EANCH-WP-0001 T05 (prep): make root a full barrel for umbrella cutover

The umbrella's DOM tests vi.mock the single @anchor/index barrel (spreading
the original and overriding PdfSpikeViewer). To keep the cutover a mechanical
specifier swap and preserve those mocks, the evidence-anchor root re-exports
the full surface (pure core + PDF adapter), matching the prior @anchor/index.
evidence-anchor/pdf remains a focused viewer entry. Viewer code still lives
only under src/pdf/ (eslint-enforced). Repo stays green: 30 tests, tc, lint.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/index.ts

@@ -1,16 +1,38 @@
-// Public entrypoint for `evidence-anchor`.
+// Public entrypoint for `evidence-anchor` — the full barrel.
 //
-// The stable surface consumers depend on:
-//   - adapter-side types + the viewer contract  (./types)
-//   - selector creation / resolution             (./selectors)
+// Mirrors the surface the umbrella previously consumed as `@anchor/index`, so
+// consumers (and their `vi.mock(...)` calls) resolve every anchor symbol from a
+// single specifier. Viewer *code* still lives only under `src/pdf/` (enforced
+// by eslint); this barrel merely re-exports it.
 //
-// The concrete PDF adapter lives behind the `evidence-anchor/pdf` subpath
-// (./pdf) so pure consumers do not pull PDF.js or React into their bundle.
+// A focused, viewer-free entry is also available at `evidence-anchor/pdf` for
+// consumers that want the PDF surface explicitly — but importing the package
+// root pulls in the PDF adapter, matching the pre-extraction behaviour.
 
+// Adapter-side types + the viewer contract.
 export * from "./types";
+
+// Selector creation / resolution (pure core).
 export {
   createSelectors,
   resolveSelectors,
   DEFAULT_CONTEXT_CHARS,
   type CreateSelectorsOptions,
 } from "./selectors";
+
+// PDF adapter + helpers (re-exported from the src/pdf/ boundary).
+export {
+  PdfSpikeViewer,
+  getHighlightClientRects,
+  selectorsFromPdfCapture,
+  findPdfRectSelector,
+  findTextQuoteSelector,
+  unionRect,
+  runScrollToHighlightJob,
+  DEFAULT_SCROLL_ATTEMPTS,
+  type PdfSpikeViewerProps,
+  type StoredAnnotation,
+  type ScrollToHighlightJob,
+  type ScrollToHighlightDeps,
+  type ScrollToHighlightState,
+} from "./pdf";