fix(memory-tree): rename window_days → time_window_days for query_global

query_global RPC and tool used  as the field name, but
DeepSeek (and some other providers) pass the parameter exactly as named
in the JSON schema — which was . This mismatch caused
parse errors on tool calls.

- Rename QueryGlobalRequest::window_days → time_window_days
- Update tool schema, description, and execute() to match
- Update RPC test to use the new field name

src/openhuman/memory/tree/retrieval/rpc.rs

@@ -84,7 +84,7 @@ pub async fn query_source_rpc(
 /// Request body for `memory_tree_query_global`.
 #[derive(Clone, Debug, Serialize, Deserialize)]
 pub struct QueryGlobalRequest {
-    pub window_days: u32,
+    pub time_window_days: u32,
 }
 
 /// JSON-RPC handler body for `memory_tree_query_global`.
@@ -92,7 +92,7 @@ pub async fn query_global_rpc(
     config: &Config,
     req: QueryGlobalRequest,
 ) -> Result<RpcOutcome<QueryResponse>, String> {
-    let resp = query_global(config, req.window_days)
+    let resp = query_global(config, req.time_window_days)
         .await
         .map_err(|e| format!("query_global: {e}"))?;
     let n = resp.hits.len();
@@ -410,7 +410,7 @@ mod tests {
     #[tokio::test]
     async fn query_global_rpc_returns_response_for_valid_window() {
         let (_tmp, cfg) = test_config();
-        let req = QueryGlobalRequest { window_days: 7 };
+        let req = QueryGlobalRequest { time_window_days: 7 };
         let outcome = query_global_rpc(&cfg, req).await.unwrap();
         assert!(outcome.value.hits.is_empty());
         assert_eq!(outcome.logs.len(), 1);

src/openhuman/tools/impl/memory/tree/query_global.rs

@@ -14,7 +14,7 @@ impl Tool for MemoryTreeQueryGlobalTool {
     }
 
     fn description(&self) -> &str {
-        "Return the cross-source global digest for the last `window_days`. \
+        "Return the cross-source global digest for the last `time_window_days`. \
          The 7-day digest is also pre-loaded into the session context at \
          start, so only call this for a different window (e.g. 30 days, \
          1 day) or to refresh after new ingest."
@@ -24,13 +24,13 @@ impl Tool for MemoryTreeQueryGlobalTool {
         json!({
             "type": "object",
             "properties": {
-                "window_days": {
+                "time_window_days": {
                     "type": "integer",
                     "minimum": 1,
                     "description": "Lookback window in days (e.g. 7 for weekly recap)."
                 }
             },
-            "required": ["window_days"]
+            "required": ["time_window_days"]
         })
     }
 
@@ -41,7 +41,7 @@ impl Tool for MemoryTreeQueryGlobalTool {
         let cfg = config_rpc::load_config_with_timeout()
             .await
             .map_err(|e| anyhow::anyhow!("memory_tree_query_global: load config failed: {e}"))?;
-        let resp = retrieval::query_global(&cfg, req.window_days).await?;
+        let resp = retrieval::query_global(&cfg, req.time_window_days).await?;
         log::debug!(
             "[tool][memory_tree] query_global returning hits={} total={}",
             resp.hits.len(),