ChimpFlow 0.1.4 — OmniNet via FetchContent at main, own buffer sizing

OmniNet consumed via CMake FetchContent (leestripp/omninet.git, GIT_TAG main)
with a configure-time fast-forward to the origin/main tip so every build
compiles the latest upstream code (never pin, never patch locally).
Upstream v1.0.5 fixed all three reported bugs (body cap honors
maxRequestSize, new ServerConfig::maxBufferSize, API-key underscore split);
ChimpFlow sets maxRequestSize=24MB / maxBufferSize=32MB for worst-case
120s stereo uploads. Verified live with a 19.4MB STT upload.