feat(governance): queue stale km owner review

apps/api/src/models/governance.py

@@ -241,6 +241,33 @@ class KnowledgeStaleCandidatesResponse(BaseModel):
     generated_at: datetime
 
 
+class KnowledgeStaleOwnerReviewRequest(BaseModel):
+    owner: str = Field(default="operator_console", min_length=1, max_length=100)
+    owner_note: str | None = Field(default=None, max_length=240)
+    dry_run: bool = False
+
+
+class KnowledgeStaleOwnerReviewResponse(BaseModel):
+    schema_version: str = "km_stale_owner_review_v1"
+    entry_id: str
+    project_id: str
+    status: Literal["dry_run", "queued", "already_queued"]
+    governance_event_id: str | None = None
+    dispatch_id: str | None = None
+    workflow_stage: str
+    recommended_action: Literal[
+        "refresh_with_evidence",
+        "owner_review",
+        "archive_or_supersede",
+    ]
+    owner: str
+    owner_note: str | None = None
+    writes_km: bool = False
+    writes_governance_audit: bool
+    next_action: str = "owner_review_stale_km_candidate"
+    generated_at: datetime
+
+
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 # Endpoint 3: summary
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