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docs: update SOURCE_ROUTING.md with two-way handshake requirement

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callebtc
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@@ -91,6 +91,13 @@ To calculate routes, nodes need a view of the network topology. This is achieved
``` ```
Nodes receiving this TLV update their local mesh graph, linking the sender to the listed neighbors. Nodes receiving this TLV update their local mesh graph, linking the sender to the listed neighbors.
### Edge Verification (Two-Way Handshake)
To prevent spoofing and routing through stale connections, the Mesh Graph service implements a strict two-way handshake verification:
* **Unconfirmed Edge:** If Peer A announces Peer B, but Peer B does *not* announce Peer A, the connection is treated as **unconfirmed**. Unconfirmed edges are visualized as dotted lines in debug tools but are **excluded** from route calculations.
* **Confirmed Edge:** An edge is only valid for routing when **both** peers explicitly announce each other in their neighbor lists. This ensures that the connection is bidirectional and currently active from both perspectives.
--- ---
## 5. Fragmentation & Source Routing ## 5. Fragmentation & Source Routing