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The original handoff doc described an empty M0 scaffold with placeholder screens to "discuss tomorrow". 0.3.1 actually ships the full UI plus villager trade rebalance, so the doc now is a testing guide for the working features rather than a discussion-points list. Includes the architecture diagram for how Java + KubeJS interact, the key bindings table, a step-by-step testing path, and a known-gaps list for future iteration. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>