fix(mesh): route ContentRef over federation when >160B

mesh.send-content was failing with "Message too large for LoRa: 624
bytes (max 160)" because a single ContentRef envelope (cid + onion +
cap_token + thumb) dwarfs a LoRa frame. Add a federation Tor fallback:

- New POST /archipelago/mesh-typed endpoint accepts
  {from_pubkey, typed_envelope_b64, signature}, verifies ed25519 over
  the raw wire bytes, and injects the decoded envelope into MeshState
  via a new MeshService::inject_typed_from_federation helper. This
  shares the same dispatch match as LoRa receives via a new pub(crate)
  handle_typed_envelope_direct extracted from handle_typed_message.
- MeshService::send_typed_wire_via_federation POSTs the signed wire to
  a peer's onion over TOR_SOCKS_PROXY and records a local Sent record.
- handle_mesh_send_content looks up the peer's onion in federation
  storage and routes via federation when available, falling back to
  LoRa only when no federation presence is known (still fails on
  oversized — chunking is Phase 4).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

core/archipelago/src/api/handler/mod.rs

@@ -267,6 +267,15 @@ impl ApiHandler {
                 Self::handle_node_message(body_bytes).await
             }
 
+            // Mesh typed envelope relay over federation — peers POST
+            // pre-encoded TypedEnvelope wire bytes here when the envelope is
+            // too large for a single LoRa frame (primarily ContentRef). No
+            // session auth: the body carries a pubkey + ed25519 signature
+            // over the wire bytes which we verify before dispatching.
+            (Method::POST, "/archipelago/mesh-typed") => {
+                Self::handle_mesh_typed_relay(self.rpc_handler.clone(), body_bytes).await
+            }
+
             // Blob upload — local/session use only. Session-authenticated so
             // only the node owner can push attachments into the blob store.
             (Method::POST, "/api/blob") => {

core/archipelago/src/api/handler/node_message.rs

@@ -1,6 +1,8 @@
+use crate::api::rpc::RpcHandler;
 use crate::node_message as node_msg;
 use super::build_response;use anyhow::Result;
 use hyper::{Response, StatusCode};
+use std::sync::Arc;
 
 use super::{ApiHandler, is_valid_pubkey_hex, sanitize_html, sanitize_log_string};
 
@@ -74,4 +76,85 @@ impl ApiHandler {
         }
         Ok(build_response(StatusCode::OK, "application/json", hyper::Body::from(r#"{"ok":true}"#)))
     }
+
+    /// Federation-routed mesh typed envelope. Body:
+    /// `{from_pubkey, from_name?, typed_envelope_b64, signature}`
+    /// Signature is ed25519 over the raw wire bytes, verified against
+    /// from_pubkey before dispatch.
+    pub(super) async fn handle_mesh_typed_relay(
+        rpc_handler: Arc<RpcHandler>,
+        body: hyper::body::Bytes,
+    ) -> Result<Response<hyper::Body>> {
+        use base64::{engine::general_purpose::STANDARD as BASE64, Engine as _};
+        #[derive(serde::Deserialize)]
+        struct Incoming {
+            from_pubkey: String,
+            #[serde(default)]
+            from_name: Option<String>,
+            typed_envelope_b64: String,
+            signature: String,
+        }
+        let incoming: Incoming = match serde_json::from_slice(&body) {
+            Ok(v) => v,
+            Err(e) => {
+                return Ok(build_response(
+                    StatusCode::BAD_REQUEST,
+                    "application/json",
+                    hyper::Body::from(format!(r#"{{"error":"bad json: {}"}}"#, e)),
+                ));
+            }
+        };
+        if !is_valid_pubkey_hex(&incoming.from_pubkey) {
+            return Ok(build_response(
+                StatusCode::BAD_REQUEST,
+                "application/json",
+                hyper::Body::from(r#"{"error":"invalid pubkey"}"#),
+            ));
+        }
+        let wire = match BASE64.decode(incoming.typed_envelope_b64.as_bytes()) {
+            Ok(v) => v,
+            Err(_) => {
+                return Ok(build_response(
+                    StatusCode::BAD_REQUEST,
+                    "application/json",
+                    hyper::Body::from(r#"{"error":"bad base64"}"#),
+                ));
+            }
+        };
+        match crate::identity::NodeIdentity::verify(&incoming.from_pubkey, &wire, &incoming.signature) {
+            Ok(true) => {}
+            _ => {
+                return Ok(build_response(
+                    StatusCode::FORBIDDEN,
+                    "application/json",
+                    hyper::Body::from(r#"{"error":"signature rejected"}"#),
+                ));
+            }
+        }
+
+        // Inject into mesh state via the shared MeshService. Mirrors a radio
+        // receive, so the message lands in the same chat stream as LoRa-
+        // delivered messages from the same peer.
+        let service = rpc_handler.mesh_service_arc();
+        let svc_guard = service.read().await;
+        let Some(svc) = svc_guard.as_ref() else {
+            return Ok(build_response(
+                StatusCode::SERVICE_UNAVAILABLE,
+                "application/json",
+                hyper::Body::from(r#"{"error":"mesh not running"}"#),
+            ));
+        };
+        if let Err(e) = svc
+            .inject_typed_from_federation(&incoming.from_pubkey, incoming.from_name.as_deref(), wire)
+            .await
+        {
+            tracing::warn!("mesh-typed relay inject failed: {}", e);
+            return Ok(build_response(
+                StatusCode::BAD_REQUEST,
+                "application/json",
+                hyper::Body::from(format!(r#"{{"error":"{}"}}"#, e)),
+            ));
+        }
+        Ok(build_response(StatusCode::OK, "application/json", hyper::Body::from(r#"{"ok":true}"#)))
+    }
 }