重构: String→newtype 强类型 + 工程清理

- df-types: ExecutionId/ToolCallType 从 type 别名改为 newtype 结构体
- df-ai-core: 新增 ToolType newtype / MessageStatus 枚举,
  ChatMessage.status 从 Option<String> 改为 Option<MessageStatus>
- provider: is_active() 改用 MessageStatus::Active 模式匹配
- context/chat/conversation: 构造站点更新为枚举变体
- .gitignore: 添加分析脚本排除项,清理根目录临时文件
- Batch.md: 更新最新提交与新增 Batch 37 记录

crates/df-ai/src/context/manager_tests.rs

@@ -186,7 +186,7 @@ fn push_token_only_active() {
     let active_msg = ChatMessage::user("这条是 active 的");
     let active_tokens = TokenEstimator::default().estimate_message(&active_msg);
     let mut inactive_msg = ChatMessage::assistant("这条被截断了不该计 token");
-    inactive_msg.status = Some("truncated".to_string());
+    inactive_msg.status = Some(MessageStatus::Truncated);
     let inactive_tokens = TokenEstimator::default().estimate_message(&inactive_msg);
 
     mgr.push(active_msg);
@@ -210,11 +210,11 @@ fn push_token_only_active() {
     // 2) restore_from_messages 路径（调 push，token 同步仅 active）
     let mut mgr2 = ContextManager::new(cfg(100_000));
     let mut a = ChatMessage::user("active 一");
-    a.status = Some("active".to_string());
+    a.status = Some(MessageStatus::Active);
     let mut b = ChatMessage::user("archived 一");
-    b.status = Some("archived_segment".to_string());
+    b.status = Some(MessageStatus::ArchivedSegment);
     let mut c = ChatMessage::user("compressed 一");
-    c.status = Some("compressed".to_string());
+    c.status = Some(MessageStatus::Compressed);
     mgr2.restore_from_messages(vec![a, b, c]);
 
     assert_eq!(mgr2.len(), 3, "restore 后全量保留三条");
@@ -330,7 +330,7 @@ fn compress_old_messages_skips_already_inactive() {
     // 范围内含 truncated(已 !active)的消息:跳过,不返,不重复扣 token。
     let mut mgr = ContextManager::new(cfg(100_000));
     let mut truncated = ChatMessage::user("被截断");
-    truncated.status = Some("truncated".to_string());
+    truncated.status = Some(MessageStatus::Truncated);
     mgr.push(truncated);
     mgr.push(ChatMessage::user("active 一条"));
     let tokens_before = mgr.history_tokens();
@@ -397,7 +397,7 @@ fn insert_at_adds_to_budget_when_active() {
     // 插入 !active 消息 → 不计入 token
     let tokens_before_inactive = mgr.history_tokens();
     let mut inactive = ChatMessage::user("x");
-    inactive.status = Some("truncated".to_string());
+    inactive.status = Some(MessageStatus::Truncated);
     mgr.insert_at(0, inactive);
     assert_eq!(
         mgr.history_tokens(),

crates/df-ai/src/context/mod.rs

@@ -31,7 +31,7 @@ pub use crate::context_helpers::{
     EvictionUnit, ContextConfig, MessageGroup, TokenEstimator, TrackedMessage,
 };
 
-use crate::provider::{ChatMessage, MessageRole};
+use crate::provider::{ChatMessage, MessageRole, MessageStatus};
 
 // ============================================================
 // 上下文管理器
@@ -321,7 +321,7 @@ impl ContextManager {
         let mut count = 0usize;
         for t in self.messages[i + 1..].iter_mut() {
             if t.message.is_active() {
-                t.message.status = Some("truncated".to_string());
+                t.message.status = Some(MessageStatus::Truncated);
                 count += 1;
             }
         }
@@ -513,7 +513,7 @@ impl ContextManager {
         for t in self.messages[..end].iter_mut() {
             if t.message.is_active() {
                 newly_compressed.push(t.message.clone());
-                t.message.status = Some("compressed".to_string());
+                t.message.status = Some(MessageStatus::Compressed);
                 self.history_tokens = self.history_tokens.saturating_sub(t.token_count);
             }
         }