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    "planner": {
      "objective": "Plan a LIGHT review of the supplied manual inspection fixture using exactly the three supplied investigation nodes: fixture-question, fixture-dimensions and fixture-concept. Preserve the locked mechanical parameter contract. This is planning for a fictional teaching case, not engineering approval; CAD generation and measured geometry validation are later, separate operations.",
      "workerTasks": [
        {
          "id": "worker-a",
          "role": "gpt-6-luna — fit and manual motion",
          "instructions": "Review the locked coordinates and interfaces for the two guides, jaws, pads, bushings, lead screw, nut, supports and knob. Check the stated 78 mm nominal opening, proposed 60 mm travel, 1 mm base clearance and possible interference at travel limits by reasoning from supplied dimensions only. Distinguish constraints from assumptions about jaw direction, holes, fits, threads, friction and retention. Report conflicts without changing dimensions. Bound the contribution to the structural/support and manual-adjustment modules; do not create CAD or claim validated motion."
        },
        {
          "id": "worker-b",
          "role": "gpt-6-luna — assembly, BOM and proposed tests",
          "instructions": "Draft a compact proposed-parts BOM and a useful assembly/check flow diagram for the supplied base, rods, supports, jaws, pads, bushings, screw, nut, knob and four feet. Reconcile the target of 20 meaningful components without inventing a part or treating an inferred bushing allocation as locked. Identify unspecified fastening, retention and assembly interfaces as open questions. Propose non-destructive bench checks for access, positioning and manual adjustment, with no physical execution, measured results, holding-force claim or sample-damage test. Bound the contribution to assembly and proposed checks."
        }
      ],
      "integrationChecks": [
        "Use exactly the three supplied investigation nodes; organize the later LIGHT package into three modules with two stories each, without drafting that package now.",
        "Verify the opening arithmetic: jaw inner-face separation is 142 − (40 + 18) = 84 mm; two 3 mm inward-facing pads imply 78 mm. Flag pad placement as an assumption requiring later CAD review.",
        "Check travel direction against the supports: 60 mm of closing motion places the moving jaw at X82..100; 60 mm of opening motion places it at X202..220, overlapping the end-support X212..228 envelope. Do not silently redefine travel.",
        "Cross-check rod and screw axes against jaw and support envelopes, including the unspecified passages, bearing/retention interfaces and the screw-to-nut interaction. Treat simplified bores and threads as unvalidated.",
        "Reconcile BOM quantities with the 20-component target and the assembly sequence; explicitly flag any quantity or interface that the contract does not specify."
      ],
      "stopConditions": [
        "Stop and report any conflict that cannot be resolved without changing a locked parameter or inventing a part, hole, fastener, tolerance or motion feature.",
        "Do not generate CAD or source, report measured geometry, conduct physical tests, implement machine control, or claim a successful build, achieved repeatability, holding force or compliance.",
        "Stop at two bounded worker contributions and integration findings; leave the full LIGHT package and deterministic CAD validation for later operations."
      ]
    },
    "review": {
      "summary": "Integrated both worker reviews as one bounded LIGHT proposal. Their coordinate findings agree; neither review establishes a working mechanism.",
      "accepted": [
        "Accept both workers' 84 mm jaw-face arithmetic and conditional 78 mm inward-pad opening.",
        "Accept their explicit X202..220 versus X212..228 opening-end overlap of 8 mm, and their warning about the rod endpoint.",
        "Accept the named-part BOM as a provisional 20-instance reconciliation only when four bushings are inferred.",
        "Accept the proposed ordering of interface review before CAD review and any later physical check."
      ],
      "changed": [
        "Replace both workers' diagrams with one seven-node Mermaid flow. Its final node is a conditional check proposal, not an executed check.",
        "Keep four bushings visibly provisional in the BOM and geometry summary; the contract locks bushing dimensions but not quantity or placement.",
        "Treat the jaw-to-base 1 mm gap as a coordinate inference rather than validated maintained clearance."
      ],
      "rejected": [
        "Reject any interpretation that the proposed 60 mm opening motion is demonstrated usable.",
        "Reject treating nominal bore differences, a 20-part count or a proposed assembly order as proof of fit, retention, usefulness or manufacturing readiness.",
        "Reject implicit holes, threads, fasteners, bearing features or a geometry change as a silent solution."
      ],
      "unresolved": [
        "Opening-end interference, endpoint rod engagement, passages and fastening.",
        "Bushing allocation and fits; screw thread, thrust support, nut restraint and knob coupling.",
        "Loads, friction, motion protection, electrical integration and physical prototype validation."
      ],
      "nextAction": "Obtain explicit interface and travel decisions before separate CAD construction and geometric review; preserve the supplied contract until any proposed revision is reviewed openly."
    }
  },
  "limitations": [
    "Synthetic teaching inputs; dimensions supplied as design constraints.",
    "Mechanical JSON is a model-proposed design, pending separate builder validation.",
    "No physical testing, manufacturing release or product safety approval.",
    "The model split is implemented by this cookbook runner, not native TCE UI controls."
  ],
  "reproduction": "node scripts/cookbook-mechanical-examples.mjs --brief=scripts/cookbook-mechanical-brief.json --run --only=inspection-fixture"
}