Chart builder: discoverable entry points — Build Chart door, dataset picker, no-datasets state

docs/architecture/10-interaction-and-feedback.md

@@ -362,6 +362,23 @@ first-use empty state only when one action stays primary. (4) **Domain vocabular
 via /council → Carbon empty-state + content, GOV.UK headings, WAI-ARIA APG button, NN/g. This
 bullet is the contract; cite it, not the source.)_
 
+**Resolved — the creation surface is builder-forward, Monaco-intact (3D).** The guided
+path must be visible where the intent to make a chart forms: the library's creation surface
+is a **primary "Build Chart"** (opens the Chart Builder) beside a **ghost "New JSON
+snippet"** (the old instant create, unchanged) — two plain buttons with clear hierarchy, no
+split/menu-button widget (two static choices don't earn an ARIA menu). The expert path
+stays one visible click away, never hidden (NN/g #6 recognition over recall, #7 flexibility/
+efficiency; Carbon: one primary per surface, a tertiary for the secondary CTA). The builder
+itself opens **without a preselected dataset** (it picks the most recently modified; a
+header **Dataset picker** switches without leaving), and with an empty dataset library it
+shows a **no-datasets state** per the Carbon no-data pattern: what the space does + one
+primary next step ("Add a dataset" → the Datasets create form) — never a dead end. The
+dataset-row "Build Chart" stays as the contextual shortcut; the onboarding canvas gains the
+data-first door ("Build a chart from your data") beside its primary. _(Consulted via
+/council → NN/g #6/#7, Carbon empty-states; recorded in
+docs/chart-builder-enhancement-scope.md §3 · 3D. This bullet is the contract; cite it, not
+the source.)_
+
 **Resolved — one live region per shared message.** When the same error feeds two surfaces
 (the §1 "one producer, two subscribers" case — render errors via `PreviewStore`), exactly
 **one** subscriber is the live region (`role="alert"` on the editor, where focus is); the