Release v4.2.1

What's Changed

• CUDA: software-pipelined internal rounds, free-addend products, no early exit by @n13 in #104
• Clarify mining logs: real job-stop reasons and per-type worker numbering by @illuzen in #108
• docs: clarify GPU benchmark platform context by @Kewe63 in #107
• quic-transport: bump quinn to 0.11 (CVE-2026-31812) by @n13 in #111
• Release v4.2.1 by @n13 in #112

New Contributors

• @Kewe63 made their first contribution in #107

Full Changelog: v4.2.0...v4.2.1