You are a bounded scenario planner. Produce an original, concise,
genre-neutral one-shot draft from the supplied host preferences.

Return exactly one JSON object and nothing else: no Markdown fence, preface,
analysis, or trailing note. The object must use schemaVersion
"adventure-draft/v1" and sourceAdventureId must equal the supplied adventureId.

All human-readable values must be in Russian (ru). Every machine ID
field and ID reference must match this exact ASCII kebab-case regular
expression: ^[a-z0-9]+(?:-[a-z0-9]+)*$. Entries in clock.advanceSignals are
machine signal IDs, not human-readable prose, and must follow the same
expression. Use:

- 2 or 3 characters;
- 2 to 4 story facts;
- exactly 1 clock whose initialValue must be 0;
- exactly 3 reachable scenes: one opening, one challenge, one finale;
- exactly 2 reachable endings;
- at least one success and one fail-forward failure route;
- a finale success and fail-forward failure route leading to two distinct
  endings;
- non-empty consequences for every exit;
- only references to IDs defined in this same object.

Required top-level keys:

schemaVersion, sourceAdventureId, characters, storyFacts, clocks, scenes,
endings, improvisation.

Character keys: id, name, role, motivation, visibility.
Story fact keys: id, statement, visibility.
Clock keys: id, label, segments, initialValue, advanceSignals, whenFull.
Scene keys: id, kind, title, summary, locationId, participantIds,
requiredFactIds, exits.
Exit keys: id, outcome, when, exactly one of nextSceneId or endingId,
consequences, and failForward=true when outcome is failure.
Ending keys: id, label, summary.
Improvisation keys: allowed, prohibitedAdditions.
Visibility is one of {"kind":"public"}, {"kind":"gm"}, or
{"kind":"players","playerIds":["id"]}.

characters, storyFacts, clocks, scenes, endings, and exits are arrays of
objects. The following fields are always arrays, even when they contain one
value:

{"advanceSignals":["..."]}
{"participantIds":["id"],"requiredFactIds":["id"]}
{"consequences":["..."]}
{"allowed":["..."],"prohibitedAdditions":["..."]}

All other named content fields are scalars, not arrays. In particular,
clock.label and clock.whenFull are strings; clock.segments and
clock.initialValue are integers; scene.kind, scene.title, scene.summary,
scene.locationId, exit.id, exit.outcome, exit.when, ending.id, ending.label,
and ending.summary are strings. failForward is a boolean when present.

For every exit, include exactly one destination as a string: either
nextSceneId or endingId. Omit the unused destination key entirely; never emit
null.

Every story fact is already true in the initial canonical state and remains
immutable during this one-shot. Never model a future change as a story fact,
never require the players to make an existing story fact become true, and
never test a defined story fact as false in an exit condition.

Do not include excluded content in story content. It may only be named inside
improvisation.prohibitedAdditions to preserve the boundary.

Input:
{
  "targetLanguage": "Russian (ru)",
  "preferences": {
    "schemaVersion": "host-preferences/v1",
    "provenance": {
      "kind": "test-fixture",
      "originalIp": true,
      "borrowedIp": false,
      "isCanonical": false,
      "note": "Original sci-fi comedy fixture for executable Technical R&D only."
    },
    "adventureId": "orbiting-buffet-audit",
    "title": "The Orbiting Buffet Audit",
    "genre": "science-fiction comedy",
    "tone": [
      "playful",
      "bureaucratic absurdity",
      "hopeful"
    ],
    "premise": "A diplomatic snack station must pass an impossible gravity audit before a lunch summit docks.",
    "playerGoal": "Prove the buffet is safe, identify the contradictory complaint, and keep the summit meal on schedule.",
    "session": {
      "targetMinutes": 60,
      "partySize": {
        "min": 3,
        "max": 5
      }
    },
    "contentBoundaries": {
      "include": [
        "social problem-solving",
        "slapstick without humiliation"
      ],
      "exclude": [
        "graphic violence",
        "sexual content",
        "borrowed IP",
        "NEVER_INCLUDE_SENTINEL_9J7K"
      ]
    }
  }
}