Presentation Packs

Presentation belongs to the viewer, not the Simfile schema. The same run can be arranged as a compact glyph map, office floor, abstract organization map, or another visual surface without changing one world fact.

The current viewer ships a small built-in skin list and deterministic auto-layout. Rooms, agents, variables, and membranes are keyed by stable artifact IDs; no schema field sets colors, models, camera positions, or embodiment.

This boundary protects two properties:

• a run with no presentation pack still renders;
• changing presentation cannot change the clock, rules, causal record, observation result, or replay.

The renderer may derive layout and synthesize visual anchors, for example, a team:<id> node next to its representative when a mind membrane is present. Those are labeled presentation choices, not ledger events.

There is no simfile skin command and no public skin manifest flag in v0.1. Treat custom presentation packs as an appendix and future viewer surface, not as world-authoring keys or the headline capability. The shipped instrument is described in the viewer guide.