M8：天工阁、叩心与辰正——受托任务后台并行、叩心四约束、时态感知投影

- 天工阁域 domains/tiangong：backstage_tasks（委托包+验收标准+结果证据）；有限分解（parent 链）与受控并行（各自后台 Run）；子任务全终态级联父任务进入待验收；按证据 accept/reject
- kernel.start_backstage_run（kind=background_task）：loop 后台分支不占前台席位、与前台对话并行；断言放宽容纳无人物功能任务；结果只经回调回呈任务——无身份写入路径
- 叩心域 domains/kouxin：knocking_candidates（event/time_anchor/manual 触发 + 草稿 + 裁决快照）；四约束裁决（总开关→静默窗口【本地时区判定】→24h 频率→预算），dispatch 未过 429 且快照留痕；候选默认不自动发送；expire_stale 过期推进不触碰缘契
- 辰正 domains/zhengchen：temporal_context() 复用 time_sense 计算核（快照/农历/季节），产出【时态感知】投影段接入镜树生成 prompt（客观时间语境，不附情绪臆测——守一纪律）
- 退役：modules/goal_orchestrator|planner|perception|big_cycle、application/planning、services/governance|goal_persist、candidates 表链（imports 候选抽取 API 面）、goals/plans/agent_roster/perception_channels/big_cycles/旧候选表（迁移 009）；前端 admin goals/plans/agents/perception/world 页与六组件；governance 只留 GenerationPreferences；admin 治理面收敛为司命+百工两枢；pivots 健康以域表计数重建
- 验收（test_m8_tiangong 五用例）：后台任务无身份写入（记忆/魂籍/缘契零新增）；后台与前台并行；分解级联；叩心四约束逐项；不回应不降低关系（缘契维度/状态/版本零变化）
- 四套件：后端 345、前端 203、BFF 4、神识 5 包全绿（2 个预存环境失败不变）；迁移 009 净库干净

backend/app/kernel/loop.py

@@ -90,8 +90,12 @@ class KernelRunLoop:
         on_final: OnRunFinal | None = None,
         temperature: float | None = None,
         max_tokens: int | None = None,
+        background: bool = False,
     ) -> RunOutcome:
-        assert character_id or seat_key, "Run 必须绑定人物或提供席位键（试演）"
+        if background:
+            assert character_id or seat_key or run_id, "Run 需至少一个归属维度"
+        else:
+            assert character_id or seat_key, "Run 必须绑定人物或提供席位键（试演）"
         trace = trace_id or new_trace_id()
         outcome = RunOutcome()
         try:
@@ -107,6 +111,7 @@ class KernelRunLoop:
                     outcome=outcome,
                     temperature=temperature,
                     max_tokens=max_tokens,
+                    background=background,
                 )
         except TimeoutError:
             outcome.status = "interrupted"
@@ -137,6 +142,7 @@ class KernelRunLoop:
         outcome: RunOutcome,
         temperature: float | None = None,
         max_tokens: int | None = None,
+        background: bool = False,
     ) -> None:
         ctx = RunContext(run_id=run_id, character_id=character_id, trace_id=trace_id)
         try:
@@ -150,6 +156,22 @@ class KernelRunLoop:
             return
 
         await self._emit(run_id, character_id, trace_id, "run.queued")
+        if background:
+            # 天工阁受托任务：不占前台席位（与前台对话并行；不是第二意识）
+            await self._update_run(run_id, status="running")
+            await self._emit(run_id, character_id, trace_id, "run.started")
+            await self._turn(
+                run_id,
+                character_id,
+                owner_id,
+                trace_id,
+                prompt,
+                system_contract or _SYSTEM_CONTRACT_PLACEHOLDER,
+                outcome,
+                temperature=temperature,
+                max_tokens=max_tokens,
+            )
+            return
         async with self._seats.foreground(seat_key or character_id or run_id):
             await self._update_run(run_id, status="running")
             await self._emit(run_id, character_id, trace_id, "run.started")
@@ -176,6 +198,7 @@ class KernelRunLoop:
         outcome: RunOutcome,
         temperature: float | None = None,
         max_tokens: int | None = None,
+        background: bool = False,
     ) -> None:
         ctx = RunContext(
             run_id=run_id, character_id=character_id, trace_id=trace_id, payload={"prompt": prompt}