feat: Page AI Reasonix desktop session alignment, settings IA cleanup, knowledge RAG hardening

- ACP client/session manager: Reasonix desktop live session context
- Hermes tools: knowledge_rag tool manifest and skill updates
- Browser runtime: sidebar page AI permission/profile/render/session/tree modules
- Routes: hermes_client, hermes_tools, knowledge_rag, web_shell
- Scripts: reasonix ACP wrapper, LightRAG MCP, smoke tasks 159/558/559/561/562
- Skills: mnote-knowledge-rag and mnote-lightrag-bridge SKILL.md updates

rust/crates/mnote-web/src/hermes_tools/manifest.rs

@@ -14,6 +14,7 @@ pub fn manifest() -> Value {
         doc_find_tool(),
         knowledge_rag_status_tool(),
         knowledge_rag_query_tool(),
+        knowledge_rag_section_context_tool(),
         knowledge_rag_open_reference_tool(),
         block_fetch_tool(),
         doc_plan_update_tool(),
@@ -328,6 +329,14 @@ fn knowledge_rag_query_tool() -> Value {
             "includeChunkContent".into(),
             json!({ "type": "boolean", "default": true }),
         );
+        map.insert(
+            "includeDocumentStructureIndex".into(),
+            json!({
+                "type": "boolean",
+                "default": false,
+                "description": "返回由 LightRAG sidecar headings 派生的 document_structure_index；适合大书/长文档问题做章节导航和上下文扩展，不替代 references 引用证据。"
+            }),
+        );
         map.insert(
             "sourcePaths".into(),
             json!({
@@ -376,6 +385,51 @@ fn knowledge_rag_open_reference_tool() -> Value {
     })
 }
 
+fn knowledge_rag_section_context_tool() -> Value {
+    let mut properties = base_identity_properties();
+    if let Value::Object(map) = &mut properties {
+        map.insert("rootUri".into(), json!({ "type": "string" }));
+        map.insert("sourcePath".into(), json!({ "type": "string" }));
+        map.insert("sourceId".into(), json!({ "type": "string" }));
+        map.insert("lightRagDocId".into(), json!({ "type": "string" }));
+        map.insert("filePath".into(), json!({ "type": "string" }));
+        map.insert("sectionId".into(), json!({ "type": "string" }));
+        map.insert("startBlockOrdinal".into(), json!({ "type": "integer" }));
+        map.insert("endBlockOrdinal".into(), json!({ "type": "integer" }));
+        map.insert("startParagraphOrdinal".into(), json!({ "type": "integer" }));
+        map.insert("endParagraphOrdinal".into(), json!({ "type": "integer" }));
+        map.insert(
+            "contextBefore".into(),
+            json!({ "type": "integer", "default": 1 }),
+        );
+        map.insert(
+            "contextAfter".into(),
+            json!({ "type": "integer", "default": 1 }),
+        );
+        map.insert(
+            "maxBlocks".into(),
+            json!({ "type": "integer", "default": 24 }),
+        );
+        map.insert(
+            "maxChars".into(),
+            json!({ "type": "integer", "default": 12000 }),
+        );
+    }
+    json!({
+        "name": "mnote.knowledge_rag.section_context",
+        "description": "按 documentStructureIndex section 的 block/paragraph range，从 LightRAG native sidecar 拉取有限正文 blocks/chunks，供大书/长文档二次解读；不做检索、重排或 fallback。",
+        "schemaVersion": TOOL_SCHEMA_VERSION,
+        "capabilityScope": ["knowledge_rag.read", "evidence.read"],
+        "status": "available",
+        "annotations": tool_annotations(true, false, true, false),
+        "inputSchema": {
+            "type": "object",
+            "required": ["workspaceId", "rootUri"],
+            "properties": properties
+        }
+    })
+}
+
 // 旧 local index agent 工具仅保留为历史对照；当前 manifest() 不注册这些工具。
 #[allow(dead_code)]
 fn index_status_tool() -> Value {