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Convert UDP stress test from echo to one-way - #402
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The echo design overloaded the server's receive buffer at even modest volumes — UDP provides no receiver-side backpressure, so every dropped datagram was a silent false failure. The one-way design sends client→server only and reports results via actor messaging, which eliminates the echo path and halves the UDP traffic. The server now verifies each datagram's payload against a per-client keystream (4-byte header: 1 byte client id + 3 bytes sequence number), catching corruption the echo design would have detected. The conservation check (client_sent == server_received) stays, at volumes low enough that the receiver's kernel buffer never overflows — a conservation failure at these volumes is a lori event-delivery bug. Volume limits are sharply reduced (RUN_MAX_ROUND_TRIPS 500K→10K, RUN_MAX_BYTES 2GB→50MB, clients max 32→4, datagram buckets ~5x smaller) so the test budget goes to breadth of configurations rather than raw volume per run. CI schedule moves from once daily to 3x/day.
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The echo design overloaded the server's receive buffer at even modest volumes — UDP provides no receiver-side backpressure, so every dropped datagram was a silent false failure. All three CI platforms failed on the first run.
This converts the stress test to one-way (client→server only). Results come back via actor messaging instead of UDP echo.
Engine changes:
Volume reduction:
RUN_MAX_ROUND_TRIPS500K → 10KRUN_MAX_BYTES2GB → 50MBThe test budget goes to breadth of configurations rather than raw volume per run.
CI: Once daily → 3x/day (0:00, 8:00, 16:00 UTC).