Implement CE-WP-0002 T03-T09: ingest, anchor resolution, engine, UI, persistence, e2e

Completes the PDF review slice end-to-end. After this commit a user can
open a fixture, select text, save an evidence item with commentary, see
it in the sidebar, reload the page, click the item, and the viewer
scrolls to the passage.

- T03 src/source/pdf/{fingerprint,extract,ingest}.ts + 39 fixture tests
  - SHA-256 fingerprint over a fresh ArrayBuffer (TS BufferSource-safe)
  - PDF.js text extract; per-page normalize then join with "\n\n"
  - PageMap + OffsetMap (gap-free coverage); pageLength = end - start
  - Updated manifest's Betriebskosten quote to one PDF.js extracts cleanly
- T04 src/anchor/selectors/{create,resolve}.ts + 25 unit + 7 fixture tests
  - createSelectors emits the maximal redundant set (TextQuote +
    TextPosition + PdfRect + PdfPageText when available)
  - resolveSelectors implements the SharedContracts §7 ladder; confidence
    1.0 (pos+quote) → 0.7 (rect-only) → 0 (unresolved)
  - Cross-module integration test moved to tests/integration/ to honor
    the anchor↛source boundary lint rule
- T05 engine: sync event bus over the closed §4 vocabulary, Map-backed
  repos, services, createEngine() composition root, 12 tests
- T06 work + app: three-pane shell (CollectionList | ViewerShell |
  EvidenceSidebar) wired through EngineProvider; EngineContext lives in
  src/work/ to respect the work↛app boundary; SpikeApp deleted
- T07 AnnotationToolbar: pendingSelection in context; Save runs
  createSelectors → engine.annotations.create → engine.evidence.create
- T08 click-to-reopen + localStorage persistence
  - scrollToAnnotation state in context with a version counter so a
    second click on the same item re-fires the viewer scroll
  - captureSnapshot/restoreSnapshot/attachPersister/restoreFromStorage;
    restore bypasses services to avoid event-loops
  - active-document id persisted alongside the snapshot so reload lands
    on the same fixture; ADR-0005 written
  - 9 persistence tests
- T09 tests/integration/app-prd-scenario.dom.test.tsx
  - end-to-end happy-dom test of PRD scenario steps 1-8 through the real
    React tree; viewer + ingest mocked per ADR-0004's headless-Chromium
    limitation. Fixed memo-deps bug in EvidenceSidebar/ViewerShell where
    useEngineEventTick values were not included in the useMemo deps,
    leaving stale memoization across event-driven re-renders
- vitest.config.ts: happy-dom for *.dom.test.{ts,tsx} files
- noEmit added to tsconfig so tsc -b doesn't litter src/ with .js outputs

Gates: typecheck ✓ lint ✓ test 109/109 across 11 files ✓ build ✓

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/app/App.tsx

@@ -0,0 +1,40 @@
+/**
+ * App — the citation-evidence MVP shell.
+ *
+ * Three-pane layout per `wiki/ArchitectureOverview.md` §12.1:
+ *
+ *     ┌────────────┬──────────────────┬────────────┐
+ *     │ Collection │ Document Viewer  │ Evidence   │
+ *     │ List       │                  │ Sidebar    │
+ *     └────────────┴──────────────────┴────────────┘
+ *
+ * CE-WP-0002-T06 stops at "viewer shell is rendered, evidence list is
+ * displayed". T07 wires the selection → annotation → evidence flow; T08
+ * wires the sidebar-click → scroll-to-passage round-trip.
+ */
+
+import {
+  CollectionList,
+  EngineProvider,
+  EvidenceSidebar,
+  ViewerShell,
+} from "@work/index";
+
+export function App() {
+  return (
+    <EngineProvider>
+      <div
+        style={{
+          display: "flex",
+          height: "100vh",
+          fontFamily: "system-ui, sans-serif",
+          color: "#222",
+        }}
+      >
+        <CollectionList />
+        <ViewerShell />
+        <EvidenceSidebar />
+      </div>
+    </EngineProvider>
+  );
+}