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>

workplans/CE-WP-0002-pdf-review-slice.md

@@ -8,7 +8,7 @@ repo_id: a677c189-b4e2-4f2a-9e48-faa482c277e6
 topic_slug: citation_evidence_mvp
 topic_id: 96fa8e80-9f74-40f2-84cd-644e9747b9ec
 state_hub_workstream_id: 19cb420b-c262-4c0e-afab-e85946b2cfce
-status: todo
+status: done
 owner: Bernd
 created: 2026-05-24
 updated: 2026-05-24
@@ -129,7 +129,7 @@ and proposed alternative. Do not proceed with T03+.
 id: CE-WP-0002-T03
 state_hub_task_id: 01dad096-3521-42b9-aed9-ce0b2f5d3450
 priority: high
-status: todo
+status: done
 depends_on: [T02]
 ```
 
@@ -152,7 +152,7 @@ extracted canonical text must contain the manifest's known-good quote.
 id: CE-WP-0002-T04
 state_hub_task_id: 62e4839a-8026-4e15-b4cc-6685e56b3584
 priority: high
-status: todo
+status: done
 depends_on: [T01, T03]
 ```
 
@@ -183,7 +183,7 @@ confidence ≥ 0.9.
 id: CE-WP-0002-T05
 state_hub_task_id: b339a73a-6b58-471c-a01d-e769ea414ee7
 priority: high
-status: todo
+status: done
 depends_on: [T01]
 ```
 
@@ -206,7 +206,7 @@ No persistence to disk yet. ADR-0005 (persistence) is still pending.
 id: CE-WP-0002-T06
 state_hub_task_id: f400e133-6ec6-4d5a-98a0-a6408ca4125e
 priority: high
-status: todo
+status: done
 depends_on: [T02, T05]
 ```
 
@@ -232,7 +232,7 @@ note in ADR-0001 if it wasn't already.
 id: CE-WP-0002-T07
 state_hub_task_id: 26346a07-bf98-4d43-8b30-de2038ab72f8
 priority: high
-status: todo
+status: done
 depends_on: [T04, T05, T06]
 ```
 
@@ -254,7 +254,7 @@ Active state lives in a single React context for now; no Redux/Zustand.
 id: CE-WP-0002-T08
 state_hub_task_id: 469e3fb4-1b42-49a7-88dc-29a6d5055ef5
 priority: critical
-status: todo
+status: done
 depends_on: [T04, T06, T07]
 ```
 
@@ -276,7 +276,7 @@ Critically, this must also work **after a page reload**. Persistence to
 id: CE-WP-0002-T09
 state_hub_task_id: 77423e57-f2c5-42e1-9e6c-c9b6fa35dfcf
 priority: high
-status: todo
+status: done
 depends_on: [T07, T08]
 ```