feat(v2): T10 轨迹回放与会议结果复盘——只读轨迹、unmatched 单列、更正追加

覆盖 AC-22/32/33（BR-13/21/31/32、E-05/23/26）。

后端：
- contracts/trajectory.py：TrajectoryStep 与 ReviewOutcome。
  TrajectoryStep 失败必有错误码、成本未知时币种留空、observable() 给出
  可读字段白名单（机器可读地排除任何推理过程字段）；
  ReviewOutcome 只在 matched 且有明确映射口径时才有二元标签，附条件/撤回/
  未送审一律留空，unmatched 不得挂快照。
- services/trajectory.py：
  · project_steps 把既有 run 的步骤投影成轨迹（顺序即 sequence，部分完成
    如实标注，失败保留，成本缺省留空不填 0）；
  · replay 只读回放并按 sequence 稳定分页，不存在或跨项目抛 KeyError；
  · record 追加会议结果：未知快照记 unmatched，更正要指向本项目既有记录，
    链必须能终止；denominator 只数 matched 且有通过/否决口径的记录。
- api/prescreen.py：新增轨迹回放、会议结果列表与追加三个端点。

未做：轨迹写入仍由既有 DurableWorker.save_step 负责（本批不重做运行执行），
因此目前没有 judgment/rule 类步骤的产出方；会议标签映射（E-26）仍属 T11。

验证：backend 全量 unittest 494 项 OK（T09 时 469 项，无回归）。

Co-Authored-By: Claude Code <noreply@anthropic.com>

backend/api/prescreen.py

@@ -34,6 +34,7 @@ from api.project_assistant import enabled
 from api.risk_agent_access import authorize, check_project
 from contracts.prescreen import (
     EVIDENCE_MAX,
+    ID_MAX,
     MAX_BATCH_FILES,
     NOTE_MAX,
     ErrorCode,
@@ -41,7 +42,7 @@ from contracts.prescreen import (
     S1_ERROR_RETRYABLE,
 )
 from services import assistant_store as store
-from services import fact_conflict, material_import, prescreen_sandbox, prescreen_store
+from services import fact_conflict, material_import, prescreen_sandbox, prescreen_store, trajectory
 from services.assistant_settings import flags
 from services.fact_conflict import FactConflictUnresolved
 from services.project_assistant import ProjectAssistantService
@@ -91,6 +92,20 @@ class SimulationInput(Input):
     expected_revision: int | None = Field(default=None, ge=1)
 
 
+class OutcomeInput(Input):
+    """T10 会议结果。原始结果码必填；未提供时不得推断成通过或否决。"""
+
+    raw_code: str = Field(min_length=1, max_length=100)
+    meeting_id: str = Field(min_length=1, max_length=ID_MAX)
+    normalized: str | None = Field(default=None, max_length=40)
+    occurred_at: str | None = None
+    reviewed_snapshot_id: str | None = Field(default=None, max_length=ID_MAX)
+    supersedes_id: str | None = Field(default=None, max_length=ID_MAX)
+    mapping_ref: dict | None = None
+    conditions: list[str] = Field(default_factory=list, max_length=50)
+    evidence_ids: list[str] = Field(default_factory=list, max_length=EVIDENCE_MAX)
+
+
 # ---------------------------------------------------------------- 错误信封
 def _envelope(request: Request, code: ErrorCode, message: str) -> JSONResponse:
     request_id = request.headers.get("x-request-id") or store.uid("req")
@@ -452,3 +467,54 @@ def create_simulation(project_id: str, run_id: str, payload: SimulationInput,
         return result
 
     return run(request, action)
+
+
+# ---------------------------------------------------------------- 轨迹与会议结果（T10）
+@router.get("/projects/{project_id}/runs/{run_id}/trajectory")
+def get_trajectory(project_id: str, run_id: str, request: Request,
+                   cursor: str | None = None, limit: int = 50):
+    """只读轨迹回放。失败的步骤照常返回，不做美化过滤。"""
+    blocked = scope(request, project_id)
+    if blocked is not None:
+        return blocked
+
+    def action():
+        with _db() as db:
+            return trajectory.replay(db, project_id, run_id, cursor, _limit(limit))
+
+    return run(request, action)
+
+
+@router.get("/projects/{project_id}/review-outcomes")
+def list_review_outcomes(project_id: str, request: Request, status: str | None = None):
+    """会议结果列表。unmatched 单列，不混进已观察通过率的分母。"""
+    blocked = scope(request, project_id)
+    if blocked is not None:
+        return blocked
+    if status not in (None, "matched", "unmatched"):
+        return _envelope(request, ErrorCode.INVALID_REQUEST,
+                         "状态取值须为 matched 或 unmatched")
+
+    def action():
+        with _db() as db:
+            return trajectory.listing(db, project_id, status)
+
+    return run(request, action)
+
+
+@router.post("/projects/{project_id}/review-outcomes", status_code=201)
+def record_review_outcome(project_id: str, payload: OutcomeInput, request: Request):
+    """追加会议结果。找不到材料版本的一律记 unmatched；更正只能新增。"""
+    blocked = scope(request, project_id)
+    if blocked is not None:
+        return blocked
+
+    def action():
+        with _db() as db:
+            runs = store.listing(db, "run", project_id)
+            snapshots = [item.get("input_snapshot_id") for item in runs
+                         if item.get("input_snapshot_id")]
+            return trajectory.record(db, project_id, payload.model_dump(), _actor(request),
+                                     known_snapshots=snapshots)
+
+    return run(request, action)