WORK-429
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ID:WORK-429Status:ready

sandbox bg preset (transform-resolved)

SPEC-104 §5: make a reusable sandbox backdrop applicable by name (bg="midnight-waves") like any other preset, by adding a sandbox descriptor to BgPresetDefinition — resolved at transform time (not the identity engine, which has no file access), expanding into the WORK-428 data-bg-guest body.

Priority:highComplexity:complexMilestone:v0.24.0Source:SPEC-104
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Relationships

Implements 1
Related 4
Branches 5
main current ready
claude/milestone-v0.24.0-split readychangeset-release/main readymain readyclaude/v023-bg-motion-breakdown readyclaude/defer-work-417 ready

Scope

  • Type — BgPresetDefinition (packages/transform/src/types.ts) gains sandbox?: { src: string; framework?: string; dependencies?: string }, a sibling to the engine-resolved gradient/style.
  • Transform-time expansion — a new step (where the sandbox readers live) sees bg="name", finds a sandbox-typed preset, and injects the real {% sandbox %} guest into the bg body — producing the same data-bg-guest element WORK-428 relocates. The preset is sugar over the body primitive, not a parallel path.
  • Forced behaviours not author-set — height: fill, presentational posture, eager activation come from the bg-guest mechanism; the preset describes only the scene (src/framework/dependencies). A preset may also carry gradient/style for the boot frame (both land in the same data-name="bg" div); extends resolves as for other bg presets.
  • Config home + schema — sandbox presets live in project config (refrakt.config.json sites.<site>.backgrounds) per the SPEC-088 project-vs-theme split (a scene is content); project backgrounds merge over theme. refrakt.config.schema.json gains the sandbox key.
  • Memoisation — a named scene's assembled source is byte-identical across pages; build the bundle once and clone per page (an optimisation only the named path affords).

Acceptance Criteria

  • BgPresetDefinition gains a sandbox descriptor (src/framework/dependencies); refrakt.config.schema.json documents it; project backgrounds merge over theme.
  • A sandbox-typed preset is resolved at transform time by an expansion step that injects the WORK-428 body guest — not in the identity engine; bg="name" reaches author-parity with a gradient preset.
  • A sandbox preset may also carry gradient/style (boot frame); extends resolves as for other bg presets; forced fill/posture/eager are not author-set.
  • Assembled scene source is memoised per preset name (built once, cloned per page); tests cover expansion, the schema, and dedup.

Dependencies

  • WORK-428 — consumes its data-bg-guest body contract.

References

  • SPEC-104 §5 · packages/transform/src/types.ts (BgPresetDefinition) · refrakt.config.json / refrakt.config.schema.json · SPEC-088 (project-vs-theme preset home) · packages/runes/src/tags/sandbox.ts (the rune the expander instantiates).