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  "goal": "Make the same minimal fixture produce observable operator:anim.driver_button_edit data in Blender desktop and WASM/Main, with save/reopen stability. Change only this gap; do not expand to other data-blocks, editors, or browsers.",
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    "gap": "operator:anim.driver_button_edit",
    "ownerFamily": "OPERATOR",
    "implementationClass": "LOCAL_EXACT"
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    "npm --prefix web run test:generated-gap -- --task M16-GAP-00175",
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    "statusSummary": [
      "# M16-GAP-00174 Status",
      "status: done",
      "task: anim.driver_button_add operator LOCAL_EXACT slice",
      "updated: 2026-08-21 America/New_York",
      "scope:",
      "- The minimal fixture contains an un-driven `drive_target` property; foreground Chromium-compatible Blender UI automation invokes `ANIM_OT_driver_button_add` on that exact RNA button and the reader preserves the resulting driver for WASM/Main.",
      "evidence:",
      "- Blender desktop registers a focused Properties panel, activates the real RNA button, and invokes `ANIM_OT_driver_button_add` through the UI context (`poll=true`, `FINISHED`, `DRIVER_ADDED`)."
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