复用 validate 返回的清单，去掉 wire 输入投影里重复的一次清单读取

- apps/ai-game-creator-shell/src-tauri/src/agent/direct_codex_user_item/wire.rs 的 direct_codex_user_item_to_wire_input 直接用 validate_direct_codex_user_item 返回的 manifest
- 原先 validate 之后再 read_manifest_for_project 一次，每次投影都会多读一次项目清单（并重复 seed task 变更），与 direct_codex_user_item_to_codex_turn_input 的口径也不一致
- cargo test user_item：24 passed；cargo check 通过（本机 stale target 需先 touch shared-contracts/src/lib.rs）

apps/ai-game-creator-shell/src-tauri/src/agent/direct_codex_user_item/wire.rs

@@ -3,8 +3,8 @@ use super::model::{
 };
 use super::validation::validate_direct_codex_user_item;
 use crate::agent::{
-    read_manifest_for_project, sanitize_attachment_local_path, sanitize_attachment_media_type,
-    sanitize_attachment_name, GameCreationAppManifest,
+    sanitize_attachment_local_path, sanitize_attachment_media_type, sanitize_attachment_name,
+    GameCreationAppManifest,
 };
 use serde_json::Value;
 use std::path::Path;
@@ -103,8 +103,8 @@ pub(crate) fn direct_codex_user_item_to_wire_input(
     root: &Path,
     item: &DirectCodexUserItem,
 ) -> Result<Value, String> {
-    validate_direct_codex_user_item(root, item)?;
-    let manifest = read_manifest_for_project(root)?;
+    // validate 已经读过清单并返回它，不要再读一次（seed task 变更也会被重复触发）。
+    let manifest = validate_direct_codex_user_item(root, item)?;
     let DirectCodexUserItem::Message(message) = item;
     let mut input = Vec::with_capacity(message.content.len());
     for part in &message.content {