feat(governance): preview stale km completion batches

apps/api/src/models/governance.py

@@ -465,6 +465,15 @@ class KnowledgeStaleOwnerReviewCompletionQueueResponse(BaseModel):
     schema_version: str = "km_stale_owner_review_completion_queue_v1"
     project_id: str
     status_bucket: Literal["all", "ready", "blocked", "completed", "failed", "pending"]
+    priority_tiers: list[str] = Field(default_factory=list)
+    recommended_completion_outcome: Literal[
+        "all",
+        "refresh_with_evidence",
+        "archive",
+        "supersede",
+    ] = "all"
+    batch_governance_event_id: str | None = None
+    can_preview: bool | None = None
     total: int
     returned: int
     pending_count: int
@@ -479,6 +488,57 @@ class KnowledgeStaleOwnerReviewCompletionQueueResponse(BaseModel):
     generated_at: datetime
 
 
+class KnowledgeStaleOwnerReviewCompletionBatchPreviewRequest(BaseModel):
+    project_id: str = Field(default="awoooi", min_length=1, max_length=64)
+    status_bucket: Literal["all", "ready", "blocked", "completed", "failed", "pending"] = "ready"
+    priority_tiers: list[Literal["P0", "P1", "P2"]] = Field(
+        default_factory=lambda: ["P0", "P1", "P2"],
+        min_length=1,
+        max_length=3,
+    )
+    recommended_completion_outcome: Literal[
+        "all",
+        "refresh_with_evidence",
+        "archive",
+        "supersede",
+    ] = "all"
+    batch_governance_event_id: str | None = Field(default=None, max_length=120)
+    limit: int = Field(default=10, ge=1, le=30)
+    owner: str = Field(default="operator_console", min_length=1, max_length=100)
+    owner_note: str | None = Field(default=None, max_length=240)
+
+
+class KnowledgeStaleOwnerReviewCompletionBatchPreviewResponse(BaseModel):
+    schema_version: str = "km_stale_owner_review_completion_batch_preview_v1"
+    project_id: str
+    status: Literal["dry_run"] = "dry_run"
+    owner: str
+    owner_note: str | None = None
+    status_bucket: Literal["all", "ready", "blocked", "completed", "failed", "pending"]
+    priority_tiers: list[str]
+    recommended_completion_outcome: Literal[
+        "all",
+        "refresh_with_evidence",
+        "archive",
+        "supersede",
+    ]
+    batch_governance_event_id: str | None = None
+    requested_limit: int
+    candidate_count: int
+    previewable_count: int
+    blocked_count: int
+    completed_count: int
+    failed_count: int
+    writes_km: bool = False
+    writes_governance_audit: bool = False
+    batch_writes_allowed: bool = False
+    manual_review_required: bool = True
+    dry_run_plan_fingerprint: str
+    next_action: str = "preview_each_ready_item_then_confirm_single_item"
+    items: list[KnowledgeStaleOwnerReviewCompletionQueueItem] = Field(default_factory=list)
+    generated_at: datetime
+
+
 class KnowledgeStaleOwnerReviewCompleteRequest(BaseModel):
     dispatch_id: str | None = Field(
         default=None,