fix(mesh): enforce LoRa-only off-grid labels

core/archipelago/src/mesh/mod.rs

@@ -1116,7 +1116,14 @@ impl MeshService {
                 .map(|p| !p.reachable && p.arch_pubkey_hex.is_some())
                 .unwrap_or(false)
         };
-        if is_federation_synthetic || exceeds_lora || radio_federated_unreachable {
+        let mesh_only_mode = load_config(&self.data_dir)
+            .await
+            .ok()
+            .and_then(|cfg| cfg.mesh_only_mode)
+            .unwrap_or(false);
+        if !mesh_only_mode
+            && (is_federation_synthetic || exceeds_lora || radio_federated_unreachable)
+        {
             // Resolve the peer's pubkey/did. Prefer the live mesh peer table,
             // but fall back to federation storage for federation-synthetic ids
             // that were never seeded into `state.peers` — e.g. a radio-less
@@ -1185,6 +1192,17 @@ impl MeshService {
             // (`send_dm_via_channel` in listener/session.rs) handles both
             // single-frame and chunked transmission internally; we must NOT
             // pre-chunk here as well or the receiver sees garbage.
+        } else if mesh_only_mode
+            && (is_federation_synthetic || exceeds_lora || radio_federated_unreachable)
+        {
+            tracing::info!(
+                contact_id,
+                bytes = wire.len(),
+                is_federation_synthetic,
+                exceeds_lora,
+                radio_federated_unreachable,
+                "Off-grid mode active; forcing mesh message over LoRa only"
+            );
         }
         self.send_raw_payload(contact_id, wire).await?;
         Ok(self