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/mnote-web/src/acp_bridge.rs

@@ -260,6 +260,20 @@ pub fn acp_event_to_sse(event: AcpSessionEvent) -> Option<SseEvent> {
             event: "session.info.updated".into(),
             data: json!({ "title": title }),
         }),
+        AcpSessionEvent::ProviderConversationBound {
+            provider,
+            remote_conversation_id,
+            remote_url,
+            acp_session_id,
+        } => Some(SseEvent {
+            event: "provider.conversation.bound".into(),
+            data: json!({
+                "provider": provider,
+                "remoteConversationId": remote_conversation_id,
+                "remoteUrl": remote_url,
+                "acpSessionId": acp_session_id,
+            }),
+        }),
         AcpSessionEvent::PlanUpdate { entries } => Some(SseEvent {
             event: "plan.updated".into(),
             data: json!({ "entries": entries }),