v1.0.0: Boundary mode with bidirectional LoRa↔TCP transport

Vendor microReticulum library with boundary mode transport fixes:
- Two-whitelist system gates backbone traffic (local addresses +
  mentioned addresses from local devices)
- Allow control_hashes and local destinations through boundary filter
  (fixes backbone→LoRa path discovery)
- Fix get_cached_packet() to call unpack() instead of update_hash()
  (fixes empty destination_hash in path responses)
- LRPROOF Identity::recall null guard
- remaining_hops HEADER_1/BROADCAST fix for final-hop delivery
- PROOF packets excluded from boundary wrapping
- Iterator invalidation fix in transport table cleanup
- is_backbone flag replaces string matching for interface identification

Firmware changes:
- Set is_backbone(true) on backbone TCP interface
- Rename default TcpInterface name to BackboneInterface
- Update comments for dual-use TcpInterface (backbone + local AP)
- Use vendored lib/microReticulum instead of PlatformIO registry

lib/microReticulum/src/Channel.h

@@ -0,0 +1,57 @@
+#pragma once
+
+#include "Destination.h"
+#include "Type.h"
+
+#include <memory>
+#include <cassert>
+
+namespace RNS {
+
+	class Channel {
+
+	public:
+		Channel(Type::NoneConstructor none) {
+			MEM("Channel NONE object created");
+		}
+		Channel(const Channel& resource) : _object(resource._object) {
+			MEM("Channel object copy created");
+		}
+		virtual ~Channel(){
+			MEM("Channel object destroyed");
+		}
+
+		Channel& operator = (const Channel& resource) {
+			_object = resource._object;
+			return *this;
+		}
+		operator bool() const {
+			return _object.get() != nullptr;
+		}
+		bool operator < (const Channel& resource) const {
+			return _object.get() < resource._object.get();
+			//return _object->_hash < resource._object->_hash;
+		}
+
+	public:
+		void _shutdown() {}
+
+	private:
+		class Object {
+		public:
+			Object() { MEM("Channel::Data object created, this: " + std::to_string((uintptr_t)this)); }
+			virtual ~Object() { MEM("Channel::Data object destroyed, this: " + std::to_string((uintptr_t)this)); }
+		private:
+
+		friend class Channel;
+		};
+		std::shared_ptr<Object> _object;
+
+	};
+
+
+	class ChannelAdvertisement {
+
+	};
+
+}