diff --git a/design/03-rust-web/process/3-20-browser-runtime-followup-checklist-v1.md b/design/03-rust-web/process/3-20-browser-runtime-followup-checklist-v1.md
index 66a34c45..789c41d3 100644
--- a/design/03-rust-web/process/3-20-browser-runtime-followup-checklist-v1.md
+++ b/design/03-rust-web/process/3-20-browser-runtime-followup-checklist-v1.md
@@ -271,3 +271,13 @@ UI / 浏览器可见项必须有真实浏览器截图或结构化 smoke 证据
 - 2026-05-25：等待 Batch BF 只读审计期间，发现未批准 residual runner 自动启动了旧 Batch BE 的 4 个 worker（`0525-be-worker-a/b/c/d-*`），违反当前 goal 的“每批最多 2 个 worker”约束。
   - 处置：主控已统一终止相关 `reasonix-coding-runner` / `reasonix acp` / `reasonix/dist/cli/index.js acp` 进程；不读取、不采纳这些未授权 run 的 handoff、transcript 或 smoke 结果。
   - 影响：本文件中所有关于 Batch BE“按当前 goal 派发 4 worker”的口径均视为错误历史噪音，不作为事实源；后续 3-20 侧继续以已提交主线和受控 1-worker/2-worker 短批次为准。
+- 2026-05-25：Codex 主控继续收口 filetree upload preflight 的 document/workspace 数据采集层。
+  - 修改：`rust/crates/mnote-web/browser/filetree-runtime.js` 新增并导出 `fileTreeDocumentWorkspacesForUploadPreflight(workspaceId, deps)`；`layout.rs` 的同名壳层优先委托 runtime helper，并保留原 inline fallback。
+  - 边界：未迁 `preflightFileTreeUploadTarget` fetch、`ensureFileTreeWritableTarget`、`fallbackFileTreeUploadTarget`、upload/drop 编排或 sidebar refresh；本批只外置“从当前 filetree row 快照推导 documentId -> workspaceId 列表”的纯 DOM 数据采集。
+  - 已验证：`node --check rust/crates/mnote-web/browser/filetree-runtime.js`、`cargo fmt --manifest-path rust/Cargo.toml --all --check`、`cargo check --manifest-path rust/Cargo.toml -p mnote-web`、`cargo test --manifest-path rust/Cargo.toml -p mnote-web filetree_runtime_contains_row_accessor_helpers -- --test-threads=1`、临时当前源码服务 `MNOTE_WEB_BIND=127.0.0.1:3027 MNOTE_WEB_PUBLIC_BIND=127.0.0.1:3027 cargo run --manifest-path rust/Cargo.toml -p mnote-web`、`MNOTE_WEB_SMOKE_BASE_URL=http://127.0.0.1:3027 NODE_PATH=/mnt/Data1T/mnote/node_modules node scripts/task479-local-folder-markdown-resource-lifecycle-smoke.js`。
+  - 结果：`task479` 中 `editor-upload-to-page-resource-dir` 与 `filetree-folder-drop-to-target` 均 `ok:true`，说明该 preflight helper 外置未破坏本地 Markdown 附件上传或文件树文件夹拖入目标。
+- 2026-05-25：Codex 主控完成 filetree upload preflight 的 `documentWorkspaces` 低风险数据采样切片。
+  - 修改：`rust/crates/mnote-web/browser/filetree-runtime.js` 新增并导出 `fileTreeDocumentWorkspacesForUploadPreflight(workspaceId, deps)`；`rust/crates/mnote-web/src/ssr/pages/layout.rs::fileTreeDocumentWorkspacesForUploadPreflight` 优先委托 runtime helper，保留完整 inline fallback。
+  - 边界：未迁 `preflightFileTreeUploadTarget` 的 fetch/API 请求、`sidebarFileTreeSelection`、`currentDocumentId()`、`resolveWorkspaceId()`、fallback 降级或上传编排；本批只外置基于 `fileTreeRowsForUploadPreflight()` 的 documentId 去重与 workspaceId 映射。
+  - 已验证：`node --check rust/crates/mnote-web/browser/filetree-runtime.js`、`cargo fmt --manifest-path rust/Cargo.toml --all --check`、`cargo check --manifest-path rust/Cargo.toml -p mnote-web`、`cargo test --manifest-path rust/Cargo.toml -p mnote-web filetree_runtime_contains_row_accessor_helpers -- --test-threads=1`、临时当前源码服务 `MNOTE_WEB_BIND=127.0.0.1:3035 MNOTE_WEB_PUBLIC_BIND=127.0.0.1:3035 cargo run --manifest-path rust/Cargo.toml -p mnote-web`、`MNOTE_WEB_SMOKE_BASE_URL=http://127.0.0.1:3035 NODE_PATH=/mnt/Data1T/mnote/node_modules node scripts/task479-local-folder-markdown-resource-lifecycle-smoke.js`。
+  - 结果：`task479` 中 `editor-upload-to-page-resource-dir` 与 `filetree-folder-drop-to-target` 均 `ok:true`，说明本刀未破坏本地 Markdown 附件上传目标与文件树文件夹拖入目标路径。
diff --git a/rust/crates/mnote-web/browser/filetree-runtime.js b/rust/crates/mnote-web/browser/filetree-runtime.js
index 220b268b..38358933 100644
--- a/rust/crates/mnote-web/browser/filetree-runtime.js
+++ b/rust/crates/mnote-web/browser/filetree-runtime.js
@@ -475,6 +475,21 @@ function fileTreeDropPreflightRows(deps) {
   });
 }
 
+function fileTreeDocumentWorkspacesForUploadPreflight(workspaceId, deps) {
+  deps = deps || {};
+  var rows = typeof deps.fileTreeRowsForUploadPreflight === 'function'
+    ? deps.fileTreeRowsForUploadPreflight()
+    : fileTreeRowsForUploadPreflight(deps);
+  var seen = new Set();
+  return rows.filter(function(row) {
+    if (!row.documentId || seen.has(row.documentId)) return false;
+    seen.add(row.documentId);
+    return true;
+  }).map(function(row) {
+    return { documentId: row.documentId, workspaceId: workspaceId || null };
+  });
+}
+
 window.__mnoteFileTreeRuntime = {
   readProjection: readProjection,
   readSidebarDataset: readSidebarDataset,
@@ -509,5 +524,6 @@ window.__mnoteFileTreeRuntime = {
   fileTreeRowsForUploadPreflight: fileTreeRowsForUploadPreflight,
   fileTreeDocumentParentsForPreflight: fileTreeDocumentParentsForPreflight,
   fileTreeTargetChildrenForPreflight: fileTreeTargetChildrenForPreflight,
-  fileTreeDropPreflightRows: fileTreeDropPreflightRows
+  fileTreeDropPreflightRows: fileTreeDropPreflightRows,
+  fileTreeDocumentWorkspacesForUploadPreflight: fileTreeDocumentWorkspacesForUploadPreflight
 };
diff --git a/rust/crates/mnote-web/src/ssr/pages/layout.rs b/rust/crates/mnote-web/src/ssr/pages/layout.rs
index 9c4b34b7..94b80117 100644
--- a/rust/crates/mnote-web/src/ssr/pages/layout.rs
+++ b/rust/crates/mnote-web/src/ssr/pages/layout.rs
@@ -3116,6 +3116,12 @@ const SIDEBAR_TREE_JS: &str = r##"
   }
 
   function fileTreeDocumentWorkspacesForUploadPreflight(workspaceId) {
+    var runtimeFn = fileTreeRuntimeFunction('fileTreeDocumentWorkspacesForUploadPreflight');
+    if (runtimeFn) {
+      return runtimeFn(workspaceId, Object.assign({}, fileTreeRuntimeDeps(), {
+        fileTreeRowsForUploadPreflight: fileTreeRowsForUploadPreflight
+      }));
+    }
     var seen = new Set();
     return fileTreeRowsForUploadPreflight().filter(function(row) {
       if (!row.documentId || seen.has(row.documentId)) return false;
@@ -11186,6 +11192,9 @@ mod tests {
         assert!(FILETREE_RUNTIME_JS.contains("function fileTreeDocumentParentsForPreflight"));
         assert!(FILETREE_RUNTIME_JS.contains("function fileTreeTargetChildrenForPreflight"));
         assert!(FILETREE_RUNTIME_JS.contains("function fileTreeDropPreflightRows"));
+        assert!(
+            FILETREE_RUNTIME_JS.contains("function fileTreeDocumentWorkspacesForUploadPreflight")
+        );
         assert!(FILETREE_RUNTIME_JS.contains("function readProjection"));
         assert!(FILETREE_RUNTIME_JS.contains("function readSidebarDataset"));
         assert!(FILETREE_RUNTIME_JS.contains("function readDatasetProjection"));
@@ -11217,6 +11226,13 @@ mod tests {
         assert!(
             FILETREE_RUNTIME_JS.contains("fileTreeDropPreflightRows: fileTreeDropPreflightRows")
         );
+        assert!(FILETREE_RUNTIME_JS.contains(
+            "fileTreeDocumentWorkspacesForUploadPreflight: fileTreeDocumentWorkspacesForUploadPreflight"
+        ));
+        assert!(SIDEBAR_TREE_JS
+            .contains("fileTreeRuntimeFunction('fileTreeDocumentWorkspacesForUploadPreflight')"));
+        assert!(SIDEBAR_TREE_JS
+            .contains("fileTreeRowsForUploadPreflight: fileTreeRowsForUploadPreflight"));
         assert!(FILETREE_RUNTIME_JS
             .contains("uploadIntent: String(detail.uploadIntent || 'filetree.folder.drop')"));
         assert!(FILETREE_RUNTIME_JS