{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://canon.coulomb.social/schemas/work-records/spine.schema.json",
  "title": "Work Record Spine (shared definitions)",
  "description": "Shared spine per canon/standards/work-record-types_v0.1.md. Kind schemas $ref these definitions. additionalProperties stays open: kind-specific fields extend the spine, never replace it.",
  "$defs": {
    "lane": {
      "enum": ["green", "blue", "yellow", "orange", "red"]
    },
    "uuid": {
      "type": "string",
      "pattern": "^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$"
    },
    "date": {
      "type": "string",
      "pattern": "^[0-9]{4}-[0-9]{2}-[0-9]{2}$"
    },
    "tags": {
      "type": "array",
      "items": { "type": "string", "pattern": "^[a-z0-9-]+$" }
    },
    "owner": {
      "type": "string",
      "minLength": 2
    },
    "spineOpen": {
      "type": "object",
      "description": "Spine requirements for records in a non-terminal status.",
      "required": ["id", "lane"],
      "properties": {
        "lane": { "$ref": "#/$defs/lane" },
        "owner": { "$ref": "#/$defs/owner" },
        "tags": { "$ref": "#/$defs/tags" },
        "uuid": { "$ref": "#/$defs/uuid" },
        "created_at": { "$ref": "#/$defs/date" }
      }
    }
  }
}