feat: add governed nationwide AOI orchestration and CUDA enforcement

backend/app/schemas/coverage.py

@@ -65,9 +65,25 @@ class CoverageResolutionItem(BaseModel):
     status: CoverageStatus
     source_names: list[str]
     materialized_dataset_ids: list[UUID]
+    evidence: list["CoverageEvidenceItem"] = Field(default_factory=list)
     limitation_message: str
 
 
+class CoverageEvidenceItem(BaseModel):
+    dataset_id: UUID
+    source_name: str
+    authority_level: CoverageAuthority
+    source_version: str | None = None
+    observed_at: str | None = None
+    published_at: str | None = None
+    crs: str | None = None
+    resolution: dict | None = None
+    coverage_bbox_epsg4326: list[float] | None = None
+    attribution: str | None = None
+    license_note: str | None = None
+    checksum_sha256: str | None = None
+
+
 class CoverageResolveResponse(BaseModel):
     project_id: UUID
     bbox: CoverageBBox