[SDUI] Epic: complete the Server-Driven UI runtime

[xuyushun441-sys]

Tracking issue for completing the Server-Driven UI (SDUI) runtime — the original north star: every UI surface is described by a schema, rendered generically by SchemaRenderer, visually editable at runtime, and persisted via draft→publish.

✅ Done

• Rendering engine: SchemaRenderer + component registry (~140 types, lazy-loaded)
• Record detail pages: schema-driven (default synthesis buildDefaultPageSchema + author assignment + slotted overrides); legacy DetailView retained behind a kill-switch
• Dashboards & reports: schema-driven and visually editable + draft/publish
• Runtime metadata persistence seam (ADR-0034) for view/report/dashboard
• Master-detail vertical (atomic write inlineEdit, read-side relatedList, server roll-ups) — the worked SDUI sample for the record surface
• Metadata-generation lint + eval rubric (objectstack lint --score/--eval)

🔴 P0 — close the write-side loop

• [SDUI][P0] Wire PageDesigner → record page persistence (draft/publish) #1541 Wire PageDesigner → record page persistence (draft/publish)
• [SDUI][P0] RuntimeDraftBar for record pages & forms #1542 RuntimeDraftBar for record pages & forms
• [SDUI][P0] Form layout designer (slot overrides + visual editor) #1543 Form layout designer (slot overrides + visual editor)

🟠 P1 — unify list & navigation under schema

• [SDUI][P1] Unify list/grid views under PageSchema + viewType synthesis #1544 Unify list/grid views under PageSchema + viewType synthesis
• [SDUI][P1] Schema-driven app navigation (NavigationDesigner runtime wiring) #1545 Schema-driven app navigation (NavigationDesigner runtime wiring)

🟡 P2 — remaining page types & configurability

• [SDUI][P2] Home page rendering + assignment + default synthesis #1546 Home page rendering + assignment + default synthesis
• [SDUI][P2] App & Utility page types (pageType app/utility) #1547 App & Utility page types (pageType app/utility)
• [SDUI][P2] Schema configurability for charts & alt list views #1548 Schema configurability for charts & alt list views

Suggested sequencing

P0-#1541 → #1542 first (rendering + synthesis + persistence seam are already in place; this makes "edit a record page in the browser and publish" real and reuses the existing live e2e harness), then #1543 (forms), then P1, then P2.