{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "whetstone/planning/project_backlog_schema_v1",
  "title": "Project Backlog Schema v1",
  "type": "object",
  "required": ["schema_version", "generated_at", "projects"],
  "properties": {
    "schema_version": { "const": "project_backlog_v1" },
    "generated_at": { "type": "string" },
    "projects": {
      "type": "array",
      "items": {
        "type": "object",
        "required": [
          "project_id",
          "project_name",
          "priority_tier",
          "personal_significance_tier",
          "execution_readiness",
          "domain_tags",
          "spec_path"
        ],
        "properties": {
          "project_id": { "type": "string" },
          "project_name": { "type": "string" },
          "priority_tier": {
            "type": "string",
            "enum": ["P0", "P1", "P2", "P3"]
          },
          "personal_significance_tier": {
            "type": "string",
            "enum": ["core_life_work", "high", "medium", "low"]
          },
          "execution_readiness": {
            "type": "string",
            "enum": ["spec_needed", "spec_draft", "spec_ready", "execution_ready", "done"]
          },
          "domain_tags": {
            "type": "array",
            "items": { "type": "string" }
          },
          "platform_tags": {
            "type": "array",
            "items": { "type": "string" }
          },
          "constraint_profile": {
            "type": "object",
            "properties": {
              "latency_ms_p95_max": { "type": ["number", "null"] },
              "throughput_target": { "type": ["string", "null"] },
              "hardware_target": { "type": ["string", "null"] },
              "availability_target": { "type": ["string", "null"] },
              "cost_ceiling_monthly_usd": { "type": ["number", "null"] }
            },
            "additionalProperties": false
          },
          "risk_level": {
            "type": "string",
            "enum": ["low", "medium", "high", "critical"]
          },
          "estimated_size": {
            "type": "string",
            "enum": ["XS", "S", "M", "L", "XL"]
          },
          "depends_on": {
            "type": "array",
            "items": { "type": "string" }
          },
          "spec_path": { "type": "string" },
          "notes": { "type": "string" }
        },
        "additionalProperties": false
      }
    }
  },
  "additionalProperties": false
}