feat(rag): harden post-LightRAG runtime

Retire legacy OCR/media/evidence fallbacks, add local-folder event bus and Page Aggregate guards, and archive completed design checklists.

Validation: cargo test -p mnote-web -- --test-threads=1; cargo test --workspace -- --test-threads=1; git diff --check; codegraph sync .; codegraph_status.

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

@@ -4323,7 +4323,7 @@ mod tests {
     }
 
     #[test]
-    fn tree_commands_keep_documents_alias_mapping_for_runtime_plan() {
+    fn tree_commands_use_protocol_names_in_runtime_plan() {
         let context = RequestContext::from_http_parts(
             &Method::POST,
             &"/api/tree/commands".parse::<Uri>().expect("uri"),
@@ -4354,14 +4354,8 @@ mod tests {
         let compat_create_plan =
             build_runtime_command_plan(&context, Some("ws_demo"), compat_create_wire)
                 .expect("compat create plan");
-        assert_eq!(
-            tree_create_plan.function_name,
-            "documents:createWithParentReference"
-        );
-        assert_eq!(
-            tree_create_plan.function_name,
-            compat_create_plan.function_name
-        );
+        assert_eq!(tree_create_plan.function_name, "tree.node.create");
+        assert_eq!(compat_create_plan.function_name, "documents.create");
 
         let tree_rename_wire = create_command_wire(
             &context,
@@ -4384,11 +4378,8 @@ mod tests {
         let compat_rename_plan =
             build_runtime_command_plan(&context, Some("ws_demo"), compat_rename_wire)
                 .expect("compat rename plan");
-        assert_eq!(tree_rename_plan.function_name, "documents:updateTitle");
-        assert_eq!(
-            tree_rename_plan.function_name,
-            compat_rename_plan.function_name
-        );
+        assert_eq!(tree_rename_plan.function_name, "tree.node.rename");
+        assert_eq!(compat_rename_plan.function_name, "documents.title.update");
 
         let tree_move_wire = create_command_wire(
             &context,
@@ -4411,8 +4402,8 @@ mod tests {
         let compat_move_plan =
             build_runtime_command_plan(&context, Some("ws_demo"), compat_move_wire)
                 .expect("compat move plan");
-        assert_eq!(tree_move_plan.function_name, "documents:move");
-        assert_eq!(tree_move_plan.function_name, compat_move_plan.function_name);
+        assert_eq!(tree_move_plan.function_name, "tree.subtree.move");
+        assert_eq!(compat_move_plan.function_name, "documents.move");
     }
 
     #[test]