{
  "title": "Erhu Bare-Bones Starter Packet",
  "instrument": "erhu-inspired two-string vertical fiddle",
  "build_target": "qianjin-to-bridge setup-scale prototype",
  "artifact_focus": "L2 starter packet for qianjin-to-bridge measurement planning",
  "release_status": "L2 V5 build-packet candidate",
  "packet_version": "barebones-r3-starter",
  "family_members": [
    "erhu",
    "huqin",
    "spike fiddle",
    "bowed string"
  ],
  "cultural_provenance": {
    "claim": "This explorer indexes an erhu-inspired prototype packet for measurement planning. It does not claim measured erhu craft authority, reviewed full-instrument CAD, or validated acoustic performance."
  },
  "physical_design_anchors": {
    "dimension_basis": "qianjin-to-bridge speaking length",
    "nominal_mm": "400 mm",
    "setup_range_mm": "380-420 mm",
    "authority_scope": "setup strip only; body, bridge, membrane, string set, qianjin height, pegs, neck, and joinery remain TBD",
    "fabrication_authority": "cad/erhu-qianjin-scale-params.csv and drawings/erhu-qianjin-scale-starter.dxf only"
  },
  "release_gate": {
    "public_candidate": false,
    "required_before_public": [
      "Measure installed qianjin-to-bridge contact-point spans with photo evidence.",
      "Record bridge height, mass, foot geometry, placement, and bowed response.",
      "Record membrane material, tension method, humidity notes, and acoustic response.",
      "Record installed string source, gauge or product ID, open-string pitch, and tuner/audio evidence.",
      "Review resonator/body/neck/peg/joinery CAD or DXF before promoting any full-instrument fabrication geometry.",
      "Keep Wolfram/OpenSCAD notes source-only unless runtime commands and outputs are committed.",
      "Obtain erhu-specific measured reference, builder, teacher, or player review before public build guidance."
    ]
  },
  "engineering": {
    "authority_register": "visual-output-register.csv",
    "validation_gates": "validation.csv",
    "validation_loop": "validation-loop.csv",
    "qianjin_measurement_plan": "qianjin-measurement-plan.md",
    "resonator_authority_gates": "resonator-authority-gates.csv",
    "string_source_assumptions": "string-source-assumptions.csv",
    "mcp_provenance": "cad/mcp-session-log.md",
    "wolfram": []
  },
  "sources": [
    {
      "title": "Existing packet manifest",
      "credit": "Repo-local L2 packet metadata and authority boundary",
      "url": "manifest.json"
    },
    {
      "title": "Design notes",
      "credit": "Qianjin-to-bridge setup-scale design basis",
      "url": "design.md"
    },
    {
      "title": "Measurement plan",
      "credit": "Contact-point measurement protocol and anti-overclaim checks",
      "url": "qianjin-measurement-plan.md"
    }
  ]
}