Restart contact streams after storage recovery

Release cached path snapshots before resetting contacts while retaining the requesting transport and table revision for a complete stream restart. Keep explicit session cancellation unchanged and avoid copying uncached contact buffers.

Cover cached and uncached recovery, transport isolation, empty reloads, backpressure, and the former cancellation as a negative control.

examples/companion_radio/MyMesh.cpp

@@ -7526,7 +7526,12 @@ void MyMesh::onContactCacheFlushed() {
 }
 
 bool MyMesh::resetContactsForRecovery() {
-  stopContactsIterator();
+  // Release retained paths before resetting the table. Keep the stream owner
+  // so its changed table revision restarts a complete list on the next pass.
+#if MESH_CONTACT_CACHE
+  _iter_pending_contact = ContactInfo();
+#endif
+  _iter_contact_pending = false;
   resetContacts();
   MyMesh::onContactCacheFlushed();
   return true;