收口 MNote P0 P1 P2 审查尾项

- 归档 OnlyOffice live bridge、Page AI、mindmap、design governance 与相关 bug 条目
- 补齐 MinerU OCR 后端 runtime 合同与 smoke/test 基线
- 收口 ChatOnly/Doubao、ObjectIdentity、Page Aggregate compat 与 runtime owner 文档口径

验证：
- cargo test --manifest-path rust/Cargo.toml -p mnote-web local_ocr -- --test-threads=1
- cargo test --manifest-path rust/Cargo.toml -p mnote-web onlyoffice_bridge -- --test-threads=1
- git diff --check
- git diff --cached --check
- codegraph index . --force && codegraph status .
- codegraph sync . && codegraph status .

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

@@ -264,10 +264,18 @@ impl DocumentBuffer {
         self.base_content_hash = Some(content_hash);
         self.current_content_hash = None;
         self.dirty_state = DocBufferDirtyState::Clean;
-        if write_intent_id.as_deref().map(str::trim).is_some_and(|value| !value.is_empty()) {
+        if write_intent_id
+            .as_deref()
+            .map(str::trim)
+            .is_some_and(|value| !value.is_empty())
+        {
             self.last_write_intent_id = write_intent_id;
         }
-        if save_operation_id.as_deref().map(str::trim).is_some_and(|value| !value.is_empty()) {
+        if save_operation_id
+            .as_deref()
+            .map(str::trim)
+            .is_some_and(|value| !value.is_empty())
+        {
             self.last_save_operation_id = save_operation_id;
         }
         self.last_saved_at = Some(
@@ -922,7 +930,10 @@ mod tests {
             request.expected_file_version.as_deref(),
             Some("local-md:local-md:README.md:1:2:hash")
         );
-        assert_eq!(request.write_intent_id.as_deref(), Some("intent:editor:abc"));
+        assert_eq!(
+            request.write_intent_id.as_deref(),
+            Some("intent:editor:abc")
+        );
         assert_eq!(request.save_operation_id.as_deref(), Some("save:op:abc"));
         assert_eq!(request.content_format, "editorBlocks");
         assert_eq!(request.editor_source.as_deref(), Some("tiptap"));