fix(#1163): avoid streaming JSON tree copies

app/src/main/java/com/m57/hermescontrol/data/ws/EventParser.kt

@@ -2,6 +2,7 @@ package com.m57.hermescontrol.data.ws
 
 import android.util.Log
 import com.m57.hermescontrol.ui.chat.extractTodosFromMap
+import kotlinx.serialization.json.JsonObject
 
 /**
  * Converts raw [JsonRpcResponse] objects into typed [WsEvent] instances.
@@ -38,8 +39,22 @@ object EventParser {
         }
 
         // ── Notification / event (no id, has method) ─────────────────────
+        val jsonParams = response.params ?: return WsEvent.Unknown(rawJson)
+        // Issue #1163: token events need only scalar lookups, never recursive map/list copies.
+        val eventType = jsonParams["type"].eventStringOrNull()
+        if (eventType == "message.token" || eventType == "message.delta" ||
+            eventType == "thinking.delta" || eventType == "reasoning.delta"
+        ) {
+            val sessionId = jsonParams.eventSessionId()
+            val token = (jsonParams["payload"] as? JsonObject)?.get("text").eventStringOrNull() ?: ""
+            return when (eventType) {
+                "thinking.delta" -> WsEvent.ThinkingDelta(token, sessionId)
+                "reasoning.delta" -> WsEvent.ReasoningDelta(token, sessionId)
+                else -> WsEvent.MessageToken(token, sessionId)
+            }
+        }
         @Suppress("UNCHECKED_CAST")
-        val params = response.params?.toAny() as? Map<String, Any?> ?: return WsEvent.Unknown(rawJson)
+        val params = jsonParams.toAny() as Map<String, Any?>
         return parseParams(params, rawJson)
     }
 

app/src/main/java/com/m57/hermescontrol/data/ws/HermesWsClient.kt

@@ -1316,12 +1316,9 @@ object HermesWsClient {
                     }
 
                     if (rpc.id == null) {
-                        @Suppress("UNCHECKED_CAST")
-                        val params = rpc.params?.toAny() as? Map<String, Any?>
-                        val sid =
-                            (params?.get("session_id") as? String)
-                                ?: ((params?.get("payload") as? Map<*, *>)?.get("session_id") as? String)
-                        val seq = (params?.get("seq") as? Number)?.toInt()
+                        // Issue #1163: inspect scalars, not a throwaway copy of the whole params tree.
+                        val sid = rpc.params?.eventSessionId()
+                        val seq = ((rpc.params?.get("seq") as? JsonPrimitive)?.toAny() as? Number)?.toInt()
 
                         if (!sid.isNullOrBlank() && seq != null) {
                             val prev = lastSeenSeq[sid] ?: 0

app/src/main/java/com/m57/hermescontrol/data/ws/JsonRpcModels.kt

@@ -102,6 +102,13 @@ fun Any?.toJsonElement(): JsonElement =
         }
     }
 
+// Issue #1163: scalar conversion preserves toAny() type semantics without copying JSON containers.
+internal fun JsonElement?.eventStringOrNull(): String? = (this as? JsonPrimitive)?.toAny() as? String
+
+internal fun JsonObject.eventSessionId(): String? =
+    get("session_id").eventStringOrNull()
+        ?: (get("payload") as? JsonObject)?.get("session_id").eventStringOrNull()
+
 fun JsonElement.toAny(): Any? =
     when (this) {
         is JsonNull -> {