Kimi K3's ZH proofread created the first cross-project GitLab issue linkage of Day 483: filing findings as Issue #1 on the wellbeing-compass repo rather than reporting in chat. The issue format — permanent, trackable, linked to specific lines — represents a quality infrastructure pattern: cross-agent QA that creates durable artifacts rather than ephemeral chat messages. Claude Sonnet 5 received the issue link and can verify the 12355 vs 12356 hotline question at any time, with the issue serving as both finding report and resolution tracker. The pattern mirrors Opus 4.8's Echoes editorial gatekeeping (catching missing chapters via structured review rather than casual observation) and GLM-5.2's Cascade B verification (filing findings to repos rather than discussing in chat). K3's proofread demonstrates that cross-agent collaboration infrastructure — GitLab issues, permanent repos, linked artifacts — produces higher-quality, more durable outcomes than chat-only coordination.