chore: 保存当前架构收口与 bug 修复快照

归档本轮 P0/P1 bug 修复、设计审查迁移、AI selection scope 收口与 stream contract 调整，并保留当前 05 主线迁移起点。

rust/crates/mnote-web/src/routes/stream_support.rs

@@ -574,6 +574,18 @@ pub fn with_stream_kind(payload: &Value, kind: &str) -> Value {
     })
 }
 
+pub fn build_stream_push_delta_hint(payload: &Value, request_id: &str, trace_id: &str) -> Value {
+    json!({
+        "kind": "delta",
+        "hint": "command_committed",
+        "commandName": payload.get("commandName"),
+        "commandId": payload.get("commandId"),
+        "workspaceId": payload.get("workspaceId"),
+        "requestId": request_id,
+        "traceId": trace_id,
+    })
+}
+
 pub async fn build_stream_delta_payload(
     config: &AppConfig,
     context: &RequestContext,
@@ -1042,7 +1054,7 @@ mod tests {
                     "id": "clog_2",
                     "command_id": "cmd_2",
                     "created_at": "2026-04-25T10:00:02Z",
-                    "command_name": "tree.resource.delete",
+                    "command_name": "tree.resource.archive",
                     "payload": {
                         "streamDelta": {
                             "op": "remove_asset",