{"file": ".trellis/spec/preview/index.md", "reason": "预览层契约：无构建步骤、零依赖 IIFE、参数经 window.OSM_ASSET_PREVIEW_CONFIG 注入。overlay 与 cesium-preview.js 的所有改动都受这些约束。"}
{"file": ".trellis/spec/pipeline/index.md", "reason": "确认 build-area.js 如何把 v2x-cesium-overlay.js 拷入产物，避免误增文件破坏包契约。"}
{"file": ".trellis/spec/config/index.md", "reason": "新增可选配置 v2xPreview.phaseSignalMap / maxDistanceMeters / maxHeadingDeltaDegrees 需符合区域配置约定。"}
{"file": "docs/v2x-cesium-preview.md", "reason": "现有 V2X 预览文档：配置项、坐标契约、代理要求、回滚方式。移除 FlowTravelRatio 与新增配置后需同步更新。"}