Why: unified renderer Task 11 needs a reader/delivery UI over the RDM
document tree: four-level rule selection with controlled-document
no-fallback explanation, preview with node-linked diagnostics, a
structure canvas and a linear reader sharing one selection and filter,
review annotations/revisions, and per-delivery downloads.
Evidence: npx vitest run -> 35 files, 338 tests passed (45 new in
test/document-render-workspace.test.ts, design-guard green);
npm run build -> tsc -b + vite build ok; npx knip -> findings identical
to the pre-existing baseline (check-knip 43 <= 43); git diff --check
clean. e2e/document-renderer.playwright.ts authored, not executed.
Impact: new src/documentRenderPresentation.ts (pure helpers) and
src/components/DocumentRenderWorkspace.tsx, opened from a per-document
"阅读与交付" action in the audit materials tree; store gains an
rdmRender capability probe (fail-closed); audit export reuses the shared
base64 file saver; token-only styles appended to styles.css. Async
state is owned per hook with request guards plus identity epoch, and
the workspace remounts per identity/project/document scope.
Refs: unified renderer plan Task 11
Co-authored-by: Cursor <cursoragent@cursor.com>
