Release/1.3.5 rc.2

[RaiBnod]

Summary

• Serialise LoRaRAW writes through a single scheduler: one frame on air at a time, wait for the device RESPONSE (or write_response_timeout, default 5s) before the next device's frame, round-robin across devices — concurrent writes to several devices no longer clobber each other's acks on the half-duplex radio
• Mark a point api-write-failed with a message once all write attempts get no response, instead of dropping it silently
• Count serial write errors as attempts and report the port as disconnected instead of pretending the frame was sent
• Replace the never-configurable time_off_air_default with write_response_timeout
• Fix writes failing with write queue full after a plugin disable/enable cycle (serial drainer now restarts on enable)
• Fix Rubix decoding of ai-raw (type 16): its serial map entry was lost in the codec refactor, so every field after it in a frame decoded as garbage
• Fix rubixDataEncoding decoder tests not compiling since the codec refactor