feat(tree): complete rust family runtime checklist

- add tree shell runtime artifact contracts and page/filetree/picker runtime reducers
- sink tree.subtree.move write operation through Rust and formalize command event plans
- harden file tree search projection contract and route thin-proxy boundaries
- record completed harness tasks and move design docs into process/done

wolai-frontend/src/lib/tree-stream/tree-delta.test.ts

@@ -470,6 +470,14 @@ describe("tree-stream/tree-delta", () => {
     expect(next).toEqual(baseSidebarData);
   });
 
+  it("支持 resync_required delta 仅推进 cursor，等待后续 snapshot/resync", () => {
+    const next = applyTreeStreamDelta(baseSidebarData, {
+      op: "resync_required",
+    });
+
+    expect(next).toEqual(baseSidebarData);
+  });
+
   it("为 page_tree 定义统一 delta 应用边界，并可稳定派生页面行", () => {
     const next = applyTreeStreamDeltaToProjectionState({
       projection: "page_tree",
@@ -557,6 +565,59 @@ describe("tree-stream/tree-delta", () => {
     });
   });
 
+  it("file_tree fixture 覆盖搜索 hardening 需要的 index、asset-folder、mindmap child、book 与 pdf 资源类型", () => {
+    const next = applyTreeStreamDeltaToProjectionState({
+      projection: "file_tree",
+      base: fileTreeProjectionBase,
+      event: {
+        op: "replace_documents",
+        documents: [...fileTreeProjectionBase.documents],
+      },
+    });
+    const rowById = new Map(next.fileTreeItems.map((item) => [item.rowId, item]));
+
+    expect(rowById.get("index:root")).toMatchObject({
+      rowKind: "index",
+      title: "index.md",
+      resourceMeta: expect.objectContaining({
+        resourceKind: "index",
+        documentId: "root",
+      }),
+    });
+    expect(rowById.get("asset-folder:asset_mindmap")).toMatchObject({
+      rowKind: "asset_folder",
+      title: "mindmap",
+      resourceMeta: expect.objectContaining({
+        resourceKind: "mindmap",
+        assetKind: "mindmap",
+      }),
+    });
+    expect(rowById.get("asset:asset_mindmap_child")).toMatchObject({
+      rowKind: "asset",
+      parentNodeId: "asset-folder:asset_mindmap",
+      resourceMeta: expect.objectContaining({
+        resourceKind: "asset",
+        assetKind: "image",
+      }),
+    });
+    expect(rowById.get("asset:asset_book")).toMatchObject({
+      rowKind: "asset",
+      iconHint: "book",
+      resourceMeta: expect.objectContaining({
+        resourceKind: "book",
+        assetKind: "book",
+      }),
+    });
+    expect(rowById.get("asset:asset_pdf")).toMatchObject({
+      rowKind: "asset",
+      iconHint: "pdf",
+      resourceMeta: expect.objectContaining({
+        resourceKind: "pdf",
+        assetKind: "pdf",
+      }),
+    });
+  });
+
   it("支持 upsert_assets 更新资源归属并重建 file_tree projection", () => {
     const next = applyTreeStreamDeltaToProjectionState({
       projection: "file_tree",

wolai-frontend/src/lib/tree-stream/tree-delta.ts

@@ -23,6 +23,7 @@ export type TreeStreamDocumentPatch =
 
 export type TreeStreamDeltaOp =
   | "noop"
+  | "resync_required"
   | "upsert_document"
   | "upsert_documents"
   | "upsert_assets"
@@ -236,6 +237,10 @@ export function applyTreeStreamDelta(
     return base;
   }
 
+  if (event.op === "resync_required") {
+    return base;
+  }
+
   if (event.op === "replace_sidebar" && event.sidebar) {
     if ("activeWorkspaceId" in event.sidebar) {
       return cloneSidebarData(event.sidebar as SidebarInitialData);