fix(core): clarify hook microcompaction comment

Author: qqqys

packages/core/src/core/client.ts

@@ -1607,9 +1607,8 @@ export class GeminiClient {
         messageType === SendMessageType.Cron
       ) {
         // Idle cleanup: clear old tool results when idle > threshold.
-        // Runs on user and cron messages, not tool result submissions
-        // or retries/hooks, so model latency during a tool-call loop
-        // does not count as user idle time.
+        // Runs on user and cron messages. ToolResult and Retry are
+        // excluded; Hook continuations use a separate checkpoint below.
         await this.microcompactIdleHistory(this.lastApiCompletionTimestamp);
         this.lastHookMicrocompactionTimestamp = Date.now();
       } else if (messageType === SendMessageType.Hook) {