新增: 知识图谱Phase2事件流(父⑥) — project_events统一事件流+埋点+timeline

父⑥ Phase 2(对标设计 §2.4):
- V30 迁移:project_events 追加型审计表(id/project_id/event_type/entity_type/entity_id/from_state/to_state/context_json/source/conversation_id/created_at)+ 双索引(project,time / entity)
- ProjectEventRecord + ProjectEventRepo(insert 追加型/get_by_project/get_by_entity/list_recent)
- 事件埋点(best-effort,hook/after,失败 warn 不阻断主操作):
  - task.rs emit_event 辅助 + create_task/advance_task/move_task_queue 埋点
  - idea.rs promote_idea 埋点(idea_promoted,project_id=新项目)
  - project.rs create/delete 埋点
  - 注:idea_created 暂不埋点(idea 无 project_id,待 Inbox 项目落地,NOT NULL+FK 约束)
- get_project_timeline IPC(events 模块)+ lib.rs 注册 + AI 工具(基线 +N)
- source 语义:IPC 标 human,AI 工具路径标 ai

注:workflow 脚本中文变量名 const 致验证 agent 未跑,主控独立 cargo check EXIT 0 + grep 落地齐全核验。

src-tauri/src/commands/task.rs

@@ -5,12 +5,56 @@ use tauri::State;
 
 use df_types::types::{new_id, TaskStatus};
 use df_storage::crud::TaskQuery;
-use df_storage::models::{TaskLinkRecord, TaskRecord};
+use df_storage::models::{ProjectEventRecord, TaskLinkRecord, TaskRecord};
 
 use crate::state::AppState;
 
 use super::{err_str, now_millis};
 
+// ============================================================
+// 知识图谱 Phase 2:事件流埋点辅助(best-effort,对标设计 §2.4 hook/after + §10.1)
+// ============================================================
+
+/// 追加一条项目事件到 project_events(best-effort)。
+///
+/// 埋点策略(设计 §2.4):事件写入失败**不阻断主操作**,仅 `tracing::warn` 记录。
+/// 设计 §10.1「事件流写入失败 — 影响事件完整性 — 事件写入失败不阻断主操作(best-effort)」。
+///
+/// `source` 语义:本辅助仅由 IPC 层调用,标 `"human"`(AI 工具路径在 tool_registry 内自行标
+/// `"ai"`,不经本 IPC)。`project_id` / `entity_type` / `entity_id` / `event_type` 由调用方
+/// 提供。`from_state` / `to_state` / `context_json` 可选。
+async fn emit_event(
+    state: &State<'_, AppState>,
+    project_id: &str,
+    event_type: &str,
+    entity_type: Option<&str>,
+    entity_id: Option<&str>,
+    from_state: Option<&str>,
+    to_state: Option<&str>,
+) {
+    let record = ProjectEventRecord {
+        id: new_id(),
+        project_id: project_id.to_string(),
+        event_type: event_type.to_string(),
+        entity_type: entity_type.map(|s| s.to_string()),
+        entity_id: entity_id.map(|s| s.to_string()),
+        from_state: from_state.map(|s| s.to_string()),
+        to_state: to_state.map(|s| s.to_string()),
+        context_json: None,
+        source: Some("human".to_string()),
+        conversation_id: None,
+        created_at: now_millis(),
+    };
+    if let Err(e) = state.project_events.insert(record).await {
+        tracing::warn!(
+            event_type = event_type,
+            project_id = project_id,
+            error = %e,
+            "[事件流] 埋点写入失败(不阻断主操作)"
+        );
+    }
+}
+
 /// 创建任务入参
 #[derive(Debug, Deserialize)]
 pub struct CreateTaskInput {
@@ -262,6 +306,17 @@ pub async fn create_task(
         .insert(record.clone())
         .await
         .map_err(err_str)?;
+    // 知识图谱 Phase 2(对标设计 §2.4 hook/after):task_created 事件。best-effort 不阻断。
+    emit_event(
+        &state,
+        &record.project_id,
+        "task_created",
+        Some("task"),
+        Some(&record.id),
+        None,
+        Some(&record.status),
+    )
+    .await;
     Ok(record)
 }
 
@@ -372,6 +427,15 @@ pub async fn advance_task(
     id: String,
     target_status: String,
 ) -> Result<TaskRecord, String> {
+    // 知识图谱 Phase 2:推进前读当前态,作 task_advanced 事件 from_state(仅一次轻量读,
+    // advance 低频无压力)。失败(任务不存在)不阻断——后续 atomic 会用 NotFound 拒绝,from 留空。
+    let from_state = state
+        .tasks
+        .get_by_id(&id)
+        .await
+        .map_err(err_str)?
+        .map(|t| t.status);
+
     let updated = df_nodes::task_advance_node::advance_task_atomic(
         &state.tasks,
         &id,
@@ -394,6 +458,19 @@ pub async fn advance_task(
             );
         }
     }
+
+    // 知识图谱 Phase 2(对标设计 §2.4 hook/after):task_advanced 事件。best-effort 不阻断。
+    emit_event(
+        &state,
+        &updated.project_id,
+        "task_advanced",
+        Some("task"),
+        Some(&updated.id),
+        from_state.as_deref(),
+        Some(&updated.status),
+    )
+    .await;
+
     Ok(updated)
 }
 
@@ -639,6 +716,21 @@ pub async fn move_task_queue(
             .map_err(err_str)?;
     }
 
+    // 知识图谱 Phase 2(对标设计 §2.4 hook/after):queue 变化事件。best-effort 不阻断。
+    // 仅在 queue 实际变化时埋点(避免 no-op 移动产噪音事件)。from/to 用 queue 值。
+    if current.queue != new_queue {
+        emit_event(
+            &state,
+            &current.project_id,
+            "task_advanced",
+            Some("task"),
+            Some(&current.id),
+            Some(&current.queue),
+            Some(&new_queue),
+        )
+        .await;
+    }
+
     // 回读最新记录返回
     state
         .tasks