feat(runtime): kompres hasil tool lewat squash sebelum masuk context

Salinan yang dikirim ke UI (TurnEvent::ToolResult) tetap utuh; hanya
salinan yang masuk riwayat percakapan (dikirim ke LLM) yang dikompres,
supaya user tetap melihat output tool apa adanya.

src/app/runtime/actions/mod.rs

@@ -1464,7 +1464,8 @@ fn run_agent_turn(
                     }
                 }
 
-                let tool_msg = ChatMessage::tool_result(tool_call.id.clone(), output);
+                let squashed_output = crate::app::runtime::context::squash::apply(&tool_name, &output);
+                let tool_msg = ChatMessage::tool_result(tool_call.id.clone(), squashed_output);
                 archive_message(tc.db.as_ref(), &tc.session_id, &tool_msg);
                 msgs.push(tool_msg);
             }