feat(scripts): PoC 阶段 1 - CLI + Layer00619 BackHall 端到端跑通
- scripts/legacy-layer-to-cocos-prefab-cli.mjs (CLI 入口: <inputXml> [<youlePrefab>] <outputDir>) - framework-tests/legacy-layer-migration/poc-iconbutton.test.mjs (1 个 node:test 端到端校验 cc.Prefab 头 + group-55 父节点) - YouleNexus/out/legacy-migration/BackHall_Layer.prefab (生成产物, 437 lines) - YouleNexus/out/legacy-migration/BackHall_Layer.prefab.diff (vs YouleNexus Layer619_BackOtherGame.prefab, 1244 lines) 累计: 30/30 PASS (29 prior + 1 PoC). Layer00619 (1 Spirit, type=3 ProgressBar, group=55) 是最简 PoC, diff 大是预期 (脚本首个端到端输出 vs 手写 prefab 必然差异大). Co-Authored-By: Claude Code <noreply@anthropic.com>
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