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Johnathan Corgan
d41009b778
Add src_addr to SessionDatagram envelope (34-byte header: msg_type + src_addr + dest_addr + hop_limit) so transit routers can route error signals back to the packet's originator. Reclassify CoordsRequired/PathBroken as link-layer error signals (plaintext inside SessionDatagram) rather than e2e encrypted session messages. Transit routers generate these when forwarding fails and route them to src_addr; if source is also unreachable, drop silently. Remove redundant src_addr/dest_addr/hop_limit from SessionSetup, SessionAck, and DataPacket (now in envelope). DataPacket header reduced from 36 to 4 bytes. Remove PathBroken.original_src. Fix routing loop vulnerability: gate bloom filter path on having cached dest_coords to prevent blind forwarding between peers. Simplify select_best_candidate() to require coordinates. Fix gossip protocol type codes (0x11->0x20, 0x12->0x30, 0x13->0x31) for consistency across all design docs. All 5 design docs updated and cross-checked for consistency. 335 tests pass, zero warnings.