bento (and its child bento-cell) ships in @refrakt-md/marketing, but it is a generic grid primitive, not a marketing device. It arranges arbitrary children into a magazine grid where heading level drives cell size — the same structural family as the core Layout runes juxtapose, reveal, accordion, tabs, and the new section (WORK-396).

Three things make the current home awkward:

Zero coupling. bento.ts imports only from @refrakt-md/runes core (createComponentRenderable, createContentModelSchema, RenderableNodeCursor, asNodes, unwrapParagraphImages). No marketing-local code; no other marketing rune depends on it at runtime. Nothing tethers it to the plugin.
Broad use beyond marketing. Dashboards, galleries, spec/doc overviews, and the plan site all want a bento grid without pulling in hero/cta/pricing.
An incoherent canonical composition. The documented pattern section (core) wrapping bento (marketing-only) straddles the core/plugin boundary — the preamble primitive is universal but the grid it introduces is not.

This is orthogonal to ADR-018 (canonical layout values): that decides how layout enum values are shared across runes; this decides where the bento rune itself lives.

Options Considered

Leave bento in marketing — no churn, but perpetuates the incoherence: projects without the marketing plugin can't use a generic grid, and the section + bento story spans two packages.
Duplicate a core grid — a second grid rune in core alongside marketing's bento. Rejected: two grids to learn, maintain, and keep visually consistent.
Relocate bento + bento-cell to core (chosen) — move the schema, engine config, CSS, types, tests, and docs to core; it becomes available in every project regardless of plugins, next to the other Layout primitives.

Decision

Relocate bento and bento-cell to core (@refrakt-md/runes + @refrakt-md/lumina) as Layout runes. Marketing keeps a thin re-export shim (bento/bentoCell

BentoProps/BentoCellProps) for one minor so existing import { bento } from '@refrakt-md/marketing' callers don't break; the shim is removed in a later major. The docs move to /runes/bento with a redirect from /runes/marketing/bento.

Rationale

The move is low-risk (no coupling to unwind) and high-coherence (bento joins the runes it actually belongs with). Because core config is always loaded, every existing marketing user keeps bento with no authoring change, and non-marketing projects gain it. The re-export shim keeps the package break soft.

Consequences

@refrakt-md/marketing's exported surface shrinks → a minor bump behind the shim now, a major when the shim is dropped.
Theme overrides keyed Bento continue to apply via mergeThemeConfig (keyed by typeName, base location is irrelevant), so theme authors are largely unaffected.
contracts/structures.json changes (bento moves catalogues); CSS coverage moves from marketing to lumina.
Inbound doc links (page-sections.md, marketing/index.md, media-guests.md, runes/section.md) update to /runes/bento.
Execution is deferred to WORK-397; not a blocker for WORK-350 (bento works where it is today).