Direct 回合在 begin 之后补分段 trace

新增 direct_turn_trace：按 stage 写应用日志，定位回合在 begin 与执行器之间停在哪一步
覆盖 session-ready / run-analytics-accepted / goal-analytics-accepted / system-prompt-ready / executor-dispatch
仅在 cfg(not(test)) 生效，不污染用例与本机 AppData

apps/ai-game-creator-shell/src-tauri/src/agent/direct_runtime/mod.rs

@@ -4294,6 +4294,24 @@ pub(crate) fn check_direct_turn_preconditions(
         .map_err(|detail| DirectTurnError::InputRejected { detail })?;
     Ok(())
 }
+/// Direct 回合在 `direct_execution::begin` 之后的分段 trace。
+///
+/// 起因：2026-10-02 连续四轮回合都停在 `begin` 之后——账本 `phase=working`、
+/// `nextSequence=0`、`active={}`、没有任何错误 sidecar、stderr 无 panic、连
+/// `agent.direct_codex.*` 都没有。窗口就夹在 `begin` 与执行器调用之间，需要知道
+/// 具体停在哪一步。测试态不写，避免污染本机 AppData。
+#[cfg(not(test))]
+fn direct_turn_trace(stage: &str) {
+    let _ = crate::append_application_log(
+        "info".to_string(),
+        "direct-turn".to_string(),
+        format!("agent.direct_turn.trace stage={stage}"),
+    );
+}
+
+#[cfg(test)]
+fn direct_turn_trace(_stage: &str) {}
+
 pub(crate) async fn run_direct_game_creator_turn_at_with_creation_type_and_emitter(
     root: &Path,
     prompt: &str,
@@ -4401,6 +4419,7 @@ async fn run_direct_game_creator_turn_inner(
     })?;
     let execution_session = execution_guard.session();
     execution_session.set_analytics_capture(capture.clone());
+    direct_turn_trace("session-ready");
     let started = execution_session
         .newly_accepted
         .then(std::time::Instant::now);
@@ -4411,6 +4430,7 @@ async fn run_direct_game_creator_turn_inner(
             }
         }
     }
+    direct_turn_trace("run-analytics-accepted");
     // 在 guard 仍存活时冻结整体结果，避免 Drop 的中断收尾覆盖真实失败原因。
     let result: Result<String, DirectTurnError> = async {
         if let Some(report) = super::direct_delivery::terminal_report(&execution_session) {
@@ -4444,6 +4464,7 @@ async fn run_direct_game_creator_turn_inner(
                 );
             }
         }
+        direct_turn_trace("goal-analytics-accepted");
         emit_direct_game_creator_progress(root, "codex.turn", "陶泥儿正在处理这条消息");
         if let Some(emitter) = turn_emitter {
             emitter.emit("running", Some("preparing"));
@@ -4460,6 +4481,7 @@ async fn run_direct_game_creator_turn_inner(
                     DirectTurnError::turn_failed(DirectCodexFailureStage::CodeGeneration, error)
                 },
             )?;
+        direct_turn_trace("system-prompt-ready");
         // 三维请求：把"自选三维技术栈、解除 Phaser 固定约束"的合同放在系统提示最前，
         // 避免被长度上限截断，也不阻断任何工具。
         let engine_contract = direct_engine_three_dimensional_contract(root, prompt);
@@ -4471,6 +4493,7 @@ async fn run_direct_game_creator_turn_inner(
             None => base_system_prompt,
         };
         let reply = if let Some(emitter) = turn_emitter {
+            direct_turn_trace("executor-dispatch");
             let client_turn_id = emitter.turn_id().to_string();
             let emitter = emitter.clone();
             let mut observer = |observation: DirectCodexTurnObservation| {