summary: "Direct organization role replaced", CreatedAt: now}
+	if err = service.repository.ReplaceOrganizationUserRole(ctx, expected, binding, service.ownerRole, audit); err != nil {
+		return Binding{}, err
+	}
+	return binding, nil
+}
+
 type Decision struct {
 	Allowed bool
 	Source  string
@@ -265,6 +333,20 @@ func randomID(random io.Reader) (string, error) {
 	return base64.RawURLEncoding.EncodeToString(value), nil
 }
 
+func canonicalBindingIDs(values []string) ([]string, error) {
+	if len(values) > 16 {
+		return nil, errors.New("access: invalid expected role bindings")
+	}
+	result := append([]string(nil), values...)
+	sort.Strings(result)
+	for index, value := range result {
+		if !idPattern.MatchString(value) || index > 0 && result[index-1] == value {
+			return nil, errors.New("access: invalid expected role bindings")
+		}
+	}
+	return result, nil
+}
+
 func text(value string, limit int, emptyOK bool) bool {
 	return (emptyOK || value != "") && len(value) <= limit && !strings.ContainsAny(value, "\x00\r\n")
 }
diff --git a/access/access_test.go b/access/access_test.go
index 93b61b8..1dff362 100644
--- a/access/access_test.go
+++ b/access/access_test.go
@@ -4,6 +4,8 @@ package access
 
 import (
 	"context"
+	"errors"
+	"slices"
 	"strings"
 	"testing"
 	"time"
@@ -56,9 +58,57 @@ func TestScopeHierarchyAndLifetimeFailClosed(t *testing.T) {
 	}
 }
 
+func TestOrganizationUserRoleReplacementIsBoundedAndCanonical(t *testing.T) {
+	now := time.Unix(2000, 0).UTC()
+	policy := Policy{Roles: map[string]string{"owner": "Owner", "viewer": "Viewer"}, Permissions: map[string]string{"site.view": "View site"}, Grants: map[string][]string{"owner": {"site.view"}, "viewer": {"site.view"}}}
+	if _, err := New(&repositoryStub{}, policy, Options{OwnerRole: "missing"}); err == nil {
+		t.Fatal("unknown owner role accepted")
+	}
+	repository := &repositoryStub{}
+	service, err := New(repository, policy, Options{Random: strings.NewReader(strings.Repeat("r", 512)), Now: func() time.Time { return now }, OwnerRole: "owner"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	binding, err := service.ReplaceOrganizationUserRole(t.Context(), OrganizationUserRoleChange{
+		OrganizationID:     "org-12345678",
+		UserID:             "user-12345678",
+		Role:               "viewer",
+		ActorUserID:        "user-87654321",
+		RequestID:          "request-12345678",
+		ExpectedBindingIDs: []string{"binding-22222222", "binding-11111111"},
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if binding.Role != "viewer" || binding.SubjectKind != User || binding.Scope != (Scope{OrganizationID: "org-12345678"}) || binding.GrantedAt != now {
+		t.Fatalf("binding=%+v", binding)
+	}
+	if !slices.Equal(repository.replacedExpected, []string{"binding-11111111", "binding-22222222"}) || repository.replacedOwnerRole != "owner" {
+		t.Fatalf("expected=%v owner=%q", repository.replacedExpected, repository.replacedOwnerRole)
+	}
+	if repository.replacedAccessAudit.Action != "access.role.replace" || repository.replacedAccessAudit.ResourceID != "user-12345678" || repository.replacedAccessAudit.RequestID != "request-12345678" {
+		t.Fatalf("audit=%+v", repository.replacedAccessAudit)
+	}
+	if _, err = service.ReplaceOrganizationUserRole(t.Context(), OrganizationUserRoleChange{OrganizationID: "org-12345678", UserID: "user-12345678", Role: "viewer", ActorUserID: "user-87654321", ExpectedBindingIDs: []string{"binding-11111111", "binding-11111111"}}); err == nil {
+		t.Fatal("duplicate expected binding accepted")
+	}
+	serviceWithoutOwner, err := New(&repositoryStub{}, policy, Options{})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if _, err = serviceWithoutOwner.ReplaceOrganizationUserRole(t.Context(), OrganizationUserRoleChange{}); err == nil || errors.Is(err, ErrRoleChangeConflict) {
+		t.Fatalf("missing owner role err=%v", err)
+	}
+}
+
 type repositoryStub struct {
-	bindings   []Binding
-	breakGlass []BreakGlass
+	bindings            []Binding
+	breakGlass          []BreakGlass
+	organizationUser    []Binding
+	replacedExpected    []string
+	replacedBinding     Binding
+	replacedOwnerRole   string
+	replacedAccessAudit AuditEvent
 }
 
 func (*repositoryStub) SeedAccessPolicy(context.Context, Policy) error          { return nil }
@@ -67,6 +117,16 @@ func (*repositoryStub) Revoke(context.Context, string, string, time.Time) error
 func (repository *repositoryStub) EffectiveBindings(context.Context, string, string) ([]Binding, error) {
 	return repository.bindings, nil
 }
+func (repository *repositoryStub) OrganizationUserBindings(context.Context, string, int) ([]Binding, error) {
+	return repository.organizationUser, nil
+}
+func (repository *repositoryStub) ReplaceOrganizationUserRole(_ context.Context, expected []string, binding Binding, ownerRole string, audit AuditEvent) error {
+	repository.replacedExpected = append([]string(nil), expected...)
+	repository.replacedBinding = binding
+	repository.replacedOwnerRole = ownerRole
+	repository.replacedAccessAudit = audit
+	return nil
+}
 func (repository *repositoryStub) CreateBreakGlass(_ context.Context, grant BreakGlass, _ AuditEvent) error {
 	repository.breakGlass = []BreakGlass{grant}
 	return nil
diff --git a/authsqlite/access.go b/authsqlite/access.go
index 0bb7245..67f2dc0 100644
--- a/authsqlite/access.go
+++ b/authsqlite/access.go
@@ -6,6 +6,7 @@ import (
 	"context"
 	"database/sql"
 	"errors"
+	"slices"
 	"time"
 
 	"gamertan.com/web/access"
@@ -134,6 +135,159 @@ func (store *Store) EffectiveBindings(ctx context.Context, organizationID, userI
 	return result, rows.Err()
 }
 
+func (store *Store) OrganizationUserBindings(ctx context.Context, organizationID string, limit int) ([]access.Binding, error) {
+	if !opaqueID(organizationID) || limit < 1 || limit > 2000 {
+		return nil, errors.New("authsqlite: invalid organization binding query")
+	}
+	rows, err := store.db.QueryContext(ctx, `SELECT b.id,b.subject_id,b.role_name,b.granted_by_user_id,b.granted_at
+		FROM gwf_access_bindings b
+		JOIN gwf_organization_memberships m ON m.organization_id=b.organization_id AND m.user_id=b.subject_id
+		WHERE b.organization_id=? AND b.subject_kind='user'
+		AND b.project_id IS NULL AND b.environment_id IS NULL AND b.service_id IS NULL
+		AND b.revoked_at IS NULL
+		ORDER BY b.subject_id,b.role_name,b.id
+		LIMIT ?`, organizationID, limit)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	result := make([]access.Binding, 0)
+	for rows.Next() {
+		var binding access.Binding
+		var granted int64
+		if err = rows.Scan(&binding.ID, &binding.SubjectID, &binding.Role, &binding.GrantedBy, &granted); err != nil {
+			return nil, err
+		}
+		binding.SubjectKind = access.User
+		binding.Scope = access.Scope{OrganizationID: organizationID}
+		binding.GrantedAt = time.Unix(granted, 0).UTC()
+		result = append(result, binding)
+	}
+	return result, rows.Err()
+}
+
+func (store *Store) ReplaceOrganizationUserRole(ctx context.Context, expected []string, replacement access.Binding, ownerRole string, audit access.AuditEvent) error {
+	if !validOrganizationRoleReplacement(expected, replacement, ownerRole, audit) {
+		return errors.New("authsqlite: invalid organization role replacement")
+	}
+	tx, err := store.db.BeginTx(ctx, nil)
+	if err != nil {
+		return err
+	}
+	defer tx.Rollback()
+
+	// Acquire the SQLite write lock before reading the optimistic binding set.
+	// This serializes competing role replacements so the loser observes the
+	// committed binding IDs and returns ErrRoleChangeConflict instead of an
+	// ambiguous busy-snapshot error.
+	result, err := tx.ExecContext(ctx, `UPDATE gwf_organization_memberships SET status=status
+		WHERE organization_id=? AND user_id=? AND status='active'
+		AND EXISTS (SELECT 1 FROM gwf_organizations o WHERE o.id=? AND o.status='active')
+		AND EXISTS (SELECT 1 FROM gwf_users u WHERE u.id=? AND u.status='active')`, replacement.Scope.OrganizationID, replacement.GrantedBy, replacement.Scope.OrganizationID, replacement.GrantedBy)
+	if err != nil {
+		return err
+	}
+	if changed, _ := result.RowsAffected(); changed != 1 {
+		return errors.New("authsqlite: role grantor is not active in organization")
+	}
+
+	var active int
+	if err = tx.QueryRowContext(ctx, `SELECT COUNT(*)
+		FROM gwf_organization_memberships m
+		JOIN gwf_organizations o ON o.id=m.organization_id AND o.status='active'
+		JOIN gwf_users u ON u.id=m.user_id AND u.status='active'
+		WHERE m.organization_id=? AND m.user_id=? AND m.status='active'`, replacement.Scope.OrganizationID, replacement.SubjectID).Scan(&active); err != nil {
+		return err
+	}
+	if active != 1 {
+		return errors.New("authsqlite: access subject is not active in organization")
+	}
+
+	rows, err := tx.QueryContext(ctx, `SELECT id,role_name FROM gwf_access_bindings
+		WHERE organization_id=? AND subject_kind='user' AND subject_id=?
+		AND project_id IS NULL AND environment_id IS NULL AND service_id IS NULL
+		AND revoked_at IS NULL ORDER BY id`, replacement.Scope.OrganizationID, replacement.SubjectID)
+	if err != nil {
+		return err
+	}
+	var currentIDs []string
+	var currentRoles []string
+	for rows.Next() {
+		var id, role string
+		if err = rows.Scan(&id, &role); err != nil {
+			rows.Close()
+			return err
+		}
+		currentIDs = append(currentIDs, id)
+		currentRoles = append(currentRoles, role)
+	}
+	if err = rows.Err(); err != nil {
+		rows.Close()
+		return err
+	}
+	if err = rows.Close(); err != nil {
+		return err
+	}
+	if !slices.Equal(currentIDs, expected) {
+		return access.ErrRoleChangeConflict
+	}
+	if len(currentRoles) == 1 && currentRoles[0] == replacement.Role {
+		return access.ErrRoleUnchanged
+	}
+	if replacement.Role != ownerRole && slices.Contains(currentRoles, ownerRole) {
+		var otherOwners int
+		if err = tx.QueryRowContext(ctx, `SELECT COUNT(DISTINCT b.subject_id)
+			FROM gwf_access_bindings b
+			JOIN gwf_organization_memberships m ON m.organization_id=b.organization_id AND m.user_id=b.subject_id AND m.status='active'
+			JOIN gwf_users u ON u.id=m.user_id AND u.status='active'
+			WHERE b.organization_id=? AND b.subject_kind='user' AND b.subject_id<>? AND b.role_name=?
+			AND b.project_id IS NULL AND b.environment_id IS NULL AND b.service_id IS NULL
+			AND b.revoked_at IS NULL`, replacement.Scope.OrganizationID, replacement.SubjectID, ownerRole).Scan(&otherOwners); err != nil {
+			return err
+		}
+		if otherOwners == 0 {
+			return access.ErrLastOwner
+		}
+	}
+
+	if _, err = tx.ExecContext(ctx, `UPDATE gwf_access_bindings SET revoked_by_user_id=?,revoked_at=?
+		WHERE organization_id=? AND subject_kind='user' AND subject_id=?
+		AND project_id IS NULL AND environment_id IS NULL AND service_id IS NULL
+		AND revoked_at IS NULL`, replacement.GrantedBy, replacement.GrantedAt.Unix(), replacement.Scope.OrganizationID, replacement.SubjectID); err != nil {
+		return err
+	}
+	result, err = tx.ExecContext(ctx, `INSERT INTO gwf_access_bindings(id,organization_id,subject_kind,subject_id,role_name,project_id,environment_id,service_id,granted_by_user_id,granted_at)
+		SELECT ?,?,'user',?,?,NULL,NULL,NULL,?,? FROM gwf_access_roles WHERE name=?`, replacement.ID, replacement.Scope.OrganizationID, replacement.SubjectID, replacement.Role, replacement.GrantedBy, replacement.GrantedAt.Unix(), replacement.Role)
+	if err != nil {
+		return err
+	}
+	if changed, _ := result.RowsAffected(); changed != 1 {
+		return errors.New("authsqlite: replacement role has not been seeded")
+	}
+	if err = appendAccessAudit(ctx, tx, audit); err != nil {
+		return err
+	}
+	return tx.Commit()
+}
+
+func validOrganizationRoleReplacement(expected []string, replacement access.Binding, ownerRole string, audit access.AuditEvent) bool {
+	if !safeName(ownerRole) || !opaqueID(replacement.ID) || replacement.SubjectKind != access.User || !opaqueID(replacement.SubjectID) || !safeName(replacement.Role) || replacement.Scope.Validate() != nil || replacement.Scope.ProjectID != "" || replacement.Scope.EnvironmentID != "" || replacement.Scope.ServiceID != "" || !opaqueID(replacement.GrantedBy) || replacement.GrantedAt.IsZero() {
+		return false
+	}
+	if !validAccessAudit(audit) || audit.OrganizationID != replacement.Scope.OrganizationID || audit.ActorUserID != replacement.GrantedBy || audit.Action != "access.role.replace" || audit.ResourceType != "user" || audit.ResourceID != replacement.SubjectID || !audit.CreatedAt.Equal(replacement.GrantedAt) {
+		return false
+	}
+	if len(expected) > 16 || !slices.IsSorted(expected) {
+		return false
+	}
+	for index, id := range expected {
+		if !opaqueID(id) || index > 0 && expected[index-1] == id {
+			return false
+		}
+	}
+	return true
+}
+
 func (store *Store) CreateBreakGlass(ctx context.Context, grant access.BreakGlass, audit access.AuditEvent) error {
 	if !validBreakGlass(grant) || !validAccessAudit(audit) || audit.OrganizationID != grant.OrganizationID || audit.ActorUserID != grant.UserID {
 		return errors.New("authsqlite: invalid break-glass event")
diff --git a/authsqlite/organizations.go b/authsqlite/organizations.go
index e821b37..84e5d86 100644
--- a/authsqlite/organizations.go
+++ b/authsqlite/organizations.go
@@ -261,6 +261,34 @@ func (store *Store) MembershipsForUser(ctx context.Context, userID string) ([]or
 	return result, rows.Err()
 }
 
+func (store *Store) OrganizationMemberships(ctx context.Context, organizationID string, limit int) ([]organizations.Membership, error) {
+	if !opaqueID(organizationID) || limit < 1 || limit > 2000 {
+		return nil, errors.New("authsqlite: invalid organization member query")
+	}
+	rows, err := store.db.QueryContext(ctx, `SELECT m.user_id,m.status,m.joined_at
+		FROM gwf_organization_memberships m
+		JOIN gwf_organizations o ON o.id=m.organization_id
+		WHERE m.organization_id=?
+		ORDER BY m.joined_at,m.user_id
+		LIMIT ?`, organizationID, limit)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	result := make([]organizations.Membership, 0)
+	for rows.Next() {
+		var membership organizations.Membership
+		var joined int64
+		if err = rows.Scan(&membership.UserID, &membership.Status, &joined); err != nil {
+			return nil, err
+		}
+		membership.OrganizationID = organizationID
+		membership.JoinedAt = time.Unix(joined, 0).UTC()
+		result = append(result, membership)
+	}
+	return result, rows.Err()
+}
+
 func (store *Store) TeamsForUser(ctx context.Context, organizationID, userID string) ([]organizations.Team, error) {
 	if !opaqueID(organizationID) || !opaqueID(userID) {
 		return nil, errors.New("authsqlite: invalid team query")
diff --git a/authsqlite/store_test.go b/authsqlite/store_test.go
index bfe8e45..828ebd7 100644
--- a/authsqlite/store_test.go
+++ b/authsqlite/store_test.go
@@ -477,3 +477,169 @@ func TestInvitationAccessLifecycleAndLastOwnerProtection(t *testing.T) {
 		t.Fatalf("archived organization decision=%+v err=%v", decision, err)
 	}
 }
+
+func TestOrganizationRoleAdministrationIsAtomicAndProtectsOwners(t *testing.T) {
+	store, err := Open(filepath.Join(t.TempDir(), "accounts.db"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer store.Close()
+	now := time.Date(2026, 9, 3, 16, 0, 0, 0, time.UTC)
+	authService, err := auth.New(store, auth.Options{Now: func() time.Time { return now }})
+	if err != nil {
+		t.Fatal(err)
+	}
+	owner, err := authService.CreateUser(t.Context(), auth.CreateUser{Username: "access.owner", Email: "access-owner@example.test", DisplayName: "Access Owner", Password: "correct horse battery staple"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	member, err := authService.CreateUser(t.Context(), auth.CreateUser{Username: "access.member", Email: "access-member@example.test", DisplayName: "Access Member", Password: "correct horse battery staple"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	organizationService, err := organizations.New(store, organizations.Options{Now: func() time.Time { return now }, OwnerRole: "owner"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	organization, err := organizationService.CreateOrganization(t.Context(), organizations.CreateOrganization{Slug: "access-admin", Name: "Access Admin", OwnerUserID: owner.ID})
+	if err != nil {
+		t.Fatal(err)
+	}
+	raw, _, err := organizationService.Invite(t.Context(), organization.ID, member.Email, owner.ID, time.Hour)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err = organizationService.AcceptInvitation(t.Context(), raw, member.ID); err != nil {
+		t.Fatal(err)
+	}
+	policy := access.Policy{
+		Roles:       map[string]string{"owner": "Owner", "viewer": "Viewer"},
+		Permissions: map[string]string{"site.view": "View site"},
+		Grants:      map[string][]string{"owner": {"site.view"}, "viewer": {"site.view"}},
+	}
+	accessService, err := access.New(store, policy, access.Options{Now: func() time.Time { return now }, OwnerRole: "owner"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err = accessService.Seed(t.Context()); err != nil {
+		t.Fatal(err)
+	}
+	ownerBinding, err := accessService.Grant(t.Context(), access.Grant{SubjectKind: access.User, SubjectID: owner.ID, Role: "owner", Scope: access.Scope{OrganizationID: organization.ID}, GrantedBy: owner.ID})
+	if err != nil {
+		t.Fatal(err)
+	}
+	memberBinding, err := accessService.Grant(t.Context(), access.Grant{SubjectKind: access.User, SubjectID: member.ID, Role: "viewer", Scope: access.Scope{OrganizationID: organization.ID}, GrantedBy: owner.ID})
+	if err != nil {
+		t.Fatal(err)
+	}
+	project, err := organizationService.CreateProject(t.Context(), organizations.CreateProject{OrganizationID: organization.ID, Slug: "narrow", Name: "Narrow"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if _, err = accessService.Grant(t.Context(), access.Grant{SubjectKind: access.User, SubjectID: member.ID, Role: "viewer", Scope: access.Scope{OrganizationID: organization.ID, ProjectID: project.ID}, GrantedBy: owner.ID}); err != nil {
+		t.Fatal(err)
+	}
+
+	members, err := organizationService.Members(t.Context(), organization.ID, 10)
+	if err != nil || len(members) != 2 || !membershipPresent(members, owner.ID, "active") || !membershipPresent(members, member.ID, "active") {
+		t.Fatalf("members=%+v err=%v", members, err)
+	}
+	direct, err := accessService.OrganizationUserBindings(t.Context(), organization.ID, 10)
+	if err != nil || len(direct) != 2 {
+		t.Fatalf("direct=%+v err=%v", direct, err)
+	}
+
+	type replacementResult struct {
+		binding access.Binding
+		err     error
+	}
+	start := make(chan struct{})
+	results := make(chan replacementResult, 2)
+	for _, requestID := range []string{"request-member-owner-one", "request-member-owner-two"} {
+		requestID := requestID
+		go func() {
+			<-start
+			binding, replaceErr := accessService.ReplaceOrganizationUserRole(t.Context(), access.OrganizationUserRoleChange{OrganizationID: organization.ID, UserID: member.ID, Role: "owner", ActorUserID: owner.ID, RequestID: requestID, ExpectedBindingIDs: []string{memberBinding.ID}})
+			results <- replacementResult{binding: binding, err: replaceErr}
+		}()
+	}
+	close(start)
+	var memberOwner access.Binding
+	var successful, conflicted int
+	for range 2 {
+		result := <-results
+		switch {
+		case result.err == nil:
+			successful++
+			memberOwner = result.binding
+		case errors.Is(result.err, access.ErrRoleChangeConflict):
+			conflicted++
+		default:
+			t.Fatalf("concurrent replacement err=%v", result.err)
+		}
+	}
+	if successful != 1 || conflicted != 1 {
+		t.Fatalf("concurrent replacements success=%d conflict=%d", successful, conflicted)
+	}
+	if _, err = accessService.ReplaceOrganizationUserRole(t.Context(), access.OrganizationUserRoleChange{OrganizationID: organization.ID, UserID: member.ID, Role: "viewer", ActorUserID: owner.ID, RequestID: "request-stale", ExpectedBindingIDs: []string{memberBinding.ID}}); !errors.Is(err, access.ErrRoleChangeConflict) {
+		t.Fatalf("stale replacement err=%v", err)
+	}
+	if _, err = accessService.ReplaceOrganizationUserRole(t.Context(), access.OrganizationUserRoleChange{OrganizationID: organization.ID, UserID: member.ID, Role: "owner", ActorUserID: owner.ID, RequestID: "request-unchanged", ExpectedBindingIDs: []string{memberOwner.ID}}); !errors.Is(err, access.ErrRoleUnchanged) {
+		t.Fatalf("unchanged replacement err=%v", err)
+	}
+	ownerViewer, err := accessService.ReplaceOrganizationUserRole(t.Context(), access.OrganizationUserRoleChange{OrganizationID: organization.ID, UserID: owner.ID, Role: "viewer", ActorUserID: member.ID, RequestID: "request-owner-viewer", ExpectedBindingIDs: []string{ownerBinding.ID}})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if _, err = accessService.ReplaceOrganizationUserRole(t.Context(), access.OrganizationUserRoleChange{OrganizationID: organization.ID, UserID: member.ID, Role: "viewer", ActorUserID: member.ID, RequestID: "request-last-owner", ExpectedBindingIDs: []string{memberOwner.ID}}); !errors.Is(err, access.ErrLastOwner) {
+		t.Fatalf("last-owner demotion err=%v", err)
+	}
+	if _, err = accessService.ReplaceOrganizationUserRole(t.Context(), access.OrganizationUserRoleChange{OrganizationID: organization.ID, UserID: owner.ID, Role: "owner", ActorUserID: member.ID, RequestID: "request-restore-owner", ExpectedBindingIDs: []string{ownerViewer.ID}}); err != nil {
+		t.Fatal(err)
+	}
+	if err = organizationService.SetMembershipStatus(t.Context(), organization.ID, member.ID, "suspended", owner.ID, "request-suspend"); err != nil {
+		t.Fatal(err)
+	}
+	members, err = organizationService.Members(t.Context(), organization.ID, 10)
+	if err != nil || len(members) != 2 || !membershipPresent(members, member.ID, "suspended") {
+		t.Fatalf("suspended members=%+v err=%v", members, err)
+	}
+	if _, err = accessService.ReplaceOrganizationUserRole(t.Context(), access.OrganizationUserRoleChange{OrganizationID: organization.ID, UserID: member.ID, Role: "viewer", ActorUserID: owner.ID, RequestID: "request-suspended", ExpectedBindingIDs: []string{memberOwner.ID}}); err == nil {
+		t.Fatal("suspended member role was replaced")
+	}
+	if err = organizationService.SetMembershipStatus(t.Context(), organization.ID, member.ID, "active", owner.ID, "request-reactivate"); err != nil {
+		t.Fatal(err)
+	}
+
+	duplicateAudit := access.AuditEvent{ID: "audit-duplicate-1234", OrganizationID: organization.ID, ActorUserID: owner.ID, Action: "access.role.replace", ResourceType: "user", ResourceID: member.ID, RequestID: "request-rollback", Summary: "Direct organization role replaced", CreatedAt: now}
+	if err = store.AppendAccessAudit(t.Context(), duplicateAudit); err != nil {
+		t.Fatal(err)
+	}
+	replacement := access.Binding{ID: "binding-rollback-1234", SubjectKind: access.User, SubjectID: member.ID, Role: "viewer", Scope: access.Scope{OrganizationID: organization.ID}, GrantedBy: owner.ID, GrantedAt: now}
+	if err = store.ReplaceOrganizationUserRole(t.Context(), []string{memberOwner.ID}, replacement, "owner", duplicateAudit); err == nil {
+		t.Fatal("audit failure did not roll back role replacement")
+	}
+	direct, err = store.OrganizationUserBindings(t.Context(), organization.ID, 10)
+	if err != nil {
+		t.Fatal(err)
+	}
+	var memberRoles []string
+	for _, binding := range direct {
+		if binding.SubjectID == member.ID {
+			memberRoles = append(memberRoles, binding.ID+":"+binding.Role)
+		}
+	}
+	if len(memberRoles) != 1 || memberRoles[0] != memberOwner.ID+":owner" {
+		t.Fatalf("rollback member roles=%v", memberRoles)
+	}
+	assertCount(t, store, `SELECT COUNT(*) FROM gwf_access_bindings WHERE id=?`, replacement.ID, 0)
+}
+
+func membershipPresent(values []organizations.Membership, userID, status string) bool {
+	for _, value := range values {
+		if value.UserID == userID && value.Status == status {
+			return true
+		}
+	}
+	return false
+}
diff --git a/docs/DOGFOOD.md b/docs/DOGFOOD.md
index 7169a2c..1ed2a22 100644
--- a/docs/DOGFOOD.md
+++ b/docs/DOGFOOD.md
@@ -54,3 +54,9 @@ application concern belongs in the shared module.
   service now permits an explicit development port only when applications opt
   in and the RP ID is `localhost` or reserved `.test`; production origins keep
   the original portless default.
+- Gamertan's staff-access page exposed a dangerous composition gap between
+  individual grant/revoke calls. Foundations now owns one optimistic,
+  transactional direct-role replacement that preserves the final active
+  owner and appends its audit before commit. The application still owns route
+  authorization, role presentation, CSRF, and the exact fresh-passkey
+  operation binding.
diff --git a/docs/GETTING_STARTED.md b/docs/GETTING_STARTED.md
index 9d72c1a..fb6a6fd 100644
--- a/docs/GETTING_STARTED.md
+++ b/docs/GETTING_STARTED.md
@@ -26,7 +26,7 @@ The packages are ordinary Go imports. Pin the current preview and verify its
 module checksum:
 
 ```bash
-go get gamertan.com/web/requestmeta@v0.1.0-preview.15
+go get gamertan.com/web/requestmeta@v0.1.0-preview.16
 go mod verify
 ```
 
diff --git a/docs/MODULES.md b/docs/MODULES.md
index a001e06..13c5413 100644
--- a/docs/MODULES.md
+++ b/docs/MODULES.md
@@ -18,7 +18,7 @@ import "gamertan.com/web/requestmeta"
 and request the containing module at an exact version:
 
 ```bash
-go get gamertan.com/web/requestmeta@v0.1.0-preview.15
+go get gamertan.com/web/requestmeta@v0.1.0-preview.16
 ```
 
 Only imported packages are compiled and linked. The packages nevertheless
diff --git a/docs/ORGANIZATIONS.md b/docs/ORGANIZATIONS.md
index c17c659..c4f7008 100644
--- a/docs/ORGANIZATIONS.md
+++ b/docs/ORGANIZATIONS.md
@@ -22,6 +22,18 @@ team membership can be removed independently. Configure `OwnerRole` when
 constructing the service before exposing membership-removal operations. The
 SQLite adapter then refuses to suspend or remove the final active direct owner.
 
+For a reviewed access-administration page, use `organizations.Members` to list
+bounded active and suspended memberships, and
+`access.OrganizationUserBindings` to list only current direct,
+organization-wide user roles. The latter intentionally excludes team grants
+and project, environment, or service bindings. Replace a member's direct role
+with `access.ReplaceOrganizationUserRole`, passing the exact displayed binding
+IDs as `ExpectedBindingIDs`. The SQLite adapter serializes that replacement,
+rejects stale state, writes the new binding and audit event atomically, and
+will not demote the final active direct owner. The application must still
+authorize the administrator and bind any required fresh passkey assertion to
+the organization, target user, target role, and expected IDs.
+
 `access.Service` evaluates a permission against a complete resource scope:
 
 ```go
diff --git a/organizations/organizations.go b/organizations/organizations.go
index 4a29bcd..c9d7f64 100644
--- a/organizations/organizations.go
+++ b/organizations/organizations.go
@@ -107,6 +107,7 @@ type Repository interface {
 	Invitations(context.Context, string, int) ([]Invitation, error)
 	RevokeInvitation(context.Context, string, string, time.Time, AuditEvent) error
 	AcceptInvitation(context.Context, [32]byte, string, time.Time, AuditEvent) error
+	OrganizationMemberships(context.Context, string, int) ([]Membership, error)
 	MembershipsForUser(context.Context, string) ([]Membership, error)
 	TeamsForUser(context.Context, string, string) ([]Team, error)
 }
@@ -331,6 +332,16 @@ func (service *Service) Memberships(ctx context.Context, userID string) ([]Membe
 	return service.repository.MembershipsForUser(ctx, userID)
 }
 
+// Members returns a bounded, stable list of active and suspended memberships
+// for one organization. Authorization remains an application concern because
+// the same storage primitive serves different organization policies.
+func (service *Service) Members(ctx context.Context, organizationID string, limit int) ([]Membership, error) {
+	if !idPattern.MatchString(organizationID) || limit < 1 || limit > 2000 {
+		return nil, errors.New("organizations: invalid member query")
+	}
+	return service.repository.OrganizationMemberships(ctx, organizationID, limit)
+}
+
 func (service *Service) Teams(ctx context.Context, organizationID, userID string) ([]Team, error) {
 	if !idPattern.MatchString(organizationID) || !idPattern.MatchString(userID) {
 		return nil, errors.New("organizations: invalid team query")
diff --git a/organizations/organizations_test.go b/organizations/organizations_test.go
index 016ae88..b78faf3 100644
--- a/organizations/organizations_test.go
+++ b/organizations/organizations_test.go
@@ -52,6 +52,7 @@ type repositoryStub struct {
 	invitation    Invitation
 	invitationErr error
 	acceptedUser  string
+	members       []Membership
 }
 
 func (repository *repositoryStub) CreateOrganization(_ context.Context, organization Organization, _ Membership, _ AuditEvent) error {
@@ -109,4 +110,7 @@ func (repository *repositoryStub) AcceptInvitation(_ context.Context, _ [32]byte
 func (*repositoryStub) MembershipsForUser(context.Context, string) ([]Membership, error) {
 	return nil, nil
 }
+func (repository *repositoryStub) OrganizationMemberships(context.Context, string, int) ([]Membership, error) {
+	return repository.members, nil
+}
 func (*repositoryStub) TeamsForUser(context.Context, string, string) ([]Team, error) { return nil, nil }