How do I extract a graph from a finished branching work, what open graph data exists, and what choice-density measures have been used?

Partially verified: the curator re-read none of the cited sources; S6, S7, S5, S8, S9 rest on the producer's pinned reading. Three first-person web sources: a 2017 post gives an edge-per-instruction extraction recipe (look at each page once, write an edge, label endings, render with Graphviz) and notes interest in reconvergence and cycles; the Transverse Reading Gallery states it holds 834 network graphs for 2,569 books with DOT and TGF files and edge lists; Swinehart's project classifies pages as branching, story or ending and plots page-type shares across 12 books, reporting a decline in endings and choices over time (qualitative reading of charts; no numeric table in the text read). Together they give an extraction method, open graph files and choice-density framing. Curator qualifications: Partially verified: the curator re-read none of the cited sources; S6, S7, S5, S8, S9 rest on the producer's pinned reading. Curator GET 2026-10-23 of the sources not re-read (mechanical source evidence, not semantic verification): S6: HTTP 200, bytes equal to the producer pin; S7: HTTP 200, bytes equal to the producer pin; S5: HTTP 200, bytes equal to the producer pin; S8: HTTP 200, bytes equal to the producer pin; S9: HTTP 200, bytes equal to the producer pin. Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

{
  "citations": [
    {
      "url": "https://www.bamsoftware.com/hacks/chooseyourownadventure/index.html",
      "note": "candidate evidence excerpts"
    },
    {
      "url": "https://jeremydouglass.github.io/transverse-gallery/gallery.html",
      "note": "candidate evidence excerpts"
    },
    {
      "url": "https://samizdat.co/cyoa/",
      "note": "candidate evidence excerpts"
    },
    {
      "url": "https://jeremydouglass.github.io/transverse-gallery/gamebooks/01-39.html",
      "note": "candidate evidence excerpts"
    },
    {
      "url": "https://jeremydouglass.github.io/transverse-gallery/assets/gamebooks/graphviz/01-39%20CYOA%20--%20Inside%20UFO%2054-40.txt.gv",
      "note": "candidate evidence excerpts"
    }
  ]
}