feat(automation): expose no-write typed route preview

apps/api/src/api/v1/agents.py

@@ -383,6 +383,7 @@ from src.services.backup_notification_policy import (
 from src.services.backup_restore_drill_approval_package_template import (
     load_latest_backup_restore_drill_approval_package_template,
 )
+from src.services.controlled_alert_target_router import resolve_typed_alert_target
 from src.services.credential_escrow_evidence_intake_readiness import (
     load_latest_credential_escrow_evidence_intake_readiness,
     validate_credential_escrow_evidence_owner_response,
@@ -552,6 +553,17 @@ _PRIORITY_WORK_ORDER_LIVE_READBACK_TIMEOUT_SECONDS = 12.0
 # Request/Response Models
 # =============================================================================
 
+
+class ControlledAlertTargetPreviewRequest(BaseModel):
+    """只讀解析一筆告警的 canonical typed target。"""
+
+    alertname: str = Field(min_length=1, max_length=160)
+    target_resource: str = Field(default="", max_length=240)
+    namespace: str = Field(default="", max_length=160)
+    alert_category: str = Field(default="", max_length=120)
+    labels: dict[str, str] = Field(default_factory=dict)
+
+
 class AnalyzeRequest(BaseModel):
     """分析請求"""
     incident_id: str | None = Field(
@@ -1231,6 +1243,39 @@ async def get_sre_k3s_controlled_automation_work_items() -> dict[str, Any]:
         ) from exc
 
 
+@router.post(
+    "/controlled-alert-target-preview",
+    response_model=dict[str, Any],
+    summary="只讀預覽告警的 canonical typed route",
+    description=(
+        "以 production service registry 執行 deterministic target resolution，"
+        "只回傳經 LAN topology redaction 的 route。此端點不呼叫模型、不建立事件、"
+        "不 dispatch Agent99、不執行 Ansible/Kubernetes/DB 動作，也不更新完成狀態。"
+    ),
+)
+async def preview_controlled_alert_target(
+    payload: ControlledAlertTargetPreviewRequest,
+) -> dict[str, Any]:
+    """提供可重播、零 side effect 的 production typed-router verifier。"""
+
+    route = resolve_typed_alert_target(
+        alertname=payload.alertname,
+        target_resource=payload.target_resource,
+        namespace=payload.namespace,
+        labels=payload.labels,
+        alert_category=payload.alert_category,
+    )
+    return redact_public_lan_topology(
+        {
+            "schema_version": "controlled_alert_target_preview_v1",
+            "preview_only": True,
+            "dispatch_performed": False,
+            "runtime_closure_verified": False,
+            "route": route,
+        }
+    )
+
+
 @router.post(
     "/agent99/telegram-lifecycle",
     response_model=dict[str, Any],

apps/api/tests/test_sre_k3s_controlled_automation_work_items_api.py

@@ -122,3 +122,54 @@ def test_endpoint_returns_full_work_ledger() -> None:
     assert payload["agent99_host_operations_bridge"][
         "completion_callback"
     ] == "/api/v1/agents/agent99/completion-callback"
+
+
+def test_typed_target_preview_is_no_write_and_fail_closed() -> None:
+    app = FastAPI()
+    app.include_router(router, prefix="/api/v1")
+    client = TestClient(app)
+
+    unresolved = client.post(
+        "/api/v1/agents/controlled-alert-target-preview",
+        json={
+            "alertname": "VMwareGuestHealthDegraded",
+            "target_resource": "unregistered-vmware-guest",
+            "namespace": "virtualization",
+            "labels": {},
+            "alert_category": "infrastructure",
+        },
+    )
+    agent99 = client.post(
+        "/api/v1/agents/controlled-alert-target-preview",
+        json={
+            "alertname": "Agent99ServiceUnhealthy",
+            "target_resource": "agent99",
+            "namespace": "control-plane",
+            "labels": {},
+            "alert_category": "infrastructure",
+        },
+    )
+
+    assert unresolved.status_code == 200
+    unresolved_payload = unresolved.json()
+    assert unresolved_payload["preview_only"] is True
+    assert unresolved_payload["dispatch_performed"] is False
+    assert unresolved_payload["runtime_closure_verified"] is False
+    assert unresolved_payload["route"]["resolution_status"] == (
+        "asset_identity_unresolved"
+    )
+    assert unresolved_payload["route"]["executor"] is None
+    assert unresolved_payload["route"]["agent99_bridge"][
+        "dispatch_allowed"
+    ] is False
+
+    assert agent99.status_code == 200
+    agent99_payload = agent99.json()
+    assert agent99_payload["dispatch_performed"] is False
+    assert agent99_payload["route"]["canonical_asset_id"] == (
+        "windows-vmware:host_99"
+    )
+    assert agent99_payload["route"]["executor"] == "Agent99"
+    assert agent99_payload["route"]["agent99_bridge"][
+        "dispatch_allowed"
+    ] is True