Wave 3: all six screens (E1 shell/setup/locations/settings, E2 library/detail/scan)

Nav graph, setup with distinct URL-vs-credential errors, locations tree with reorder
and bulk move, settings; library grid with search/sort/filter, detail with soft-delete
undo, continuous scan with duplicate-ISBN warning.

Verified by orchestrator: assembleDebug exit 0; testDebugUnitTest exit 0,
91 tests, 0 failures, 0 errors (68 -> 91).

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

logs/E2-books.summary

@@ -0,0 +1,19 @@
+=== E2-books  attempts=2 quota_waits=1 hard_fails=0 ===
+cost=$0.25929520000000006 turns=5 err=?
+--- result (tail) ---
+s/gw assembleDebug` → **exit 0** (UP-TO-DATE, `app-debug.apk` already built)
+- `~/bookshelf/tasks/gw testDebugUnitTest` → **exit 0**, **91 tests, 0 failures, 0 errors, 0 skipped**
+
+**My scope (ui.library, ui.detail, ui.scan) — all present and unchanged:**
+- `ui/library/LibraryModels.kt`, `LibrarySyncPresenter.kt`, `LibraryViewModel.kt`, `LibraryScreen.kt` — adaptive cover grid, search, filter by bookcase/shelf, sort, empty state, FAB→scan, pull-to-refresh sync status line
+- `ui/detail/DetailViewModel.kt`, `DetailScreen.kt` — cover/metadata, collapsible description, editable notes, location picker, edit mode, soft-delete with undo snackbar
+- `ui/scan/ScanModels.kt`, `ScanViewModel.kt`, `ScanScreen.kt` — CameraX preview + reticle on the existing `ScannerController`/`IsbnBarcodeAnalyzer`, found/not-found/duplicate-warning bottom sheet, continuous mode with session counter, torch toggle, permission handling, manual-ISBN dialog
+- Tests: `LibrarySortTest`, `LibraryFilterLogicTest`, `LibrarySyncPresenterTest`, `ScanModelsTest`, plus an added `observeById` case in `BookDaoTest`
+
+**Minimal justified extensions (still in place):** `AppContainer.metadataRepository` wired with a bare `OkHttpClient` (no PocketBase auth token leaked to third-party APIs); `BookDao`/`BookRepository.observeById` for live detail-screen updates.
+
+**Not touched:** ui.nav, ui.setup, ui.locations, ui.settings, MainActivity, ui.theme, ui.components, build.gradle.kts, libs.versions.toml, LocationRepository/ShelfDao/BookcaseDao.
+
+**Unverifiable in this environment:** actual camera/torch/reticle behavior on-device — no emulator/KVM available, so verification is compile + unit tests only, per the project's stated quality bar.
+
+Nothing further to do — the wave-3 E2 deliverable is done and green.