v1.0.13: Fix path discovery starvation and remove redundant announce echo blocking
Immediate PATH_RESPONSE for local clients: On ESP32, continuous TCP backbone data can starve the jobs() loop for many seconds, causing path discovery timeouts for local TCP clients. When a local client's path request is satisfied by a cached announce, send the PATH_RESPONSE immediately rather than queuing it for the next jobs() cycle. Remove boundary-mode announce echo blocking: The boundary-specific code that prevented backbone announces from overwriting LoRa paths was redundant (the standard random_blob check already prevents echoes) and harmful (it blocked TCP clients from learning backbone paths and prevented correct transport routing for LINKREQUESTs).
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