[
  {
    "id": "F001",
    "description": "Add nested `Design` and `Preview` tabs inside `Visual` mode in `InvoiceTemplateEditor`",
    "implemented": true,
    "prdRefs": [
      "UX / UI Notes",
      "Functional Requirements"
    ]
  },
  {
    "id": "F002",
    "description": "Preserve existing top-level `Visual` and `Code` editor behavior while adding preview workflow",
    "implemented": true,
    "prdRefs": [
      "UX / UI Notes",
      "Functional Requirements"
    ]
  },
  {
    "id": "F003",
    "description": "Add preview session state model including compile/render/verify lifecycle statuses",
    "implemented": true,
    "prdRefs": [
      "Functional Requirements"
    ]
  },
  {
    "id": "F004",
    "description": "Support preview data source toggle between `Sample` and `Existing`",
    "implemented": true,
    "prdRefs": [
      "Functional Requirements",
      "Users and Primary Flows"
    ]
  },
  {
    "id": "F005",
    "description": "Provide curated sample invoice scenarios for preview without requiring existing invoices",
    "implemented": true,
    "prdRefs": [
      "Functional Requirements",
      "Users and Primary Flows"
    ]
  },
  {
    "id": "F006",
    "description": "Implement existing-invoice searchable selector backed by tenant-scoped invoice queries",
    "implemented": true,
    "prdRefs": [
      "Functional Requirements",
      "Data / API / Integrations"
    ]
  },
  {
    "id": "F007",
    "description": "Fetch selected existing invoice details and normalize to renderer input model",
    "implemented": true,
    "prdRefs": [
      "Functional Requirements",
      "Data / API / Integrations"
    ]
  },
  {
    "id": "F008",
    "description": "Introduce GUI designer IR extraction from workspace nodes as compiler input",
    "implemented": true,
    "prdRefs": [
      "Functional Requirements"
    ]
  },
  {
    "id": "F009",
    "description": "Implement deterministic AssemblyScript code generation from GUI IR",
    "implemented": true,
    "prdRefs": [
      "Functional Requirements"
    ]
  },
  {
    "id": "F010",
    "description": "Generate field/table/totals binding logic in AssemblyScript output from GUI metadata",
    "implemented": true,
    "prdRefs": [
      "Functional Requirements"
    ]
  },
  {
    "id": "F011",
    "description": "Generate layout/style logic in AssemblyScript output from GUI layout constraints",
    "implemented": true,
    "prdRefs": [
      "Functional Requirements"
    ]
  },
  {
    "id": "F012",
    "description": "Emit compiler source maps/diagnostics metadata linking GUI nodes to generated AssemblyScript segments",
    "implemented": true,
    "prdRefs": [
      "Functional Requirements"
    ]
  },
  {
    "id": "F013",
    "description": "Add transient compile action for preview that uses same AssemblyScript compiler options/path as production template compilation",
    "implemented": true,
    "prdRefs": [
      "Functional Requirements",
      "Data / API / Integrations"
    ]
  },
  {
    "id": "F014",
    "description": "Implement compile cache keyed by generated source hash to avoid redundant compilation",
    "implemented": true,
    "prdRefs": [
      "Non-functional Requirements"
    ]
  },
  {
    "id": "F015",
    "description": "Surface structured compile errors and warnings in preview UI",
    "implemented": true,
    "prdRefs": [
      "Functional Requirements",
      "Non-functional Requirements"
    ]
  },
  {
    "id": "F016",
    "description": "Ensure preview compile path is side-effect free and does not write templates/invoices",
    "implemented": true,
    "prdRefs": [
      "Functional Requirements",
      "Security / Permissions"
    ]
  },
  {
    "id": "F017",
    "description": "Render preview via real invoice rendering runtime (Wasm execution + HTML/CSS render path)",
    "implemented": true,
    "prdRefs": [
      "Summary",
      "Functional Requirements"
    ]
  },
  {
    "id": "F018",
    "description": "Disallow designer-canvas placeholder renderer as authoritative preview output",
    "implemented": true,
    "prdRefs": [
      "Summary",
      "Functional Requirements"
    ]
  },
  {
    "id": "F019",
    "description": "Debounce preview compile+render pipeline while editing",
    "implemented": true,
    "prdRefs": [
      "Functional Requirements",
      "Non-functional Requirements"
    ]
  },
  {
    "id": "F020",
    "description": "Add manual re-run action for compile/render/verification in preview",
    "implemented": true,
    "prdRefs": [
      "Open Questions",
      "UX / UI Notes"
    ]
  },
  {
    "id": "F021",
    "description": "Implement loading, empty, and error UI states for data load, compile, render, and verification phases",
    "implemented": true,
    "prdRefs": [
      "UX / UI Notes",
      "Non-functional Requirements"
    ]
  },
  {
    "id": "F022",
    "description": "Keep preview read-only with no drag/drop/resize/selection mutations",
    "implemented": true,
    "prdRefs": [
      "Functional Requirements",
      "Goals"
    ]
  },
  {
    "id": "F023",
    "description": "Derive expected layout constraints from GUI design state for verification",
    "implemented": true,
    "prdRefs": [
      "Functional Requirements"
    ]
  },
  {
    "id": "F024",
    "description": "Collect rendered HTML layout geometry from authoritative preview output",
    "implemented": true,
    "prdRefs": [
      "Functional Requirements"
    ]
  },
  {
    "id": "F025",
    "description": "Implement layout comparator with tolerance rules to detect mismatches between expected design constraints and rendered geometry",
    "implemented": true,
    "prdRefs": [
      "Functional Requirements",
      "Open Questions"
    ]
  },
  {
    "id": "F026",
    "description": "Display verification summary and mismatch details within preview UI",
    "implemented": true,
    "prdRefs": [
      "UX / UI Notes",
      "Functional Requirements"
    ]
  },
  {
    "id": "F027",
    "description": "Expose explicit preview verification status (pass/issues) for current design+data selection",
    "implemented": true,
    "prdRefs": [
      "UX / UI Notes",
      "Acceptance Criteria (Definition of Done)"
    ]
  },
  {
    "id": "F028",
    "description": "Ensure save flow persists compiler-generated AssemblyScript/Wasm logic used by preview",
    "implemented": true,
    "prdRefs": [
      "Functional Requirements",
      "Acceptance Criteria (Definition of Done)"
    ]
  },
  {
    "id": "F029",
    "description": "Define and enforce GUI vs Code source-of-truth behavior for GUI-authored templates",
    "implemented": true,
    "prdRefs": [
      "Open Questions",
      "Functional Requirements"
    ]
  },
  {
    "id": "F030",
    "description": "Preserve designer workspace hydration/reset and unsaved state while running authoritative preview",
    "implemented": true,
    "prdRefs": [
      "Rollout / Migration",
      "Functional Requirements"
    ]
  },
  {
    "id": "F031",
    "description": "Add stable automation IDs for preview controls, status indicators, and verification report elements",
    "implemented": true,
    "prdRefs": [
      "Functional Requirements"
    ]
  },
  {
    "id": "F032",
    "description": "Add unit tests for IR extraction and deterministic AssemblyScript code generation",
    "implemented": true,
    "prdRefs": [
      "Acceptance Criteria (Definition of Done)"
    ]
  },
  {
    "id": "F033",
    "description": "Add integration tests for preview compile+render parity with real invoice rendering runtime",
    "implemented": true,
    "prdRefs": [
      "Acceptance Criteria (Definition of Done)"
    ]
  },
  {
    "id": "F034",
    "description": "Add verification tests for layout comparator pass/fail behavior across known design fixtures",
    "implemented": true,
    "prdRefs": [
      "Acceptance Criteria (Definition of Done)"
    ]
  },
  {
    "id": "F035",
    "description": "Add end-to-end tests for design -> preview -> verify -> save flow",
    "implemented": true,
    "prdRefs": [
      "Users and Primary Flows",
      "Acceptance Criteria (Definition of Done)"
    ]
  },
  {
    "id": "F036",
    "description": "Update billing template documentation to describe authoritative preview compiler pipeline and layout verification behavior",
    "implemented": true,
    "prdRefs": [
      "Acceptance Criteria (Definition of Done)"
    ]
  }
]