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Reframe §1 away from a redesign-of-the-old-plugin narrative and root it in the real-world problem: coediting a markdown document with a machine is hard today (rewrite-not-a-diff, all-or-nothing, blurred authorship, no clean rendered view, opaque machine work). Solution and technical substance stand on their own; proven patterns reused on merit, not as old-plugin lineage. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>