icey 2.4.10

Fixed

• ICapture::start/::stop (which override basic::Startable) and MediaCapture::emit (which overrides PacketSource::emit) are now declared with override. clang-18 with -Werror -Winconsistent-missing-override was failing the bench build on these.
• [[nodiscard]] returns from AudioEncoder::encode, VideoEncoder::encode, MultiplexEncoder::encode{Video,Audio}, and VideoEncoder::flush are now explicitly discarded with (void) at the seven call sites in audiopacketencoder.cpp, multiplexpacketencoder.cpp, videoencoder.cpp, and videopacketencoder.cpp. Emission happens through the encoder's emitter, not through the boolean return; the discard was always intentional.

Changed

• The CI benchmarks job now runs under clang-18 instead of gcc-14. The gcc-14 build of the bench binaries hit SIGILL on the GitHub-hosted ubuntu-24.04 runner under -O3; the library itself builds and tests cleanly under gcc-14 in the regular Linux job and under all three sanitizer jobs. Tracked by nilstate/icey#325. icy_add_benchmark carries a -O2 -fno-tree-vectorize GCC fallback as defence in depth for anyone building bench binaries with GCC outside CI.
• Doc cross-links to the removed docs/build/* pages now redirect to the recipes/http-server recipe, the README quick-start, and docs/run/install. sourcey.config.ts, release-sync.sh, and release-check.sh no longer iterate over the deleted files.