Agent 媒体桥：解 stub inspect_timeline（合成帧之眼）+ import_media（path/bytes）#182
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Give the agent eyes and hands: a new injected MediaBridge trait carries the two
capabilities the agent crate deliberately cannot link (wgpu compositing lives in
opentake-render; the user-facing import path lives behind src-tauri MediaState),
keeping CoreHandle the narrow document surface and dispatch unit-testable with a
fake bridge (default trait methods return "not available", so non-Tauri builds
run bridge-less).
- inspect_timeline (upstream ToolExecutor+InspectTimeline.swift): renders the
composited frame at startFrame, or maxFrames (default 6, cap 12) evenly
sampled across [startFrame,endFrame) with upstream's exact center-of-bucket
formula; aspect-preserving downscale to 512 longest edge (never upscales);
JPEG q70 per frame + a meta block {fps,width,height,totalFrames,frameNumbers}.
All range/validation errors mirror upstream strings. TauriMediaBridge
composites via a self-contained RenderDevice per call (export.rs's isolation
discipline, not the preview's cached RenderState).
- import_media (upstream ToolExecutor+Import.swift): exactly-one-of url/path/
bytes with upstream's validation set (folderId existence, bytes<=15MB base64 +
required mimeType with the 1:1 MIME table, path missing/unsupported-ext
messages); path reuses the SAME import_one/mirror_dir path as the media panel
(posters/manifest/events consistent), directories mirror recursively; bytes
writes imported-<uuid8>.<ext> into bundle media/. url returns a structured
not-yet-supported error (no HTTP client dep chosen yet; flagged for follow-up
— upstream caps downloads at 1GB HTTPS-only).
Gates: fmt/clippy -D warnings clean; cargo test --workspace 1408 (agent 221);
pnpm build clean; pnpm test 330.
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新 MediaBridge 注入 trait（agent crate 不背 wgpu 依赖，dispatch 可用假桥单测；默认实现返回不可用）。inspect_timeline 1:1 上游（默认 6 帧/上限 12、bucket 中心采样公式、512 长边降采样、JPEG q70 + meta 块）；import_media path/bytes 全通（path 复用媒体面板同一导入路径，目录递归镜像；bytes 写入 bundle media/），url 返回结构化未支持错误（HTTP 客户端依赖待选，follow-up）。门禁：workspace 1408 + web 330 全绿。