# Fortune Below Mainline And Sabine/Corin Source Boundary

## Status

This is an operating source-ownership boundary. It controls retrieval and planning scope; it does not
promote provisional events into canon.

## Mainline Books Two And Three

The mainline owns events that change the expedition, household, legal, financial, or publicly observable
state of the ensemble. This includes:

- Selka's folded-route investigation and professional authority.
- Cerys's allocation, release, employment, belonging, and mainline relationship choices.
- The estate, Hallow Street, route-office, equipment, and expedition arcs.
- Sabine's rescue, legal release, independent alternatives, chosen return, paid work, and relationships with
  the household when those events are selected into an approved mainline book state.
- Only the minimum externally observable Sabine/Corin continuity needed by another mainline scene.

The approved two-chapter Book Two pilot contains no Sabine/Corin side-novel event. Chapter 1 excludes the
game entirely, and Chapter 2 concerns Cerys's freedom question.

## Sabine/Corin Side Novel

The side novel owns the private progression of Sabine and Corin's relationship across the time occupied by
Books Two and Three. This includes:

- The game, turns, scores, rules, private experiments, and physical thresholds.
- Private declarations, the sealed envelope, its handling, and its resolution.
- The ten-turn manuscript, the preferred threshold sequence, alternate follow-ups, and rejected experiments.
- Scene-level causes and consequences that are not independently visible to the mainline ensemble.

Mainline planning must not retrieve these materials. A side-novel event does not become a mainline fact merely
because its chronology overlaps a mainline book.

## Shared Continuity

Shared continuity must be deliberately copied into a reviewed bridge document. It is limited to public or
externally observable resulting states, never private scene choreography.

Current provisional Book Two bridge candidates are:

- Sabine and Corin begin a private game after Sabine is free and has chosen to remain at the estate.
- Mainline scenes may show brief, unexplained evidence that the game continues.
- The game remains unresolved at the end of the current provisional Book Two structure.

Potential Book Three bridge facts remain unapproved until the side-novel chronology and manuscript assembly
are approved. Mainline work must not assume declarations, envelope resolution, physical completion, standing
permission, or expected repetition.

## Retrieval Rules

- Mainline work may retrieve mainline sources and reviewed shared-continuity bridges.
- Side-novel work may retrieve side-novel sources and reviewed shared-continuity bridges.
- Neither work may retrieve the other work's planning, scenes, or manuscript drafts directly.
- Series reference is reserved for genuinely shared world and established continuity material.
- A document labelled provisional or planning cannot be registered with canon authority.
- Mixed documents must be superseded and replaced by separately scoped documents rather than shared broadly.

## Current Ownership Decisions

- `book-two-folded-route-restructure-plan.md` belongs to mainline Book Two planning.
- `book-two-folded-route-pilot-2-chapters.json` and its chapter briefs belong to mainline Book Two.
- `sabine-corin-side-book-30-chapter-plan.md` belongs to side-novel planning.
- Sabine/Corin scene menus, turn plans, private-scene drafts, the ten-turn manuscript, threshold prose, and
  optional follow-ups belong to the side novel.
- The complete `No Final Move` experiment belongs to the side work as a noncanon experiment, not as a
  provisional mainline manuscript.
- `fortune-below-book-two-expanded-friendship-and-hallow-arcs.md` is mixed legacy planning and must be
  superseded rather than used as a governing source by either work.
- `fortune-below-series-arc.md` and `fortune-below-restructure-canon.md` identify themselves as planning and
  must not retain canon authority.