Initial commit: RNodeTHV4 boundary mode firmware for Heltec V4

Bridges LoRa mesh and TCP/WiFi backbone networks using microReticulum.
Based on microReticulum_Firmware with boundary mode additions:
- BoundaryMode.h: State management and EEPROM persistence
- BoundaryConfig.h: WiFi captive portal for configuration
- TcpInterface.h: TCP backbone interface with HDLC framing
- Display.h: Custom OLED layout with network status indicators
- Transport/Identity library patches for embedded memory constraints

Console/source/contact.md

@@ -0,0 +1,20 @@
+[title]: <> (Contact)
+# Contact Me
+
+**Hello!** I am the creator of the RNode ecosystem.
+
+If you have any general questions or comments about any of the projects I maintain, I encourage you to post it in one of the following places:
+
+- The [discussion forum](https://github.com/markqvist/Reticulum/discussions) on GitHub
+- The [Reticulum Matrix Channel](#reticulum:matrix.org) at `#reticulum:matrix.org`
+- The [Reticulum subreddit](https://reddit.com/r/reticulum)
+
+To get in touch with me personally, you can use one of the following methods, in order of preference:
+
+- LXMF at `8dd57a738226809646089335a6b03695`
+- Matrix using `@unsignedmark:matrix.org`
+- Email by using the address mark at unsigned dot io
+ 
+Please use the public forums and channels for support and help requests. I receive a lot of messages, and while I try to answer everyone (eventually), this is not always possible.
+
+<center>`3502`</center>