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>

fixtures/pdfs/manifest.json

@@ -1,14 +1,14 @@
 {
   "_schema_version": 1,
   "_description": "PDF fixture corpus for citation-evidence selector tests. Each entry binds a stable id (used by test code) to a file path, page count, and a verbatim known-good quote with its 1-indexed physical PDF page number. The quote is short, unique within the document, and chosen to round-trip cleanly through the canonical text normalizer.",
-  "_provenance": "Page counts and quotes extracted on 2026-05-24 by reading each PDF directly. The Betriebskosten file is a scanned/handwritten form with noisy OCR text — its quote is taken from the reliably-extracted printed boilerplate, not from the handwritten fields.",
+  "_provenance": "Page counts and quotes extracted on 2026-05-24 by reading each PDF directly, then re-verified on 2026-05-25 against the PDF.js v4 text extractor used by src/source/pdf/extract.ts. The Betriebskosten file is a scanned/handwritten form with noisy OCR text — its known-good quote was updated 2026-05-25 from 'Ich bitte um Überweisung auf das Konto bei' to 'Auf der Rückseite finden Sie Ihre Abrechnung' because PDF.js drops the capital-Ü in the original (the lowercase-ü in 'Rückseite' survives, so the new quote still exercises the umlaut code path).",
   "fixtures": [
     {
       "id": "betriebskosten-2024",
       "filename": "031-Kemal Güldag Betriebskosten 2024.pdf",
       "description": "German Betriebskostenabrechnung (utility-cost statement) for a Seeheim apartment — scanned cover letter + filled-in Abrechnung form. OCR-noisy text and handwritten field values. Useful for stress-testing canonical normalization and selector resolution on imperfect extraction.",
       "page_count": 2,
-      "known_good_quote": "Ich bitte um Überweisung auf das Konto bei",
+      "known_good_quote": "Auf der Rückseite finden Sie Ihre Abrechnung",
       "known_good_quote_page": 1,
       "characteristics": ["german", "umlauts", "scanned", "ocr-noisy", "form", "handwritten"]
     },