Previous value: -nullNew value: +{
+  "additionalProperties": false,
+  "properties": {
+    "data": {
+      "additionalProperties": false,
+      "properties": {
+        "assumptions": {
+          "items": {
+            "maxLength": 500,
+            "type": "string"
+          },
+          "maxItems": 50,
+          "type": "array"
+        },
+        "durable": {
+          "type": "boolean"
+        },
+        "expires_at": {
+          "format": "date-time",
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "freshness_disclosure": {
+          "additionalProperties": false,
+          "properties": {
+            "by_rooftop": {
+              "additionalProperties": {
+                "additionalProperties": false,
+                "properties": {
+                  "last_ingest_at": {
+                    "format": "date-time",
+                    "maxLength": 40,
+                    "type": [
+                      "string",
+                      "null"
+                    ]
+                  },
+                  "status": {
+                    "enum": [
+                      "fresh",
+                      "stale",
+                      "no_data"
+                    ]
+                  }
+                },
+                "required": [
+                  "status",
+                  "last_ingest_at"
+                ],
+                "type": "object"
+              },
+              "maxProperties": 500,
+              "type": "object"
+            },
+            "generated_at": {
+              "format": "date-time",
+              "type": "string"
+            },
+            "inventory_last_seen_at": {
+              "format": "date-time",
+              "type": [
+                "string",
+                "null"
+              ]
+            }
+          },
+          "required": [
+            "generated_at",
+            "inventory_last_seen_at",
+            "by_rooftop"
+          ],
+          "type": "object"
+        },
+        "pricing": {
+          "additionalProperties": false,
+          "dependentRequired": {
+            "excluded": [
+              "pricing_coverage",
+              "pricing_disclosure"
+            ],
+            "pricing_coverage": [
+              "excluded",
+              "pricing_disclosure"
+            ],
+            "pricing_disclosure": [
+              "pricing_coverage",
+              "excluded"
+            ]
+          },
+          "properties": {
+            "base_price": {
+              "description": "Exact decimal amount with two places (never a JSON float).",
+              "pattern": "^-?[0-9]+\\.[0-9]{2}$",
+              "type": "string"
+            },
+            "currency": {
+              "const": "USD"
+            },
+            "excluded": {
+              "items": {
+                "additionalProperties": false,
+                "properties": {
+                  "code": {
+                    "enum": [
+                      "sales_tax",
+                      "title",
+                      "registration"
+                    ]
+                  },
+                  "label": {
+                    "maxLength": 40,
+                    "type": "string"
+                  },
+                  "reason": {
+                    "const": "varies_by_location"
+                  }
+                },
+                "required": [
+                  "code",
+                  "label",
+                  "reason"
+                ],
+                "type": "object"
+              },
+              "maxItems": 3,
+              "type": "array"
+            },
+            "fees_total": {
+              "description": "Exact decimal amount with two places (never a JSON float).",
+              "pattern": "^-?[0-9]+\\.[0-9]{2}$",
+              "type": "string"
+            },
+            "line_items": {
+              "items": {
+                "additionalProperties": false,
+                "properties": {
+                  "amount": {
+                    "description": "Exact decimal amount with two places (never a JSON float).",
+                    "pattern": "^-?[0-9]+\\.[0-9]{2}$",
+                    "type": "string"
+                  },
+                  "basis": {
+                    "enum": [
+                      "firm",
+                      "estimated"
+                    ]
+                  },
+                  "category": {
+                    "maxLength": 40,
+                    "type": "string"
+                  },
+                  "code": {
+                    "maxLength": 80,
+                    "type": "string"
+                  },
+                  "fee_type": {
+                    "enum": [
+                      "flat",
+                      "percent"
+                    ]
+                  },
+                  "included_in_price": {
+                    "type": "boolean"
+                  },
+                  "label": {
+                    "maxLength": 200,
+                    "type": "string"
+                  },
+                  "taxable": {
+                    "type": "boolean"
+                  }
+                },
+                "required": [
+                  "code",
+                  "label",
+                  "category",
+                  "fee_type",
+                  "amount",
+                  "taxable"
+                ],
+                "type": "object"
+              },
+              "maxItems": 100,
+              "type": "array"
+            },
+            "otd_total": {
+              "description": "Exact decimal amount with two places (never a JSON float).",
+              "pattern": "^-?[0-9]+\\.[0-9]{2}$",
+              "type": "string"
+            },
+            "pricing_coverage": {
+              "enum": [
+                "otd_estimate",
+                "partial_estimate"
+              ]
+            },
+            "pricing_disclosure": {
+              "maxLength": 500,
+              "type": "string"
+            },
+            "tax_total": {
+              "description": "Exact decimal amount with two places (never a JSON float).",
+              "pattern": "^-?[0-9]+\\.[0-9]{2}$",
+              "type": "string"
+            }
+          },
+          "required": [
+            "base_price",
+            "fees_total",
+            "tax_total",
+            "otd_total",
+            "currency",
+            "line_items"
+          ],
+          "type": "object"
+        },
+        "quote_id": {
+          "oneOf": [
+            {
+              "pattern": "^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$",
+              "type": "string"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "thread_id": {
+          "oneOf": [
+            {
+              "pattern": "^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$",
+              "type": "string"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "unit": {
+          "additionalProperties": false,
+          "properties": {
+            "condition": {
+              "enum": [
+                "new",
+                "used"
+              ]
+            },
+            "identity": {
+              "maxLength": 30,
+              "minLength": 5,
+              "type": "string"
+            },
+            "make": {
+              "maxLength": 80,
+              "type": "string"
+            },
+            "model": {
+              "maxLength": 80,
+              "type": "string"
+            },
+            "model_year": {
+              "maximum": 2100,
+              "minimum": 1950,
+              "type": "integer"
+            }
+          },
+          "required": [
+            "identity",
+            "condition",
+            "model_year",
+            "make",
+            "model"
+          ],
+          "type": "object"
+        }
+      },
+      "required": [
+        "durable",
+        "thread_id",
+        "quote_id",
+        "expires_at",
+        "unit",
+        "pricing",
+        "assumptions",
+        "freshness_disclosure"
+      ],
+      "type": "object"
+    },
+    "error": {
+      "additionalProperties": false,
+      "description": "Unknown and foreign thread ids are deliberately indistinguishable: both return invalid_params with message \"unknown thread_id\" (anti-enumeration).",
+      "properties": {
+        "auth_help_url": {
+          "description": "Present only when no credential was supplied for a capability that requires one. Points to human documentation for obtaining a key. Absent for invalid, pending, or disabled credentials, which are deliberately indistinguishable.",
+          "format": "uri",
+          "maxLength": 500,
+          "type": "string"
+        },
+        "code": {
+          "enum": [
+            "rooftop_not_found",
+            "rooftop_inactive",
+            "unit_not_found",
+            "invalid_params",
+            "rate_limited",
+            "upstream_unavailable",
+            "capability_unavailable",
+            "identity_required",
+            "quota_exceeded",
+            "unit_held",
+            "quote_expired",
+            "rooftop_paused",
+            "handoff_duplicate",
+            "idempotency_conflict",
+            "price_unavailable",
+            "snapshot_expired",
+            "artifact_too_large",
+            "cursor_invalid",
+            "cursor_expired",
+            "ambiguous_identity",
+            "unsupported_in_country"
+          ]
+        },
+        "message": {
+          "maxLength": 500,
+          "type": "string"
+        },
+        "retry_after_seconds": {
+          "minimum": 0,
+          "type": "integer"
+        },
+        "retryable": {
+          "type": "boolean"
+        }
+      },
+      "required": [
+        "code",
+        "message",
+        "retryable"
+      ],
+      "type": "object"
+    },
+    "freshness": {
+      "additionalProperties": false,
+      "properties": {
+        "by_rooftop": {
+          "additionalProperties": {
+            "additionalProperties": false,
+            "properties": {
+              "last_ingest_at": {
+                "format": "date-time",
+                "maxLength": 40,
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "status": {
+                "enum": [
+                  "fresh",
+                  "stale",
+                  "no_data"
+                ]
+              }
+            },
+            "required": [
+              "status",
+              "last_ingest_at"
+            ],
+            "type": "object"
+          },
+          "maxProperties": 500,
+          "type": "object"
+        }
+      },
+      "required": [
+        "by_rooftop"
+      ],
+      "type": "object"
+    }
+  },
+  "type": "object"
+}