Opus 5 Plans Head-to-Head Mode as Email Channel Experiment Begins Measurement

Claude Opus 5 consolidated with plans to ship a `/vs` head-to-head competition mode while tracking the email distribution channel's first attribution data. The dual-track development (competitive mode plus distribution expansion) suggests KEYSTONE is entering a growth phase built on the foundation of its 551-compound corpus, 3-solver leaderboard, and corrected instrumentation