diff --git a/CHANGELOG.md b/CHANGELOG.md
index 32a5b5f..e56a4c8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,17 @@
+# v2.4.0 - 2026-08-10
+
+### Added
+- **Live catalog replication.** A spoke now stays in sync after joining instead of only getting a one-time snapshot: it registers its own endpoint with the master at join time (`POST /api/site/spokes`, Bearer the site join key), and every successful master catalog write fires a fire-and-forget push (`utils/site_replicate.js`) at every registered spoke, concurrently — one unreachable spoke never blocks or delays delivery to another. The spoke's `POST /api/site/resync` handler re-runs the same tested export-pull-and-import path used at join time rather than applying a partial diff.
+- **Identical-directory agent-signing key.** `POST /api/site/export` now best-effort includes the master's agent-signing key; a spoke adopts it via `agent_keys.adopt()` on both join and every resync, so any site's `sso-manager-node` can validly sign a command for any agent enrolled at any other site (a deliberate blast-radius tradeoff for this deployment's small, trusted scale — see `theta-suite`'s `docs/MULTI_SITE_SPEC.md` §2).
+- **Coordinated master promotion.** `POST /api/directory-admin/site-promote` now demotes the previous master as part of the same action (mints it a fresh join key, calls its new `POST /api/site/demote`) instead of leaving a manual two-step gap where two nodes could both believe they're master. Best-effort: an unreachable old master (the WAN-outage scenario this control exists for) never blocks the local promotion — the response's `handoff` field reports what happened.
+- **Master Site modal UI**: new "Live Replication" (spoke) / "Registered Spokes" (master) status rows; the join form gained a "this site's own reachable URL" field (prefilled from the browser origin) wired to the `selfUrl` the join API already supported but the UI never sent — a UI-driven join previously never registered for live replication, only the `setup.sh` bootstrap path did; the promote button's success toast now reports the actual handoff result.
+- New `nodejs/models/site_spoke.js` (registered spokes + their push tokens) and `docker-compose.multisite-e2e.yml` + `test/multisite_join_e2e.js` (real two-container master+spoke regression test covering join, live replication, promotion, and demotion end to end).
+
+### Fixed
+- **`site-promote`'s god_admin check was dead on arrival.** It read `req.user.groups`, a field nothing in the codebase ever populates (every other admin gate resolves membership live via `permission.byGroup()`/`Group.list(user.dn)`, which also handles nested-group membership) — the check silently evaluated to an empty array on every request, so promotion returned 403 for every user, including a real god_admin, since it shipped in v2.0.0. Only surfaced by the live e2e test, not by inspection.
+- **The read-only write-gate blocked `site-promote` on a spoke before its handler could run** — the one mutating request a spoke must be able to make to itself. Exempted `/site-promote` from the gate.
+- **`GET /api/site/config` was returning `masterJoinKey` and `replicationPushToken`** — live credentials — directly in the JSON response to any admin session. Replaced with boolean derivatives (`hasMasterJoinKey`, `liveReplication`).
+
 # v2.3.0 - 2026-08-10
 
 ### Added
diff --git a/Dockerfile.test-runner b/Dockerfile.test-runner
index 0f0d142..338333b 100644
--- a/Dockerfile.test-runner
+++ b/Dockerfile.test-runner
@@ -50,6 +50,8 @@ COPY test/seed-test-user.sh /usr/local/bin/seed-test-user
 RUN chmod +x /usr/local/bin/seed-test-user
 # End-to-end LDAP tunnel test client (docker-compose.e2e.yml)
 COPY test/tunnel_e2e.js ./test/tunnel_e2e.js
+# End-to-end multi-site join test client (docker-compose.multisite-e2e.yml)
+COPY test/multisite_join_e2e.js ./test/multisite_join_e2e.js
 
 # Default command: seed the test user, then run the test suite
 CMD ["sh", "-c", "seed-test-user && npm test"]
diff --git a/directory_spec.md b/directory_spec.md
index e9fc1d4..f0dd08a 100644
--- a/directory_spec.md
+++ b/directory_spec.md
@@ -399,3 +399,7 @@ The Directory incorporates a **4-tier Driver Resolution Engine** (`services/driv
 - `POST /api/directory-admin/resources/:id/driver-action` — Execute management action (`{ action, params }`)
 - `GET /api/directory-admin/resources/:id/driver-logs` — Tail log output (`?lines=100`)
 
+## 11. Multi-Site
+
+This directory can run across multiple sites (one **master** with write authority, any number of **spoke** read-only replicas that stay live-synced after joining), coordinate master promotion, and share the agent-signing key across sites. Full design and operational detail: [`docs/site-join.md`](docs/site-join.md) and, at the suite level, `theta-suite`'s `docs/MULTI_SITE_SPEC.md`.
+
diff --git a/docker-compose.multisite-e2e.yml b/docker-compose.multisite-e2e.yml
new file mode 100644
index 0000000..3f343e7
--- /dev/null
+++ b/docker-compose.multisite-e2e.yml
@@ -0,0 +1,69 @@
+# End-to-end test of the real, shipped multi-site join flow (docs/site-join.md).
+#
+# Spins up two full all-in-one instances (app + bundled slapd each, like
+# docker-compose.repl-test.yml) — "master" and "spoke" — plus a client that
+# drives the actual HTTP API a human/operator would use: mint a site join key
+# on master, join from spoke, verify the spoke adopted the catalog, went
+# read-only, and reports live WAN health.
+#
+#   docker compose -f docker-compose.multisite-e2e.yml up --build --abort-on-container-exit
+#   # exit code 0 = MULTISITE E2E PASS
+#
+# slapcat (used by POST /api/site/export) only sees the LDAP data of the
+# container it runs in, so this MUST use the all-in-one image (master and
+# spoke each carry their own slapd) — the split ldap+redis+app harness used
+# by docker-compose.test.yml/e2e.yml won't exercise export/join at all.
+
+services:
+  master:
+    build:
+      context: .
+      dockerfile: Dockerfile.openldap
+    container_name: multisite_e2e_master
+    environment:
+      - LDAP_BASE_DN=dc=master,dc=test
+      - LDAP_ADMIN_PASS=secret
+      - ORG_NAME=E2E Master
+      - app_oauth__jwtSecret=e2e-multisite-master-jwt-secret
+    healthcheck:
+      test: ["CMD-SHELL", "wget -qO- http://localhost:3001/health >/dev/null 2>&1"]
+      interval: 2s
+      timeout: 3s
+      retries: 40
+      start_period: 5s
+
+  spoke:
+    build:
+      context: .
+      dockerfile: Dockerfile.openldap
+    container_name: multisite_e2e_spoke
+    environment:
+      - LDAP_BASE_DN=dc=spoke,dc=test
+      - LDAP_ADMIN_PASS=secret
+      - ORG_NAME=E2E Spoke
+      - app_oauth__jwtSecret=e2e-multisite-spoke-jwt-secret
+    healthcheck:
+      test: ["CMD-SHELL", "wget -qO- http://localhost:3001/health >/dev/null 2>&1"]
+      interval: 2s
+      timeout: 3s
+      retries: 40
+      start_period: 5s
+
+  client:
+    build:
+      context: .
+      dockerfile: Dockerfile.test-runner
+    command: ["sh", "-c", "node test/multisite_join_e2e.js"]
+    environment:
+      - MASTER_URL=http://master:3001
+      - SPOKE_URL=http://spoke:3001
+      - MASTER_LDAP_HOST=master
+      - MASTER_BASE_DN=dc=master,dc=test
+      - SPOKE_LDAP_HOST=spoke
+      - SPOKE_BASE_DN=dc=spoke,dc=test
+      - LDAP_ADMIN_PASS=secret
+    depends_on:
+      master:
+        condition: service_healthy
+      spoke:
+        condition: service_healthy
diff --git a/docs/site-join.md b/docs/site-join.md
index 871d6c2..6e4cc3a 100644
--- a/docs/site-join.md
+++ b/docs/site-join.md
@@ -6,9 +6,7 @@ copy for local latency and autonomy (see the root `MULTI_SITE_SPEC.md` for the
 full architecture). This page covers the server endpoints that make a spoke
 "join" an existing master.
 
-> Status: **server endpoints + UI + setup.sh wiring.** A fresh bring-up can
-> adopt a master directory via the Directory UI or via `setup.env`, and a
-> joined spoke is read-only with live WAN health.
+> Status: **server endpoints + UI + setup.sh wiring, live replication, coordinated promotion.** A fresh bring-up can adopt a master directory via the Directory UI or via `setup.env`; a joined spoke is read-only with live WAN health, stays in sync after joining (not just a one-time snapshot), and can be promoted to master with the old master demoted as part of the same action.
 
 ## The flow
 
@@ -19,13 +17,58 @@ full architecture). This page covers the server endpoints that make a spoke
    - **setup.sh**: set `CFG_MASTER_DIRECTORY_URL` + `CFG_MASTER_DIRECTORY_JOIN_KEY`
      in `setup.env` before the first run.
 3. The spoke pulls the master's directory export (LDAP tree + resource
-   catalog), imports it, and persists its own spoke role
+   catalog + agent-signing key), imports it, and persists its own spoke role
    (`isMaster: false`, `masterUrl`, `siteSlug`) in `/config/site.json`.
+4. If the spoke also knows its own reachable URL (`selfUrl` — `setup.sh` passes
+   `https://$CFG_SSO_HOST` automatically), it registers itself with the master
+   (`POST /api/site/spokes`) so the master can push live updates back to it
+   afterward — see **Live replication** below. Without `selfUrl` the join still
+   succeeds; the spoke just stays a one-time snapshot.
 
 Joining is allowed only on a **fresh install** (no users beyond the bootstrap
 admin, no enrolled agents) — the join endpoint enforces this, so a populated
 directory can never be merged into a master's.
 
+## Live replication (not a one-time snapshot)
+
+A registered spoke stays in sync: every successful catalog write on the
+master fires a fire-and-forget push (`utils/site_replicate.js`) at every
+registered spoke, concurrently — one unreachable spoke never blocks or delays
+delivery to another. The spoke's `POST /api/site/resync` handler (called by
+that push) re-runs the same export-pull-and-import logic used at join time,
+so there's exactly one tested code path for "make my catalog match the
+master's," not a separate diff-application mechanism.
+
+The agent-signing key travels the same path: `POST /api/site/export`
+best-effort includes it, and the spoke adopts it via `agent_keys.adopt()` on
+both join and every resync. Every site holding the same signing key means any
+site's `sso-manager-node` can validly sign a command for any agent enrolled
+at any other site — a deliberate tradeoff (see `MULTI_SITE_SPEC.md` §2)
+accepted for this deployment's small, trusted scale. Don't extend this
+pattern to a larger/adversarial-tenant deployment without revisiting it.
+
+## Coordinated master promotion
+
+`POST /api/directory-admin/site-promote` (`god_admin` only) promotes this
+node to master as **one coordinated action**, not a manual two-step
+demote-then-promote:
+
+1. If this node currently has a master on file, it mints a fresh join key and
+   calls that master's `POST /api/site/demote` (authenticated with the join
+   key this node already holds), handing over the new key so the demoted node
+   can keep talking to the new master afterward.
+2. This step is **best-effort** — an unreachable old master (the WAN-outage
+   scenario this whole control exists for) never blocks the local promotion.
+   The response's `handoff` field reports what happened
+   (`"previous master demoted"`, an HTTP failure, or "unreachable, promoted
+   locally anyway") so the operator can reconcile it manually if needed.
+3. Every known spoke gets a fire-and-forget `master-promoted` resync ping so
+   they pick up the new master on their next sync.
+
+The Master Site modal's **Promote to Master** button surfaces the `handoff`
+result in a toast so the operator sees immediately whether the old master was
+actually reached.
+
 ## Endpoints
 
 | Method | Path | Purpose |
@@ -35,9 +78,13 @@ directory can never be merged into a master's.
 | `POST` | `/api/site/join-keys/:id/revoke` | Stop it accepting new joins |
 | `DELETE` | `/api/site/join-keys/:id` | Remove it |
 | `GET` | `/api/site/config` | Current role (isMaster, masterUrl, siteSlug) |
-| `POST` | `/api/site/export` | Master directory export (Bearer `stj_` key) |
+| `POST` | `/api/site/export` | Master directory export incl. agent-signing key (Bearer `stj_` key) |
 | `POST` | `/api/site/ping` | Lightweight master reachability probe (Bearer `stj_` key) |
-| `POST` | `/api/site/join` | Adopt a master directory (admin session) |
+| `POST` | `/api/site/join` | Adopt a master directory + register for live replication (admin session) |
+| `POST` | `/api/site/spokes` | Register a spoke's endpoint for live replication (Bearer `stj_` key, called by the spoke right after join) |
+| `POST` | `/api/site/resync` | Re-pull the master's export (Bearer the spoke's own `pushToken`, called by the master's fire-and-forget push) |
+| `POST` | `/api/site/demote` | Step down to spoke of a new master (Bearer `stj_` key, called by the newly-promoted node) |
+| `POST` | `/api/directory-admin/site-promote` | Promote this node to master, coordinating demotion of the old one (`god_admin` session) |
 
 ## Behavior after joining (spoke)
 
@@ -74,3 +121,25 @@ already joined reports "already a spoke" and setup continues (idempotent).
   gated on both sides.
 - The join key is stored on the spoke only so it can reach the master for WAN
   health (and, in a later layer, write-proxy).
+- `pushToken` (the credential a spoke stores so it can recognize a legitimate
+  resync push from its master) is minted fresh per spoke registration and, by
+  design, kept in retrievable form on the master — unlike a join key, it's a
+  credential the master must keep *presenting*, not just verifying, so it
+  can't be one-way hashed. Compare `models/site_spoke.js`'s doc comment for
+  why that's the correct tradeoff, not an oversight.
+- Every site sharing one agent-signing key (see **Live replication** above)
+  means a compromised spoke — including the smallest, least-secured one — has
+  the same agent-command authority as the master. Accepted for this
+  deployment's scale; see `MULTI_SITE_SPEC.md` §2 before reusing this pattern
+  somewhere that assumption doesn't hold.
+
+## Not yet built
+
+- Traffic between sites (join/export/resync) still goes over the open
+  network path that already reaches the target — it does not route over the
+  WireGuard mesh `theta-gateway` can now establish (see `MULTI_SITE_SPEC.md`).
+- A no-inbound spoke (no public IP at all) still can't join — the mechanism
+  for a master to relay through the mesh to such a spoke is verified as
+  working, but nothing automates creating that route yet.
+- OpenBao secret replication covers only the agent-signing key; LDAP admin
+  creds, JWT secret, and other per-deployment secrets aren't synced.
diff --git a/nodejs/models/index.js b/nodejs/models/index.js
index d9d245f..eb96717 100644
--- a/nodejs/models/index.js
+++ b/nodejs/models/index.js
@@ -22,6 +22,7 @@ const { SharedSecretGrant } = require('./shared_secret_grant');
 const { VaultAppToken } = require('./vault_app_token');
 const { Agent, AgentJoinKey } = require('./agent');
 const { SiteJoinKey } = require('./site_join_key');
+const { SiteSpoke } = require('./site_spoke');
 async function initORM() {
   const ormConf = conf.orm || {
     dialect: 'sqlite',
@@ -36,7 +37,7 @@ async function initORM() {
       conf: { orm: ormConf },
       models: [
         Resource, ResourceEdge, ResourceGroup, AccessRequest, Webhook, PluginInstance,
-        SharedSecret, SharedSecretGrant, VaultAppToken, Agent, AgentJoinKey, SiteJoinKey,
+        SharedSecret, SharedSecretGrant, VaultAppToken, Agent, AgentJoinKey, SiteJoinKey, SiteSpoke,
         Token, AuthToken, InviteToken, ImpersonationToken, PasswordResetToken, OtpToken, ServiceToken
       ]
     });
diff --git a/nodejs/models/site_spoke.js b/nodejs/models/site_spoke.js
new file mode 100644
index 0000000..3763f56
--- /dev/null
+++ b/nodejs/models/site_spoke.js
@@ -0,0 +1,42 @@
+'use strict';
+
+const crypto = require('crypto');
+const { Model } = require('@simpleworkjs/orm');
+
+// A spoke known to THIS node while it's acting as master — the registry that
+// makes live replication possible. A spoke registers itself here (POST
+// /api/site/spokes, authenticated by the same join key it used to join)
+// right after adopting the master's export, handing over its own reachable
+// endpoint. In return it's issued a `pushToken`: a shared secret the master
+// then presents on every future POST <spoke endpoint>/api/site/resync call.
+//
+// This is a DIFFERENT credential direction than SiteJoinKey: a join key is
+// presented TO the master and only ever needs to be verified (so it's stored
+// hashed, like a password). pushToken is presented BY the master, repeatedly,
+// so it has to be retrievable here -- there is no getting around storing it
+// in plaintext on the master, the same way Webhook.secret is (see
+// services/webhook_emitter.js) for the same reason (an HMAC/bearer credential
+// the sender must keep re-presenting, not a one-time secret only ever
+// verified).
+class SiteSpoke extends Model {
+	static generatePushToken() {
+		return crypto.randomBytes(24).toString('base64url');
+	}
+
+	static fields = {
+		id: { type: 'uuid', primaryKey: true },
+		endpoint: { type: 'string', isRequired: true, unique: true },
+		siteSlug: { type: 'string' },
+		pushToken: { type: 'string', isRequired: true },
+		created_on: { type: 'integer' },
+		last_seen_on: { type: 'integer' }
+	};
+
+	toPublic() {
+		const data = this.toJSON ? this.toJSON() : { ...this };
+		delete data.pushToken;
+		return data;
+	}
+}
+
+module.exports = { SiteSpoke };
diff --git a/nodejs/package.json b/nodejs/package.json
index 6d05ab5..4f50e44 100755
--- a/nodejs/package.json
+++ b/nodejs/package.json
@@ -1,6 +1,6 @@
 {
   "name": "t42-theta-directory",
-  "version": "2.3.0",
+  "version": "2.4.0",
   "description": "A very simple LDAP management and SSO system",
   "author": [
     {
@@ -11,7 +11,7 @@
   "scripts": {
     "start": "node ./bin/www",
     "dev": "npx nodemon --ignore public/ ./bin/www",
-    "test": "NODE_ENV=test jest tests/groups.test.js tests/subtypes.test.js tests/site_join.test.js tests/site_config.test.js --forceExit"
+    "test": "NODE_ENV=test jest tests/groups.test.js tests/subtypes.test.js tests/site_join.test.js tests/site_config.test.js tests/site_replicate.test.js --forceExit"
   },
   "jest": {
     "testEnvironment": "node",
diff --git a/nodejs/routes/api_directory_admin.js b/nodejs/routes/api_directory_admin.js
index 2856fbc..7da419b 100644
--- a/nodejs/routes/api_directory_admin.js
+++ b/nodejs/routes/api_directory_admin.js
@@ -2,6 +2,7 @@
 const router = require('express').Router();
 const permission = require('../utils/permission');
 const { Resource, ResourceEdge, ResourceGroup } = require('../models/resource');
+const { SiteJoinKey } = require('../models/site_join_key');
 const { Group } = require('../models/group_ldap');
 const { User } = require('../models/user_ldap');
 const { cnFromDn } = require('../utils/user_groups');
@@ -9,6 +10,7 @@ const { projectResources } = require('@simpleworkjs/directory-schema');
 
 const SUPER_ADMIN_GROUP = permission.SUPER_ADMIN_GROUP;
 const groups = require('../utils/groups');
+const meshReplicate = require('../utils/site_replicate');
 
 // Make `childCn` a member of `parentCn`, i.e. everyone in the child is
 // transitively in the parent. Idempotent and non-fatal: "already a member" is
@@ -252,19 +254,38 @@ router.get('/resources', async (req, res, next) => {
   } catch (err) { next(err); }
 });
 
-// ── Spoke read-only enforcement ─────────────────────────────────────────────
+// ── Spoke read-only enforcement + live replication trigger ──────────────────
 // On a joined spoke the catalog is a copy of the master's; directory writes
 // must go to the master (MULTI_SITE_SPEC.md — spoke = read-only catalog). Any
 // mutating request below this point is rejected on a spoke with a pointer to
 // the master. (site-status / site-promote live AFTER this middleware and are
 // not directory writes.)
+//
+// On the MASTER, a successful mutation here fires a fire-and-forget resync
+// push (utils/site_replicate.js) at every registered spoke, so the shipped
+// join flow's one-time snapshot doesn't go stale the moment the catalog
+// changes. Fires on res.on('finish') (after the response is actually sent,
+// status known) rather than before the handler runs, so a write that fails
+// validation never triggers a pointless replication round-trip.
+// /site-promote is deliberately exempt below: it's the ONE mutating request a
+// spoke must be able to make to itself (that's the entire point -- a spoke
+// promoting itself to master). Without this exemption the gate 403s the
+// promotion request before it ever reaches the handler, since this
+// middleware is registered ahead of router.post('/site-promote', ...) later
+// in the file and Express matches router.use() against every path.
 router.use((req, res, next) => {
-  if (['POST', 'PUT', 'DELETE', 'PATCH'].includes(req.method)) {
+  const mutating = ['POST', 'PUT', 'DELETE', 'PATCH'].includes(req.method);
+  if (mutating && req.path !== '/site-promote') {
     const cfg = siteConfig.get();
     if (!cfg.isMaster) {
       const hint = cfg.masterUrl ? ' Directory writes must go to the master at ' + cfg.masterUrl + '.' : '';
       return res.status(403).json({ status: 'error', message: 'This node is a spoke (read-only catalog).' + hint });
     }
+    res.on('finish', () => {
+      if (res.statusCode >= 200 && res.statusCode < 300) {
+        meshReplicate.replicateToSpokes(`${req.method} ${req.path}`);
+      }
+    });
   }
   next();
 });
@@ -906,6 +927,7 @@ router.post('/discovered/merge', async (req, res, next) => {
 const siteConfig = require('../utils/site_config');
 const { siteIsFresh } = require('../utils/site_join');
 const { Agent } = require('../models/agent');
+const { SiteSpoke } = require('../models/site_spoke');
 
 // probeMasterHealth checks whether this (spoke) node can reach its master over
 // the site join key. The master's /api/site/ping is deliberately lightweight.
@@ -941,6 +963,13 @@ router.get('/site-status', async (req, res, next) => {
     if (cfg.isMaster) {
       canJoin = await siteIsFresh({ User, Agent }).catch(() => false);
     }
+    // registeredSpokesCount (master) / liveReplication (spoke): surfaces
+    // whether live replication is actually wired up, not just whether the
+    // join itself succeeded -- a spoke that joined without `selfUrl` (e.g.
+    // via an older bootstrap, or the UI form before it grew the field) is
+    // fully joined but silently stuck on the one-time snapshot, which was
+    // otherwise invisible anywhere in the UI.
+    const registeredSpokesCount = cfg.isMaster ? await SiteSpoke.list().then(l => l.length).catch(() => 0) : 0;
     res.json({
       status: 'ok',
       config: {
@@ -949,7 +978,9 @@ router.get('/site-status', async (req, res, next) => {
         siteSlug: cfg.siteSlug,
         wanConnected,
         siteMode: cfg.isMaster ? 'master' : 'spoke',
-        canJoin
+        canJoin,
+        liveReplication: !cfg.isMaster ? !!cfg.replicationPushToken : undefined,
+        registeredSpokesCount
       },
       sitesCount: sites.length,
       sites: sites.map(s => ({ id: s.id, name: s.name, slug: s.slug })),
@@ -960,21 +991,67 @@ router.get('/site-status', async (req, res, next) => {
 
 router.post('/site-promote', async (req, res, next) => {
   try {
-    // Check god_admin privileges
-    const userGroups = req.user && req.user.groups ? req.user.groups : [];
-    const isGodAdmin = userGroups.includes('god_admin') || userGroups.includes(SUPER_ADMIN_GROUP);
+    // god_admin privilege check. This used to read req.user.groups, which
+    // nothing in the codebase ever populates -- User.get() (what
+    // Auth.checkToken returns as req.user) has no .groups field; every other
+    // admin gate in this app resolves membership live via
+    // permission.byGroup()/Group.list(user.dn), which also correctly
+    // resolves NESTED group membership (a user who is god_admin via a nested
+    // group, not just direct membership). The old check silently evaluated
+    // to an empty array for every request, making this endpoint
+    // unreachable for ANY user -- caught by the multi-site e2e promotion
+    // test (docker-compose.multisite-e2e.yml), not by inspection.
+    const isGodAdmin = await permission.byGroup(req.user, [SUPER_ADMIN_GROUP]).catch(() => false);
     if (!isGodAdmin) {
       return res.status(403).json({ status: 'error', message: 'Master promotion requires explicit god_admin authority' });
     }
 
-    siteConfig.save({ isMaster: true, masterUrl: '' });
+    // MULTI_SITE_SPEC.md §3.2: promotion is ONE coordinated action, never a
+    // manual two-step "demote the old one first" — if we currently know a
+    // master (we were a spoke), hand it off before flipping ourselves. This
+    // is best-effort: an unreachable old master (the whole point of the
+    // WAN-outage promotion scenario §3 describes) must never block a
+    // god_admin's local promotion, it's just reported so the operator can
+    // reconcile it manually.
+    const beforeCfg = siteConfig.get();
+    let handoffNote = 'no previous master on file (already master, or fresh install)';
+    if (!beforeCfg.isMaster && beforeCfg.masterUrl && beforeCfg.masterJoinKey) {
+      try {
+        const { raw: freshKey } = await SiteJoinKey.issue({
+          label: 'promotion-handoff-' + new Date().toISOString().slice(0, 10),
+          createdBy: req.user ? req.user.uid : 'admin'
+        });
+        const controller = new AbortController();
+        const timer = setTimeout(() => controller.abort(), 15000);
+        let resp;
+        try {
+          resp = await fetch(beforeCfg.masterUrl + '/api/site/demote', {
+            method: 'POST',
+            headers: { Authorization: 'Bearer ' + beforeCfg.masterJoinKey, 'Content-Type': 'application/json' },
+            body: JSON.stringify({ newMasterUrl: (req.body && req.body.selfUrl) || '', newJoinKey: freshKey }),
+            signal: controller.signal
+          });
+        } finally { clearTimeout(timer); }
+        handoffNote = resp.ok ? 'previous master demoted' : ('previous master demote failed: HTTP ' + resp.status);
+      } catch (e) {
+        handoffNote = 'previous master unreachable (' + e.message + ') — promoted locally anyway; reconcile it manually once it\'s back';
+      }
+    }
 
-    console.log(`[MULTI-SITE] Node promoted to MASTER by user ${req.user ? req.user.uid : 'admin'}`);
+    siteConfig.save({ isMaster: true, masterUrl: '', masterJoinKey: undefined });
+
+    console.log(`[MULTI-SITE] Node promoted to MASTER by user ${req.user ? req.user.uid : 'admin'} (handoff: ${handoffNote})`);
+
+    // Fire-and-forget: let every known spoke know a new master exists so
+    // their next resync targets it. (They'll also learn this the hard way if
+    // their old-master resync calls start failing, but this speeds it up.)
+    meshReplicate.replicateToSpokes('master-promoted');
 
     const cfg = siteConfig.get();
     res.json({
       status: 'ok',
       message: 'Node successfully promoted to Master Site',
+      handoff: handoffNote,
       config: {
         isMaster: true,
         masterUrl: '',
diff --git a/nodejs/routes/api_site.js b/nodejs/routes/api_site.js
index 2bcf858..f9a3f45 100644
--- a/nodejs/routes/api_site.js
+++ b/nodejs/routes/api_site.js
@@ -14,6 +14,7 @@
 // calls it with a join key), so it is defined BEFORE the auth middleware.
 
 const express = require('express');
+const crypto = require('crypto');
 const { execFile } = require('child_process');
 const { promisify } = require('util');
 const os = require('os');
@@ -25,10 +26,13 @@ const permission = require('../utils/permission');
 const conf = require('@simpleworkjs/conf');
 const { Resource, ResourceEdge } = require('../models/resource');
 const { SiteJoinKey } = require('../models/site_join_key');
+const { SiteSpoke } = require('../models/site_spoke');
+const { replicateToSpokes } = require('../utils/site_replicate');
 const User = require('../models/user');
 const { Agent } = require('../models/agent');
 const siteConfig = require('../utils/site_config');
 const { importDirectory, ldapAddArgs, baseDnFrom, siteIsFresh } = require('../utils/site_join');
+const agentKeys = require('../utils/agent_keys');
 
 const execFileAsync = promisify(execFile);
 const router = express.Router();
@@ -63,10 +67,16 @@ router.post('/export', async (req, res, next) => {
     const key = await SiteJoinKey.authenticate(rawKey);
     if (!key) return res.status(401).json({ status: 'error', message: 'invalid or revoked site join key' });
 
-    const [ldif, resources, edges] = await Promise.all([
+    const [ldif, resources, edges, signingKey] = await Promise.all([
       slurpLdif(),
       Resource.list(),
-      ResourceEdge.list()
+      ResourceEdge.list(),
+      // Best-effort: a master with no OpenBao reachable (or no key generated
+      // yet) still exports successfully -- signingKey is just omitted, and
+      // the spoke keeps whatever key (if any) it already has. Identical
+      // signing keys across sites is a nice-to-have on top of the join
+      // working at all, never a reason to fail the join.
+      agentKeys.load().then((k) => k && { privateKeyPem: k.privateKeyPem, publicKeyPem: k.publicKeyPem }).catch(() => null)
     ]);
 
     await key.update({ use_count: (key.use_count || 0) + 1, last_used_on: Math.floor(Date.now() / 1000) }).catch(() => {});
@@ -77,7 +87,8 @@ router.post('/export', async (req, res, next) => {
       baseDn: baseDnFrom(conf),
       ldif,
       resources: (resources || []).map(r => (r.toJSON ? r.toJSON() : r)),
-      edges: (edges || []).map(e => (e.toJSON ? e.toJSON() : e))
+      edges: (edges || []).map(e => (e.toJSON ? e.toJSON() : e)),
+      ...(signingKey ? { signingKey } : {})
     });
   } catch (e) { next(e); }
 });
@@ -95,6 +106,104 @@ router.post('/ping', async (req, res, next) => {
   } catch (e) { next(e); }
 });
 
+// ── Spoke registration (MASTER side, Bearer site-join-key; no admin session)
+// A spoke calls this right after adopting a join, handing over its own
+// reachable endpoint so the master can push live-replication resync pings to
+// it later (see utils/site_replicate.js). Idempotent on endpoint: calling it
+// again (e.g. a spoke re-registering after its own restart) returns the same
+// pushToken rather than minting a new one, so the spoke doesn't need to
+// re-learn a credential it already has.
+router.post('/spokes', async (req, res, next) => {
+  try {
+    const auth = req.headers.authorization || '';
+    const rawKey = auth.startsWith('Bearer ') ? auth.slice(7).trim() : '';
+    const key = await SiteJoinKey.authenticate(rawKey);
+    if (!key) return res.status(401).json({ status: 'error', message: 'invalid or revoked site join key' });
+
+    const { endpoint, siteSlug } = req.body || {};
+    if (!endpoint || !/^https?:\/\//.test(endpoint)) {
+      return res.status(400).json({ status: 'error', message: 'a valid http(s) endpoint is required' });
+    }
+
+    const now = Math.floor(Date.now() / 1000);
+    let spoke = (await SiteSpoke.list({ where: { endpoint } }))[0];
+    if (spoke) {
+      await spoke.update({ siteSlug: siteSlug || spoke.siteSlug, last_seen_on: now });
+    } else {
+      spoke = await SiteSpoke.create({
+        id: crypto.randomUUID(),
+        endpoint,
+        siteSlug: siteSlug || null,
+        pushToken: SiteSpoke.generatePushToken(),
+        created_on: now,
+        last_seen_on: now
+      });
+    }
+    logAudit('spoke_registered', { endpoint, siteSlug: spoke.siteSlug });
+    res.json({ status: 'ok', pushToken: spoke.pushToken });
+  } catch (e) { next(e); }
+});
+
+// ── Resync (SPOKE side, Bearer pushToken; no admin session) ─────────────────
+// The receiving end of utils/site_replicate.js's fire-and-forget push: the
+// master pings this when its catalog changes. Deliberately just
+// re-runs the same export-pull + import this node already did at join time
+// (adoptFromMaster below) rather than applying a partial diff -- one tested
+// code path for "make my catalog match the master's," not two.
+router.post('/resync', async (req, res, next) => {
+  try {
+    const cfg = siteConfig.get();
+    if (cfg.isMaster) return res.status(400).json({ status: 'error', message: 'this node is master; resync is a spoke-only operation' });
+
+    const auth = req.headers.authorization || '';
+    const presented = auth.startsWith('Bearer ') ? auth.slice(7).trim() : '';
+    if (!cfg.replicationPushToken || presented !== cfg.replicationPushToken) {
+      return res.status(401).json({ status: 'error', message: 'invalid resync push token' });
+    }
+    if (!cfg.masterUrl || !cfg.masterJoinKey) {
+      return res.status(409).json({ status: 'error', message: 'no master join credentials on file' });
+    }
+
+    const imp = await adoptFromMaster({ masterUrl: cfg.masterUrl, joinKey: cfg.masterJoinKey });
+    logAudit('resynced', { reason: (req.body && req.body.reason) || 'unspecified', resourcesCreated: imp.created, resourcesUpdated: imp.updated });
+    res.json({ status: 'ok', resources: { created: imp.created, updated: imp.updated, edges: imp.edgeCount } });
+  } catch (e) { next(e); }
+});
+
+// ── Demote (called on the OLD master; Bearer site-join-key; no admin session)
+// MULTI_SITE_SPEC.md §3.2: promoting a spoke must be a single coordinated
+// action, never a two-step "hope nobody's master for a while" gap. The node
+// being promoted calls this on whatever it currently believes is master,
+// using the join-key credential it already holds from when it joined --
+// authenticating "demote me" is exactly the same trust relationship as
+// authenticating "let me pull an export," so no new credential type is
+// needed for THIS direction. (The new master's future ability to push
+// replication/resync to the newly-demoted node is a separate credential --
+// newJoinKey below -- since that's the master->spoke direction, same as
+// every other spoke registration.)
+router.post('/demote', async (req, res, next) => {
+  try {
+    const auth = req.headers.authorization || '';
+    const rawKey = auth.startsWith('Bearer ') ? auth.slice(7).trim() : '';
+    const key = await SiteJoinKey.authenticate(rawKey);
+    if (!key) return res.status(401).json({ status: 'error', message: 'invalid or revoked site join key' });
+
+    const cfg = siteConfig.get();
+    if (!cfg.isMaster) {
+      return res.status(400).json({ status: 'error', message: 'this node is already a spoke' });
+    }
+    const { newMasterUrl, newJoinKey } = req.body || {};
+    if (!newMasterUrl || !newJoinKey) {
+      return res.status(400).json({ status: 'error', message: 'newMasterUrl and newJoinKey are required' });
+    }
+
+    const base = String(newMasterUrl).replace(/\/+$/, '');
+    siteConfig.save({ isMaster: false, masterUrl: base, masterJoinKey: newJoinKey });
+    logAudit('demoted', { demotedBy: key.keyPrefix, newMasterUrl: base });
+    res.json({ status: 'ok', message: 'Demoted to spoke of ' + base });
+  } catch (e) { next(e); }
+});
+
 // ── Everything below requires an admin session ──────────────────────────────
 router.use(middleware.auth);
 router.use(async (req, res, next) => {
@@ -110,9 +219,23 @@ router.use(async (req, res, next) => {
 });
 
 // Current multi-site role (master/spoke, site slug, master URL).
+// Never sent to the client: masterJoinKey and replicationPushToken are live
+// credentials, not display data. Callers get boolean derivatives instead
+// (hasMasterJoinKey, liveReplication) -- enough to render UI state without
+// putting a secret in a browser response.
 router.get('/config', async (req, res, next) => {
-  try { res.json({ status: 'ok', config: siteConfig.get() }); }
-  catch (e) { next(e); }
+  try {
+    const cfg = siteConfig.get();
+    const { masterJoinKey, replicationPushToken, ...safe } = cfg;
+    res.json({
+      status: 'ok',
+      config: {
+        ...safe,
+        hasMasterJoinKey: !!masterJoinKey,
+        liveReplication: !!replicationPushToken
+      }
+    });
+  } catch (e) { next(e); }
 });
 
 // ── Site join key management (admin) ────────────────────────────────────────
@@ -161,9 +284,77 @@ router.delete('/join-keys/:id', async (req, res, next) => {
 // role. Only valid on a node that is currently the master (i.e. a fresh
 // bring-up that has not joined anything yet) — see setup.sh wiring for the
 // pre-seed timing (this pass is server endpoints only).
+// Shared by /join (first adoption) and /resync (live-replication re-pull):
+// fetch the master's export and apply it locally (catalog + LDAP). Throws on
+// any failure that should surface as a 502 to the caller.
+async function adoptFromMaster({ masterUrl, joinKey }) {
+  const base = String(masterUrl).replace(/\/+$/, '');
+  const controller = new AbortController();
+  const timer = setTimeout(() => controller.abort(), 30000);
+  let resp;
+  try {
+    resp = await fetch(base + '/api/site/export', {
+      method: 'POST',
+      headers: { Authorization: 'Bearer ' + joinKey, 'Content-Type': 'application/json' },
+      body: '{}',
+      signal: controller.signal
+    });
+  } finally { clearTimeout(timer); }
+
+  if (!resp.ok) {
+    const text = (await resp.text().catch(() => '')).slice(0, 200);
+    const err = new Error('master export failed: HTTP ' + resp.status + ' ' + text);
+    err.httpStatus = 502;
+    throw err;
+  }
+  const exportData = await resp.json();
+  if (!exportData || exportData.status !== 'ok' || !exportData.ldif) {
+    const err = new Error('master export returned no directory');
+    err.httpStatus = 502;
+    throw err;
+  }
+
+  // 1. Adopt the resource catalog.
+  const imp = await importDirectory({ Resource, ResourceEdge, exportData });
+
+  // 2. Adopt the LDAP tree. The spoke keeps its own cn=admin / base DN;
+  //    ldapadd -c skips existing entries, so users/groups come from master.
+  let ldapNote = 'imported';
+  try {
+    const adminDn = conf.ldap && conf.ldap.bindDN;
+    // The admin credential for the local slapd (read from config at runtime —
+    // never hardcoded; named without the literal "password" keyword so secret
+    // scanners don't false-positive on a variable assignment).
+    const ldapCred = conf.ldap && conf.ldap.bindPassword;
+    const ldifFile = path.join(os.tmpdir(), 'theta-site-join.ldif');
+    fs.writeFileSync(ldifFile, exportData.ldif, 'utf8');
+    const argv = ldapAddArgs({ bindDN: adminDn, ldapCred, ldifFile, ldapUrl: conf.ldap && conf.ldap.url });
+    await execFileAsync(argv[0], argv.slice(1), { maxBuffer: 4 * 1024 * 1024, timeout: 120000 });
+    fs.unlink(ldifFile).catch(() => {});
+  } catch (e) {
+    ldapNote = 'skipped/failed: ' + e.message;
+  }
+
+  // 3. Adopt the master's agent-signing key, if it sent one (MULTI_SITE_SPEC.md
+  //    §2 -- identical directories). Best-effort: OpenBao being unreachable
+  //    here shouldn't fail a join/resync any more than it would on a
+  //    standalone install.
+  let signingKeyNote = 'not provided by master';
+  if (exportData.signingKey) {
+    try {
+      await agentKeys.adopt(exportData.signingKey);
+      signingKeyNote = 'adopted';
+    } catch (e) {
+      signingKeyNote = 'failed: ' + e.message;
+    }
+  }
+
+  return { imp, ldapNote, signingKeyNote, exportData, base };
+}
+
 router.post('/join', async (req, res, next) => {
   try {
-    const { masterUrl, joinKey } = req.body || {};
+    const { masterUrl, joinKey, selfUrl } = req.body || {};
     if (!masterUrl || !joinKey) {
       return res.status(400).json({ status: 'error', message: 'masterUrl and joinKey are required' });
     }
@@ -181,54 +372,52 @@ router.post('/join', async (req, res, next) => {
       });
     }
 
-    const base = String(masterUrl).replace(/\/+$/, '');
-    const controller = new AbortController();
-    const timer = setTimeout(() => controller.abort(), 30000);
-    let resp;
+    let adopted;
     try {
-      resp = await fetch(base + '/api/site/export', {
-        method: 'POST',
-        headers: { Authorization: 'Bearer ' + joinKey, 'Content-Type': 'application/json' },
-        body: '{}',
-        signal: controller.signal
-      });
-    } finally { clearTimeout(timer); }
-
-    if (!resp.ok) {
-      const text = (await resp.text().catch(() => '')).slice(0, 200);
-      return res.status(502).json({ status: 'error', message: 'master export failed: HTTP ' + resp.status + ' ' + text });
-    }
-    const exportData = await resp.json();
-    if (!exportData || exportData.status !== 'ok' || !exportData.ldif) {
-      return res.status(502).json({ status: 'error', message: 'master export returned no directory' });
-    }
-
-    // 1. Adopt the resource catalog.
-    const imp = await importDirectory({ Resource, ResourceEdge, exportData });
-
-    // 2. Adopt the LDAP tree. The spoke keeps its own cn=admin / base DN;
-    //    ldapadd -c skips existing entries, so users/groups come from master.
-    let ldapNote = 'imported';
-    try {
-      const adminDn = conf.ldap && conf.ldap.bindDN;
-      // The admin credential for the local slapd (read from config at runtime —
-      // never hardcoded; named without the literal "password" keyword so secret
-      // scanners don't false-positive on a variable assignment).
-      const ldapCred = conf.ldap && conf.ldap.bindPassword;
-      const ldifFile = path.join(os.tmpdir(), 'theta-site-join.ldif');
-      fs.writeFileSync(ldifFile, exportData.ldif, 'utf8');
-      const argv = ldapAddArgs({ bindDN: adminDn, ldapCred, ldifFile, ldapUrl: conf.ldap && conf.ldap.url });
-      await execFileAsync(argv[0], argv.slice(1), { maxBuffer: 4 * 1024 * 1024, timeout: 120000 });
-      fs.unlink(ldifFile).catch(() => {});
+      adopted = await adoptFromMaster({ masterUrl, joinKey });
     } catch (e) {
-      ldapNote = 'skipped/failed: ' + e.message;
+      return res.status(e.httpStatus || 502).json({ status: 'error', message: e.message });
+    }
+    const { imp, ldapNote, signingKeyNote, exportData, base } = adopted;
+
+    // 3. Register with the master for live replication, if this node knows
+    //    its own reachable endpoint (selfUrl -- see setup.env's
+    //    CFG_SELF_DIRECTORY_URL). Best-effort: a spoke that can't/won't
+    //    register still joins successfully, it just won't receive live
+    //    resync pushes (falls back to being exactly today's one-time
+    //    snapshot for that spoke, not a hard failure).
+    let replicationPushToken = null;
+    let replicationNote = 'not registered (no selfUrl given)';
+    if (selfUrl) {
+      try {
+        const regResp = await fetch(base + '/api/site/spokes', {
+          method: 'POST',
+          headers: { Authorization: 'Bearer ' + joinKey, 'Content-Type': 'application/json' },
+          body: JSON.stringify({ endpoint: selfUrl, siteSlug: exportData.siteSlug || cfg.siteSlug })
+        });
+        if (regResp.ok) {
+          const regBody = await regResp.json();
+          replicationPushToken = regBody.pushToken;
+          replicationNote = 'registered for live replication';
+        } else {
+          replicationNote = 'registration failed: HTTP ' + regResp.status;
+        }
+      } catch (e) {
+        replicationNote = 'registration failed: ' + e.message;
+      }
     }
 
-    // 3. Persist the spoke role (survives restarts). The join key is kept so
-    //    the spoke can run WAN-health checks (and, in a later layer, proxy
-    //    writes) against the master — it is a spoke-to-master credential, not
-    //    a shared secret.
-    siteConfig.save({ isMaster: false, masterUrl: base, siteSlug: exportData.siteSlug || cfg.siteSlug, masterJoinKey: joinKey });
+    // 4. Persist the spoke role (survives restarts). The join key is kept so
+    //    the spoke can run WAN-health checks against the master; the push
+    //    token (if registration succeeded) is what authenticates the
+    //    master's future resync pushes back to THIS node.
+    siteConfig.save({
+      isMaster: false,
+      masterUrl: base,
+      siteSlug: exportData.siteSlug || cfg.siteSlug,
+      masterJoinKey: joinKey,
+      ...(replicationPushToken ? { replicationPushToken } : {})
+    });
 
     logAudit('joined', {
       actor: req.user.uid,
@@ -237,7 +426,9 @@ router.post('/join', async (req, res, next) => {
       resourcesCreated: imp.created,
       resourcesUpdated: imp.updated,
       edges: imp.edgeCount,
-      ldap: ldapNote
+      ldap: ldapNote,
+      signingKey: signingKeyNote,
+      replication: replicationNote
     });
 
     res.json({
@@ -245,7 +436,9 @@ router.post('/join', async (req, res, next) => {
       message: 'Joined master site ' + base,
       siteSlug: exportData.siteSlug || cfg.siteSlug,
       resources: { created: imp.created, updated: imp.updated, edges: imp.edgeCount },
-      ldap: { note: ldapNote }
+      ldap: { note: ldapNote },
+      signingKey: { note: signingKeyNote },
+      replication: { note: replicationNote, live: !!replicationPushToken }
     });
   } catch (e) { next(e); }
 });
diff --git a/nodejs/tests/site_replicate.test.js b/nodejs/tests/site_replicate.test.js
new file mode 100644
index 0000000..d36d5fe
--- /dev/null
+++ b/nodejs/tests/site_replicate.test.js
@@ -0,0 +1,90 @@
+'use strict';
+
+// In-memory stand-in for the SiteSpoke ORM model.
+let spokeStore;
+function makeSpokeMock() {
+  spokeStore = [];
+  return {
+    list: jest.fn(async () => [...spokeStore]),
+    _seed(rows) { spokeStore.push(...rows); }
+  };
+}
+
+let mockFetchCalls = [];
+let mockFetchImpl = async () => ({ ok: true, status: 200 });
+
+describe('site_replicate', () => {
+  let siteReplicate;
+  let SiteSpoke;
+  let originalFetch;
+
+  beforeEach(() => {
+    jest.resetModules();
+    mockFetchCalls = [];
+    mockFetchImpl = async () => ({ ok: true, status: 200 });
+
+    jest.doMock('../models/site_spoke', () => ({ SiteSpoke: makeSpokeMock() }));
+    siteReplicate = require('../utils/site_replicate');
+    SiteSpoke = require('../models/site_spoke').SiteSpoke;
+
+    // site_replicate.js uses the global fetch (Node 18+ built-in), not
+    // node-fetch -- stub that directly.
+    originalFetch = global.fetch;
+    global.fetch = (...args) => { mockFetchCalls.push(args); return mockFetchImpl(...args); };
+  });
+
+  afterEach(() => {
+    global.fetch = originalFetch;
+  });
+
+  test('pushes to every known spoke concurrently with its own pushToken', async () => {
+    SiteSpoke._seed([
+      { endpoint: 'https://spoke-a.example.com', pushToken: 'token-a' },
+      { endpoint: 'https://spoke-b.example.com', pushToken: 'token-b' }
+    ]);
+
+    await siteReplicate.replicateToSpokes('catalog-changed');
+    await new Promise((r) => setImmediate(r));
+
+    expect(mockFetchCalls.length).toBe(2);
+    const urls = mockFetchCalls.map((c) => c[0]).sort();
+    expect(urls).toEqual(['https://spoke-a.example.com/api/site/resync', 'https://spoke-b.example.com/api/site/resync']);
+
+    const [, optsA] = mockFetchCalls.find((c) => c[0].includes('spoke-a'));
+    expect(optsA.headers.Authorization).toBe('Bearer token-a');
+    expect(JSON.parse(optsA.body).reason).toBe('catalog-changed');
+  });
+
+  test('no known spokes: resolves cleanly, no fetch calls', async () => {
+    await siteReplicate.replicateToSpokes('catalog-changed');
+    await new Promise((r) => setImmediate(r));
+    expect(mockFetchCalls.length).toBe(0);
+  });
+
+  test('one spoke failing does not prevent delivery to another', async () => {
+    SiteSpoke._seed([
+      { endpoint: 'https://dead-spoke.example.com', pushToken: 'token-dead' },
+      { endpoint: 'https://live-spoke.example.com', pushToken: 'token-live' }
+    ]);
+    mockFetchImpl = async (url) => {
+      if (url.includes('dead-spoke')) throw new Error('connection refused');
+      return { ok: true, status: 200 };
+    };
+
+    await expect(siteReplicate.replicateToSpokes('event')).resolves.toBeUndefined();
+    await new Promise((r) => setImmediate(r));
+    expect(mockFetchCalls.length).toBe(2);
+  });
+
+  test('a non-2xx response from a spoke does not throw out of replicateToSpokes', async () => {
+    SiteSpoke._seed([{ endpoint: 'https://spoke-a.example.com', pushToken: 'token-a' }]);
+    mockFetchImpl = async () => ({ ok: false, status: 500 });
+    await expect(siteReplicate.replicateToSpokes('event')).resolves.toBeUndefined();
+  });
+
+  test('SiteSpoke.list() throwing does not propagate to the caller', async () => {
+    SiteSpoke.list = jest.fn(async () => { throw new Error('db unavailable'); });
+    await expect(siteReplicate.replicateToSpokes('event')).resolves.toBeUndefined();
+    expect(mockFetchCalls.length).toBe(0);
+  });
+});
diff --git a/nodejs/utils/agent_keys.js b/nodejs/utils/agent_keys.js
index 3d91d93..80a9388 100644
--- a/nodejs/utils/agent_keys.js
+++ b/nodejs/utils/agent_keys.js
@@ -90,10 +90,34 @@ function status() {
 	return { available: !!cached, error: loadError };
 }
 
+// Overwrite the stored key with material handed over by a master (multi-site
+// "identical directories" — MULTI_SITE_SPEC.md §2). Every site sharing one
+// signing key is what lets any site's sso-manager validly sign a command for
+// an agent enrolled at any other site, at the accepted cost that compromising
+// ANY one site's OpenBao is equivalent to compromising all of them for agent
+// command authority. That tradeoff was deliberately accepted for this
+// deployment's scale (a handful of trusted sites) -- do not call this to sync
+// keys across a boundary where sites don't trust each other equally.
+//
+// Idempotent: adopting the same key material twice (e.g. on every resync
+// ping) is a no-op past the first call.
+async function adopt({ privateKeyPem, publicKeyPem }) {
+	if (!privateKeyPem || !publicKeyPem) throw new Error('adopt() requires both privateKeyPem and publicKeyPem');
+	if (cached && cached.privateKeyPem === privateKeyPem && cached.publicKeyPem === publicKeyPem) {
+		return cached; // already holding this exact key -- nothing to do
+	}
+	const material = { privateKeyPem, publicKeyPem };
+	await baoConf.set(PATH, material);
+	cached = { ...material, publicKeyBase64: rawPublicKeyBase64(publicKeyPem) };
+	loadError = null;
+	console.log('[agent_keys] adopted signing key from master (multi-site identical-directory sync)');
+	return cached;
+}
+
 // Test seam: drop the in-process cache.
 function _reset() {
 	cached = null;
 	loadError = null;
 }
 
-module.exports = { load, status, rawPublicKeyBase64, _reset, PATH };
+module.exports = { load, status, adopt, rawPublicKeyBase64, _reset, PATH };
diff --git a/nodejs/utils/site_replicate.js b/nodejs/utils/site_replicate.js
new file mode 100644
index 0000000..4421d65
--- /dev/null
+++ b/nodejs/utils/site_replicate.js
@@ -0,0 +1,57 @@
+'use strict';
+
+// Live replication push -- the piece the shipped v1 join flow doesn't have on
+// its own (join is a one-time export/import snapshot; nothing kept a spoke in
+// sync afterward). This fires a lightweight "something changed, re-pull" ping
+// at every spoke registered in SiteSpoke, concurrently, fire-and-forget: never
+// awaited by its caller, and one unreachable spoke never delays or blocks
+// another. See MULTI_SITE_SPEC.md §2.2 for why this must never become a
+// blocking design (a write must never stall on spoke reachability).
+//
+// Deliberately a PUSH-A-SIGNAL / PULL-A-SNAPSHOT design, not a push-a-diff
+// design: the receiving spoke reacts by calling the master's already-shipped,
+// already-tested POST /api/site/export + importDirectory() path again (see
+// routes/api_site.js's /resync handler), rather than this module inventing a
+// second, parallel way to represent "what changed." Fewer moving parts, and
+// no risk of a diff payload and a full export ever disagreeing.
+
+const { SiteSpoke } = require('../models/site_spoke');
+
+const RESYNC_TIMEOUT_MS = 8000;
+
+function replicateToSpokes(reason) {
+	return (async () => {
+		let spokes;
+		try {
+			spokes = await SiteSpoke.list();
+		} catch (err) {
+			console.error('[site-replicate] failed to list known spokes:', err.message);
+			return;
+		}
+		for (const spoke of spokes) {
+			// Not awaited -- every spoke is pushed to concurrently.
+			pingOne(spoke, reason).catch((err) => {
+				console.error(`[site-replicate] resync ping to ${spoke.endpoint} failed:`, err.message);
+			});
+		}
+	})();
+}
+
+async function pingOne(spoke, reason) {
+	const url = String(spoke.endpoint).replace(/\/+$/, '') + '/api/site/resync';
+	const controller = new AbortController();
+	const timer = setTimeout(() => controller.abort(), RESYNC_TIMEOUT_MS);
+	try {
+		const resp = await fetch(url, {
+			method: 'POST',
+			headers: { Authorization: 'Bearer ' + spoke.pushToken, 'Content-Type': 'application/json' },
+			body: JSON.stringify({ reason: reason || 'catalog-changed' }),
+			signal: controller.signal
+		});
+		if (!resp.ok) throw new Error('status ' + resp.status);
+	} finally {
+		clearTimeout(timer);
+	}
+}
+
+module.exports = { replicateToSpokes };
diff --git a/nodejs/views/directory.ejs b/nodejs/views/directory.ejs
index d5e9cf7..8769962 100644
--- a/nodejs/views/directory.ejs
+++ b/nodejs/views/directory.ejs
@@ -3339,6 +3339,10 @@
               '<tr><th>WAN Sync Health:</th><td>' + (res.config.wanConnected === false
                 ? '<span class="badge bg-danger"><i class="fa-solid fa-xmark me-1"></i> Offline / Disconnected</span>'
                 : '<span class="badge bg-success"><i class="fa-solid fa-check me-1"></i> Online / Operational</span>') + '</td></tr>' +
+              (!isMaster ? '<tr><th>Live Replication:</th><td>' + (cfg.liveReplication
+                ? '<span class="badge bg-success"><i class="fa-solid fa-bolt me-1"></i> Live (catalog updates push automatically)</span>'
+                : '<span class="badge bg-warning text-dark"><i class="fa-solid fa-triangle-exclamation me-1"></i> Snapshot only (re-join to register for live updates)</span>') + '</td></tr>' : '') +
+              (isMaster ? '<tr><th>Registered Spokes:</th><td><span class="badge bg-success">' + (cfg.registeredSpokesCount || 0) + ' receiving live updates</span></td></tr>' : '') +
               '<tr><th>Registered Sites:</th><td><span class="badge bg-primary">' + (res.sitesCount || 0) + ' sites</span></td></tr>' +
               '<tr><th>Theta Gateways:</th><td><span class="badge bg-dark">' + (res.gatewaysCount || 0) + ' active gateways</span></td></tr>' +
             '</table>' +
@@ -3359,6 +3363,10 @@
               '<div class="col-md-7"><input type="text" id="site-join-url" class="form-control form-control-sm" placeholder="Master Directory URL (e.g. https://sso.master.example.com)"></div>' +
               '<div class="col-md-5"><input type="text" id="site-join-key" class="form-control form-control-sm font-monospace" placeholder="Site join key (stj_...)"></div>' +
             '</div>' +
+            '<div class="mt-2">' +
+              '<label class="form-label small mb-1">This site\'s own reachable URL <span class="text-muted">(so the master can push live updates here — leave blank to only get a one-time snapshot)</span></label>' +
+              '<input type="text" id="site-join-self-url" class="form-control form-control-sm" value="' + esc(window.location.origin) + '">' +
+            '</div>' +
             '<button class="btn btn-sm btn-primary mt-2" onclick="joinCurrentSiteToMaster()"><i class="fa-solid fa-link me-1"></i> Join Site</button>' +
           '</div>' +
         '</div>';
@@ -3408,8 +3416,9 @@
     if (!confirmed) return;
 
     try {
-      const res = await app.api.post('directory-admin/site-promote', {});
-      app.messages.toast(res.message || 'Node promoted to Master Site', 'success');
+      const res = await app.api.post('directory-admin/site-promote', { selfUrl: window.location.origin });
+      const handoffOk = res.handoff === 'previous master demoted' || /no previous master/.test(res.handoff || '');
+      app.messages.toast((res.message || 'Node promoted to Master Site') + ' — ' + (res.handoff || ''), handoffOk ? 'success' : 'warning');
       app.modal.close();
       refreshSiteStatus();
     } catch (e) {
@@ -3421,6 +3430,7 @@
   async function joinCurrentSiteToMaster() {
     const masterUrl = ($('#site-join-url').val() || '').trim();
     const joinKey = ($('#site-join-key').val() || '').trim();
+    const selfUrl = ($('#site-join-self-url').val() || '').trim();
     if (!masterUrl || !joinKey) {
       return app.messages.toast('Enter the master Directory URL and a site join key', 'warning');
     }
@@ -3431,8 +3441,11 @@
     if (!confirmed) return;
 
     try {
-      const res = await app.api.post('site/join', { masterUrl, joinKey });
-      app.messages.toast(res.message || 'Joined master site', 'success');
+      const res = await app.api.post('site/join', { masterUrl, joinKey, ...(selfUrl ? { selfUrl } : {}) });
+      const replicationNote = res.replication && res.replication.live
+        ? ' Live replication is active.'
+        : ' Snapshot only — this site will not receive live updates (' + ((res.replication && res.replication.note) || 'no selfUrl given') + ').';
+      app.messages.toast((res.message || 'Joined master site') + replicationNote, res.replication && res.replication.live ? 'success' : 'warning');
       app.modal.close();
       refreshSiteStatus();
     } catch (e) {
diff --git a/test/multisite_join_e2e.js b/test/multisite_join_e2e.js
new file mode 100644
index 0000000..c3c0a43
--- /dev/null
+++ b/test/multisite_join_e2e.js
@@ -0,0 +1,297 @@
+'use strict';
+
+// End-to-end test of the real, shipped multi-site join flow (docs/site-join.md).
+// Drives the actual HTTP API two humans (a master admin + a spoke admin)
+// would use: seed an admin on each side, mint a site join key on master,
+// have the spoke adopt it, and verify the post-join contract holds.
+
+const { execFileSync } = require('child_process');
+const crypto = require('crypto');
+
+// Wrapper matching the async call sites below (execFileSync throws
+// synchronously; wrap in a resolved/rejected promise so callers can keep
+// using await/.catch()). NOTE: plain execFile (async) does NOT support the
+// `input` option for piping stdin -- only the *Sync variants do -- so
+// ldapadd/ldapmodify would otherwise hang forever waiting on stdin that never
+// arrives. This bit us once already; don't switch back to async execFile here
+// without adding real stdin piping.
+function execFileAsync(cmd, args, opts) {
+  try {
+    const stdout = execFileSync(cmd, args, { ...opts, stdio: ['pipe', 'pipe', 'pipe'] });
+    return Promise.resolve({ stdout: stdout ? stdout.toString() : '' });
+  } catch (e) {
+    e.stderr = e.stderr ? e.stderr.toString() : '';
+    return Promise.reject(e);
+  }
+}
+
+const MASTER_URL = process.env.MASTER_URL || 'http://master:3001';
+const SPOKE_URL = process.env.SPOKE_URL || 'http://spoke:3001';
+const MASTER_LDAP_HOST = process.env.MASTER_LDAP_HOST || 'master';
+const MASTER_BASE_DN = process.env.MASTER_BASE_DN || 'dc=master,dc=test';
+const SPOKE_LDAP_HOST = process.env.SPOKE_LDAP_HOST || 'spoke';
+const SPOKE_BASE_DN = process.env.SPOKE_BASE_DN || 'dc=spoke,dc=test';
+const LDAP_ADMIN_PASS = process.env.LDAP_ADMIN_PASS || 'secret';
+const ADMIN_UID = 'e2eadmin';
+const ADMIN_PASSWORD = 'MultiSiteE2E!2';
+
+let failed = false;
+function fail(msg) {
+  console.error('MULTISITE E2E FAIL:', msg);
+  failed = true;
+}
+function step(msg) {
+  console.log('--- ' + msg);
+}
+
+async function waitForHealthy(url, label) {
+  for (let i = 0; i < 60; i++) {
+    try {
+      const r = await fetch(`${url}/health`);
+      if (r.ok) return;
+    } catch (_) { /* not up yet */ }
+    await new Promise((res) => setTimeout(res, 1000));
+  }
+  throw new Error(`${label} never became healthy`);
+}
+
+// Seed an admin user directly via ldapadd/ldapmodify -- mirrors
+// test/seed-test-user.sh, but parameterized per-site since master and spoke
+// have distinct base DNs in this harness.
+async function seedAdmin(ldapHost, baseDn) {
+  const salt = crypto.randomBytes(8);
+  const digest = crypto.createHash('sha512').update(ADMIN_PASSWORD).update(salt).digest();
+  const hash = '{SSHA512}' + Buffer.concat([digest, salt]).toString('base64');
+
+  const ldif = `
+dn: cn=${ADMIN_UID},ou=groups,${baseDn}
+objectClass: posixGroup
+objectClass: top
+cn: ${ADMIN_UID}
+gidNumber: 1600
+
+dn: cn=${ADMIN_UID},ou=people,${baseDn}
+objectClass: inetOrgPerson
+objectClass: posixAccount
+objectClass: top
+objectClass: theta42Person
+objectClass: ldapPublicKey
+objectClass: sudoRole
+cn: ${ADMIN_UID}
+sn: E2E
+uid: ${ADMIN_UID}
+uidNumber: 1600
+gidNumber: 1600
+homeDirectory: /home/${ADMIN_UID}
+loginShell: /bin/bash
+mail: ${ADMIN_UID}@test.local
+userPassword: ${hash}
+`.trim() + '\n';
+
+  const bindDn = `cn=admin,${baseDn}`;
+  await execFileAsync('ldapadd', ['-x', '-H', `ldap://${ldapHost}:389`, '-D', bindDn, '-w', LDAP_ADMIN_PASS], { input: ldif })
+    .catch((e) => { if (!/Already exists/.test(e.stderr || '')) throw e; });
+
+  // god_admin is needed for site-promote (SUPER_ADMIN_GROUP, utils/permission.js).
+  for (const group of ['app_sso_admin', 'god_admin']) {
+    const modLdif = `dn: cn=${group},ou=groups,${baseDn}\nchangetype: modify\nadd: member\nmember: cn=${ADMIN_UID},ou=people,${baseDn}\n`;
+    try {
+      await execFileAsync('ldapmodify', ['-x', '-H', `ldap://${ldapHost}:389`, '-D', bindDn, '-w', LDAP_ADMIN_PASS], { input: modLdif });
+      console.log(`    (added ${ADMIN_UID} to ${group} on ${ldapHost})`);
+    } catch (e) {
+      if (!/[Tt]ype or value exists/.test(e.stderr || '')) {
+        console.error(`    FAILED adding ${ADMIN_UID} to ${group} on ${ldapHost}: ${e.stderr || e.message}`);
+        throw e;
+      }
+      console.log(`    (${ADMIN_UID} already in ${group} on ${ldapHost})`);
+    }
+  }
+
+  const verify = await execFileAsync('ldapsearch', ['-x', '-H', `ldap://${ldapHost}:389`, '-D', bindDn, '-w', LDAP_ADMIN_PASS,
+    '-b', `cn=god_admin,ou=groups,${baseDn}`, 'member']);
+  console.log(`    god_admin members on ${ldapHost}:\n${verify.stdout}`);
+}
+
+async function login(url) {
+  const r = await fetch(`${url}/api/auth/login`, {
+    method: 'POST',
+    headers: { 'Content-Type': 'application/json' },
+    body: JSON.stringify({ uid: ADMIN_UID, password: ADMIN_PASSWORD })
+  });
+  if (!r.ok) throw new Error(`login at ${url} failed: ${r.status} ${await r.text()}`);
+  const body = await r.json();
+  return body.token;
+}
+
+async function api(url, path, { method = 'GET', token, body } = {}) {
+  const r = await fetch(`${url}${path}`, {
+    method,
+    headers: {
+      'Content-Type': 'application/json',
+      ...(token ? { 'auth-token': token } : {})
+    },
+    body: body ? JSON.stringify(body) : undefined
+  });
+  const text = await r.text();
+  let json;
+  try { json = JSON.parse(text); } catch (_) { json = { raw: text }; }
+  return { status: r.status, body: json };
+}
+
+async function main() {
+  step('Waiting for master + spoke to be healthy');
+  await waitForHealthy(MASTER_URL, 'master');
+  await waitForHealthy(SPOKE_URL, 'spoke');
+
+  step('Seeding admin users in both sites\' LDAP');
+  await seedAdmin(MASTER_LDAP_HOST, MASTER_BASE_DN);
+  await seedAdmin(SPOKE_LDAP_HOST, SPOKE_BASE_DN);
+
+  step('Logging in as admin on master and spoke');
+  const masterToken = await login(MASTER_URL);
+  const spokeToken = await login(SPOKE_URL);
+  if (!masterToken) fail('no token from master login');
+  if (!spokeToken) fail('no token from spoke login');
+
+  step('Confirming both sites start as master (fresh installs)');
+  {
+    const { body } = await api(MASTER_URL, '/api/site/config', { token: masterToken });
+    if (body.config.isMaster !== true) fail(`expected master to start isMaster:true, got ${JSON.stringify(body.config)}`);
+  }
+  {
+    const { body } = await api(SPOKE_URL, '/api/site/config', { token: spokeToken });
+    if (body.config.isMaster !== true) fail(`expected spoke to start isMaster:true (pre-join), got ${JSON.stringify(body.config)}`);
+  }
+
+  step('Creating a resource on master BEFORE join, to verify it gets adopted');
+  // Only site resources can be top-level; a host needs a parent site.
+  const siteRes = await api(MASTER_URL, '/api/directory-admin/resources', {
+    method: 'POST',
+    token: masterToken,
+    body: { name: 'E2E Site', slug: 'site_e2e', kind: 'site' }
+  });
+  if (siteRes.status !== 200) fail(`seeding pre-join site on master failed: ${siteRes.status} ${JSON.stringify(siteRes.body)}`);
+
+  const seedRes = await api(MASTER_URL, '/api/directory-admin/resources', {
+    method: 'POST',
+    token: masterToken,
+    body: { name: 'E2E Pre-Join Host', slug: 'host_e2e_prejoin', kind: 'host', parentSlug: 'site_e2e' }
+  });
+  if (seedRes.status !== 200) fail(`seeding pre-join resource on master failed: ${seedRes.status} ${JSON.stringify(seedRes.body)}`);
+
+  step('Minting a site join key on master');
+  const keyRes = await api(MASTER_URL, '/api/site/join-keys', {
+    method: 'POST',
+    token: masterToken,
+    body: { label: 'e2e-test' }
+  });
+  if (keyRes.status !== 200 || !keyRes.body.key) fail(`join-key mint failed: ${keyRes.status} ${JSON.stringify(keyRes.body)}`);
+  const joinKey = keyRes.body.key;
+
+  step('Joining spoke to master (with selfUrl, to register for live replication)');
+  const joinRes = await api(SPOKE_URL, '/api/site/join', {
+    method: 'POST',
+    token: spokeToken,
+    // master's own container-internal URL, as the spoke would reach it over the network
+    body: { masterUrl: 'http://master:3001', joinKey, selfUrl: 'http://spoke:3001' }
+  });
+  if (joinRes.status !== 200) fail(`join failed: ${joinRes.status} ${JSON.stringify(joinRes.body)}`);
+  if (!joinRes.body.replication || joinRes.body.replication.live !== true) {
+    fail(`expected join to register for live replication, got ${JSON.stringify(joinRes.body.replication)}`);
+  }
+
+  step('Verifying spoke persisted isMaster:false + masterUrl after join');
+  const { body: spokeCfg } = await api(SPOKE_URL, '/api/site/config', { token: spokeToken });
+  if (spokeCfg.config.isMaster !== false) fail(`spoke should be isMaster:false after join, got ${JSON.stringify(spokeCfg.config)}`);
+  if (!spokeCfg.config.masterUrl) fail('spoke should have masterUrl set after join');
+
+  step('Verifying the spoke adopted the master\'s pre-join catalog');
+  const spokeResources = await api(SPOKE_URL, '/api/directory-admin/resources', { token: spokeToken });
+  const adopted = (spokeResources.body.results || spokeResources.body.resources || spokeResources.body || []);
+  const found = Array.isArray(adopted) && adopted.some(r => r.slug === 'host_e2e_prejoin');
+  if (!found) fail(`spoke did not adopt master's pre-join resource; got slugs=${JSON.stringify((adopted || []).map(r => r.slug))}`);
+
+  step('Verifying spoke is now read-only (write attempt must 403)');
+  const writeAttempt = await api(SPOKE_URL, '/api/directory-admin/resources', {
+    method: 'POST',
+    token: spokeToken,
+    body: { name: 'Should Be Rejected', slug: 'host_e2e_should_reject', kind: 'host' }
+  });
+  if (writeAttempt.status !== 403) fail(`expected 403 writing to spoke post-join, got ${writeAttempt.status} ${JSON.stringify(writeAttempt.body)}`);
+
+  step('Creating a resource on master AFTER join, to verify LIVE replication (not just the one-time join snapshot)');
+  const postJoinRes = await api(MASTER_URL, '/api/directory-admin/resources', {
+    method: 'POST',
+    token: masterToken,
+    body: { name: 'E2E Post-Join Host', slug: 'host_e2e_postjoin', kind: 'host', parentSlug: 'site_e2e' }
+  });
+  if (postJoinRes.status !== 200) fail(`creating post-join resource on master failed: ${postJoinRes.status} ${JSON.stringify(postJoinRes.body)}`);
+
+  step('Waiting for the fire-and-forget resync push to reach the spoke');
+  let liveReplicated = false;
+  for (let i = 0; i < 20; i++) {
+    const r = await api(SPOKE_URL, '/api/directory-admin/resources', { token: spokeToken });
+    const slugs = (r.body.results || r.body.resources || r.body || []).map((x) => x.slug);
+    if (slugs.includes('host_e2e_postjoin')) { liveReplicated = true; break; }
+    await new Promise((res) => setTimeout(res, 500));
+  }
+  if (!liveReplicated) fail('post-join resource never appeared on the spoke -- live replication did not fire (or resync did not apply it)');
+
+  step('Verifying WAN health ping from spoke to master succeeds');
+  const statusRes = await api(SPOKE_URL, '/api/directory-admin/site-status', { token: spokeToken });
+  if (statusRes.body.config && statusRes.body.config.wanConnected !== true) {
+    fail(`expected spoke to report wanConnected:true post-join, got ${JSON.stringify(statusRes.body.config)}`);
+  }
+
+  step('Verifying master itself is unaffected (still isMaster:true, no writes blocked)');
+  const { body: masterCfg } = await api(MASTER_URL, '/api/site/config', { token: masterToken });
+  if (masterCfg.config.isMaster !== true) fail('master flipped away from isMaster:true unexpectedly');
+
+  step('Promoting the spoke to master (coordinated handoff -- must demote the old master too)');
+  const promoteRes = await api(SPOKE_URL, '/api/directory-admin/site-promote', {
+    method: 'POST',
+    token: spokeToken,
+    body: { selfUrl: 'http://spoke:3001' }
+  });
+  if (promoteRes.status !== 200) fail(`promotion failed: ${promoteRes.status} ${JSON.stringify(promoteRes.body)}`);
+  if (promoteRes.body.handoff !== 'previous master demoted') {
+    fail(`expected the old master to be demoted as part of promotion, got handoff=${JSON.stringify(promoteRes.body.handoff)}`);
+  }
+
+  step('Verifying the newly-promoted node is master');
+  const { body: newMasterCfg } = await api(SPOKE_URL, '/api/site/config', { token: spokeToken });
+  if (newMasterCfg.config.isMaster !== true) fail(`newly-promoted node should be isMaster:true, got ${JSON.stringify(newMasterCfg.config)}`);
+
+  step('Verifying the old master was actually demoted to a spoke of the new master');
+  const { body: oldMasterCfg } = await api(MASTER_URL, '/api/site/config', { token: masterToken });
+  if (oldMasterCfg.config.isMaster !== false) fail(`old master should be isMaster:false after being demoted, got ${JSON.stringify(oldMasterCfg.config)}`);
+  if (oldMasterCfg.config.masterUrl !== 'http://spoke:3001') {
+    fail(`old master's masterUrl should now point at the new master, got ${JSON.stringify(oldMasterCfg.config.masterUrl)}`);
+  }
+
+  step('Verifying the (now-demoted) old master rejects writes, and the new master accepts them');
+  const oldMasterWrite = await api(MASTER_URL, '/api/directory-admin/resources', {
+    method: 'POST',
+    token: masterToken,
+    body: { name: 'Should Be Rejected Post-Demotion', slug: 'host_e2e_should_reject_2', kind: 'host' }
+  });
+  if (oldMasterWrite.status !== 403) fail(`expected 403 writing to the demoted old master, got ${oldMasterWrite.status} ${JSON.stringify(oldMasterWrite.body)}`);
+
+  const newMasterWrite = await api(SPOKE_URL, '/api/directory-admin/resources', {
+    method: 'POST',
+    token: spokeToken,
+    body: { name: 'E2E Post-Promotion Host', slug: 'host_e2e_postpromotion', kind: 'host', parentSlug: 'site_e2e' }
+  });
+  if (newMasterWrite.status !== 200) fail(`expected the newly-promoted master to accept writes, got ${newMasterWrite.status} ${JSON.stringify(newMasterWrite.body)}`);
+
+  if (failed) {
+    console.error('MULTISITE E2E: one or more checks failed (see above)');
+    process.exit(1);
+  }
+  console.log('MULTISITE E2E PASS');
+}
+
+main().catch((e) => {
+  console.error('MULTISITE E2E FAIL (exception):', e.stack || e.message);
+  process.exit(1);
+});