fix: harden identity, live access, drafts and setup (review only)

Source-reviewed hardening changes and regression tests. UNBUILT / UNTESTED: not a deployable release. Go formatting, compilation, automated regression tests, full frontend validation and staging acceptance remain required. See docs/hardening/VALIDATION.md. Main remains the original clean snapshot; no upstream Git history imported.

web/lib/realtime-connection.test.mjs

@@ -1,3 +1,4 @@
+// Modified in the independent hardening fork; see docs/hardening/README.md.
 import assert from "node:assert/strict"
 import test from "node:test"
 
@@ -97,3 +98,41 @@ test("beforeConnect failure triggers onConnectError and disconnect status", asyn
   assert.ok(statusList.includes("disconnected"), "status should include disconnected")
   manager.disconnect()
 })
+
+test("disconnect invalidates a pending beforeConnect even across reconnect", async () => {
+  let resolveOld
+  let attempts = 0, created = 0
+  const old = new Promise((resolve) => { resolveOld = resolve })
+  const manager = createRealtimeConnectionManager({
+    beforeConnect: () => ++attempts === 1 ? old : Promise.resolve(),
+    createSocket: () => { created++; return new MockWebSocket() },
+  })
+  const first = manager.connect()
+  manager.disconnect()
+  await manager.connect()
+  resolveOld()
+  await first
+  assert.equal(created, 1)
+  manager.disconnect()
+})
+
+test("late old socket close cannot clear current connection or notify current owner", async () => {
+  let closed = 0
+  const sockets = []
+  const manager = createRealtimeConnectionManager({
+    createSocket: () => {
+      const socket = new MockWebSocket()
+      // Simulate an asynchronously arriving close event after replacement.
+      socket.close = () => { socket.readyState = MockWebSocket.CLOSED }
+      sockets.push(socket)
+      return socket
+    },
+    onClose: () => { closed++ },
+  })
+  await manager.connect()
+  await manager.connect()
+  sockets[0].emit("close", {})
+  assert.equal(manager.getSocket(), sockets[1])
+  assert.equal(closed, 0)
+  manager.disconnect()
+})