feat: a group can be left out of Search, and Search tries every node

`search_listed` is a per-group setting on the node, changed by a signed
operator op and carried in the sealed handshake ack. Search reads it after
the handshake and stops there: no index is fetched, cached or merged, in any
of the four views, and the page says how many groups it left out. The switch
is a "Search" section in the group's settings, shown to the operator.

Absent means listed, at every layer: roster default, ack default, and the
client only drops a group on an explicit `false` — so an upgrade or an older
node removes nothing from anyone's Search.

It is a listing preference and protects nothing: the node serves the same
index to Search and to the group page and cannot tell them apart, every
member lists the group by opening it, and a client that ignores the flag
lists it in Search too. Design §9.11 says so, so it is never described as
private. The cost is one handshake per unlisted group, because only the node
knows the setting.

Search also took `nodes[0]` twice — for the index and for the pooled
connection — the defect 4cce50f fixed on the group page only. One
`connectToGroup` now walks the list the same way: a refusal about this
browser stops, `not_hosted` or a failed connection moves on.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XuNrwLf5EFWCMHzfoEvnpm

1 files changed, 24 insertions, 2 deletions

diff --git a/packages/meshbay-hub/src/meshbay_hub/static/transport.js b/packages/meshbay-hub/src/meshbay_hub/static/transport.js
index 9de5407..1f05b8d 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/transport.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/transport.js
@@ -96,7 +96,7 @@ const BROADCAST_ACK_TYPES = new Set([
   'root_update_ack', 'root_eject_ack', 'root_plug_ack',
   'root_add_ack', 'root_remove_ack',
   'app_directories_ack', 'chat_directory_ack', 'chat_link_preview_ack',
-  'chat_epoch_ack',
+  'chat_epoch_ack', 'search_listed_ack',
 ]);
 
 /** Hand a broadcast ack to the callback that would have had it from a peer. */
@@ -107,6 +107,8 @@ function _replayBroadcast(transport, msg) {
     transport._onChatDirectory(msg.path || '');
   } else if (msg.type === 'chat_link_preview_ack' && transport._onChatLinkPreview) {
     transport._onChatLinkPreview(Boolean(msg.enabled));
+  } else if (msg.type === 'search_listed_ack' && transport._onSearchListed) {
+    transport._onSearchListed(msg.listed !== false);
   } else if (msg.type === 'chat_epoch_ack') {
     transport._applyChatEpoch(msg);
   } else if (transport._onRootsChanged) {
@@ -120,7 +122,7 @@ const ADMIN_OP_TYPES = new Set([
   'apps_enabled', 'set_scan_settings', 'member_revoke',
   'root_add', 'root_remove', 'root_update', 'root_eject', 'root_plug',
   'app_directories', 'chat_directory', 'chat_link_preview', 'chat_epoch',
-  'member_unpin', 'gek_rotate', 'group_attach',
+  'search_listed', 'member_unpin', 'gek_rotate', 'group_attach',
   'group_detach', 'invite_create',
 ]);
 
@@ -533,6 +535,7 @@ class MeshBayTransport {
   set onAppDirectories(fn) { this._onAppDirectories = fn; }
   set onChatDirectory(fn) { this._onChatDirectory = fn; }
   set onChatLinkPreview(fn) { this._onChatLinkPreview = fn; }
+  set onSearchListed(fn) { this._onSearchListed = fn; }
   set onChatEpoch(fn) { this._onChatEpoch = fn; }
   set onTmdbConfig(fn) { this._onTmdbConfig = fn; }
   set onTmdbEnabled(fn) { this._onTmdbEnabled = fn; }
@@ -1526,6 +1529,22 @@ class MeshBayTransport {
   }
 
   /**
+   * Whether this group's files appear in members' cross-group Search.
+   * Presentation only — opening the group lists everything regardless.
+   */
+  async setSearchListed(listed, signFn) {
+    const msg = await this._sendAndWait({
+      type: 'search_listed', v: '3.0', listed: Boolean(listed),
+    });
+    if (msg.type === 'error') throw new Error(msg.detail);
+    if (msg.type === 'admin_challenge') {
+      return this._authorizeAdminOp(
+        msg, 'search_listed', listed ? 'on' : 'off', signFn);
+    }
+    return msg;
+  }
+
+  /**
    * Open a new chat epoch by hand. Operator only, and signed.
    *
    * Not a switch — there is nothing to turn on. The removals that matter open
@@ -3097,6 +3116,9 @@ class MeshBayTransport {
     if (msg.type === 'chat_link_preview_ack' && this._onChatLinkPreview) {
       this._onChatLinkPreview(Boolean(msg.enabled));
     }
+    if (msg.type === 'search_listed_ack' && this._onSearchListed) {
+      this._onSearchListed(msg.listed !== false);
+    }
     if (msg.type === 'chat_epoch_ack') {
       this._applyChatEpoch(msg);
       return;