BREAKING EXPERIMENTAL: Holepunch-native hard migration (RPC core, shared storage, SDK v2)

BREAKING: All nodes must upgrade together. Legacy p2ns.core-request string
messages are rejected; invite/consensus control plane uses protomux-rpc
(invite.request, invite.ack, invite.relay*, consensus.*). Shared Corestore
namespaces are the default for plugin DBs and drives; USE_SHARED_CORESTORE_NAMESPACES=false
is debug-only. Admin plugin actions with params are validated before run.

EXPERIMENTAL: End-to-end RPC invite path reuses existing handlers via adapters;
invite wire still ships on the invite channel. Multi-peer invite/relay
integration tests are not in CI yet (core-rpc-smoke only).

SDK & channels:
- channel-rpc.js, sdk.channels.rpc (register/request/event)
- core-rpc.js for p2ns.core; action-params + plugin route validation
- sdk.db.getCore/reopen, sdk.state.getPeerChannelSnapshot,
  sdk.metrics.getHolepunchStats (schema v1)

Runtime:
- p2ns.js: RPC-first core invite/consensus; Hyperswarm firewall/reconnect
- channel-manager: required protomux-rpc per peer
- db-shared-namespace-migration; drive-manager shared namespaces
- proxy-server: invite.request RPC for joiners

Plugins: file.drop, global.profile, peer.directory, domain.consensus,
peer.visualize, example.plugin (RPC demo); peer.directory UI polish

Also: CI/smoke scripts, diagnostics hardening, plugin config schema validation,
admin action param modal, docs/RFCS, package-lock + engines.node >= 18

test-scripts/admin-smoke.js

@@ -0,0 +1,44 @@
+#!/usr/bin/env node
+/*
+ * p2ns.admin smoke validation script
+ * Usage:
+ *   node test-scripts/admin-smoke.js https://p2ns.admin
+ */
+
+const target = process.argv[2] || 'https://p2ns.admin';
+
+async function fetchJson(path) {
+  const response = await fetch(`${target}${path}`);
+  if (!response.ok) {
+    throw new Error(`${path} failed with status ${response.status}`);
+  }
+  return response.json();
+}
+
+async function run() {
+  if (process.env.SKIP_SMOKE_TESTS === '1') {
+    console.log('p2ns.admin smoke checks skipped (SKIP_SMOKE_TESTS=1)');
+    return;
+  }
+
+  const health = await fetchJson('/api/health');
+  const status = await fetchJson('/api/status');
+  const stats = await fetchJson('/api/stats');
+
+  if (!health || typeof health !== 'object') {
+    throw new Error('Health endpoint returned invalid payload');
+  }
+  if (!status || typeof status.connectedPeers !== 'number') {
+    throw new Error('Status endpoint missing connectedPeers');
+  }
+  if (!stats || typeof stats.totalRequests !== 'number') {
+    throw new Error('Stats endpoint missing totalRequests');
+  }
+
+  console.log('p2ns.admin smoke checks passed');
+}
+
+run().catch((err) => {
+  console.error(`p2ns.admin smoke checks failed: ${err.message}`);
+  process.exit(1);
+});