收口本地工作区清理与资源投影

清理历史 Electron、Graphify、沙箱和截图等仓库跟踪残留，补充 CodeGraph 与 Convex active deploy source 协作说明。

新增 tree-first 下一阶段设计稿和 2026-05-20 清理总结，记录本地工作区、路径身份和 Zed/Lapce/VSCode 参考收口方向。

扩展 Rust Web 本地文件夹、DocumentBuffer、mindmap 资源、tree runtime 和页面聚合链路，并补充 task455 local-folder mindmap clean smoke。

验证：git diff --check 通过；pnpm store status --store-dir .pnpm-store 通过；npm ls --depth=0 --json 通过；find -L node_modules 未发现断链。cargo test -p mnote-web 当前 418 passed / 35 failed。

rust/crates/core-protocol/src/lib.rs

@@ -15,11 +15,12 @@ pub use ai::{
     AiShareContext, AiStructuredWriteKind, AiStructuredWriteResult, AiToolCall,
 };
 pub use command::{
-    CommandEnvelope, CopyTreeDocumentPages, CreateDocumentPage, CreatePage, CreateWorkspace,
-    DeleteBlock, DeleteDocumentPage, DuplicateDocumentPage, EmbedBlock, InsertBlock, MoveBlock,
-    MoveDocumentPage, PatchBlock, PatchPageBlock, PutMindmap, ReplaceMediaAssetStorage,
-    RestoreDocumentPage, SavePageContent, UpdateBlock, UpdatePageOptions, UpdatePageStats,
-    UpdatePageTitle,
+    check_when, evaluate_when, is_command_enabled, parse_when_expr, CommandContext,
+    CommandContextValue, CommandEnvelope, CopyTreeDocumentPages, CreateDocumentPage, CreatePage,
+    CreateWorkspace, DeleteBlock, DeleteDocumentPage, DuplicateDocumentPage, EmbedBlock,
+    InsertBlock, MoveBlock, MoveDocumentPage, PatchBlock, PatchPageBlock, PutMindmap,
+    ReplaceMediaAssetStorage, RestoreDocumentPage, SavePageContent, UpdateBlock, UpdatePageOptions,
+    UpdatePageStats, UpdatePageTitle, WhenExprNode, WhenExprToken,
 };
 pub use common::{
     ActorPayload, AffectedObject, ErrorDetail, ErrorPayload, OkPayload, RequestMeta, ResponseMeta,