feat(governance): surface km healthcheck dispatch

apps/api/src/models/governance.py

@@ -87,13 +87,22 @@ class DispatchItem(BaseModel):
     governance_event_id: str
     event_type: str
     dispatch_status: str
+    executor_type: str | None = None
     proposed_action: str = Field(description="≤120 字動作摘要")
     playbook_id: str | None = None
     playbook_trust: float | None = Field(default=None, ge=0.0, le=1.0)
     created_at: datetime
     dispatched_at: datetime | None = None
+    started_at: datetime | None = None
     completed_at: datetime | None = None
     operator_note: str | None = None
+    decision_path: str | None = None
+    workflow_stage: str | None = None
+    workflow_steps: list[str] = Field(default_factory=list)
+    next_action: str | None = None
+    lead_agent: str | None = None
+    support_agents: list[str] = Field(default_factory=list)
+    human_owner: str | None = None
 
 
 class GovernanceQueueResponse(BaseModel):