test: capture re-baseline inventory + coverage snapshot (phase 0)

tests/baseline/QUARANTINE.md

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+# Quarantine List (Phase 0 Baseline)
+
+Items deferred from this baseline capture. Phase 4 (e2e serial-bucket repair)
+empties this file.
+
+## E2E serial bucket (known-red, pre-2.0-UI selectors)
+
+The following `chromium-serial` specs rely on pre-2.0 selectors and are not yet
+updated. They are the explicit subject of Phase 4, not repaired here:
+
+- `gui-settings-general.spec.ts`
+- `gui-settings-rbac.spec.ts`
+- `gui-settings-people.spec.ts`
+- `rbac.spec.ts`
+- `rbac-full.spec.ts`
+- `people.spec.ts`
+- `theme.spec.ts`
+
+## Docker suite (`pnpm test:docker`)
+
+The full-container install-smoke gate (`docker-compose.test.yml`) churns tens of
+GB of build cache on this machine (see CLAUDE.md ops note). It is run and
+elevated in Phase 4. Last-known CI status: see `.github/workflows/test.yml`
+(the `docker` job).
+
+## Local doc-binary skips (not quarantine, informational)
+
+The following integration test files skip cleanly via `describe.skipIf`
+because `pandoc`, `libreoffice`/`soffice`, `pdfcpu`, and `pdf2docx` are not
+installed on this development machine. These pass in CI where the Docker image
+provides all binaries:
+
+- `convert-document.test.ts`
+- `epub-convert.test.ts`
+- `html-to-pdf.test.ts`
+- `doc-to-pdf.test.ts`
+- `pdf-to-docx.test.ts`
+- `compress-pdf.test.ts`
+- `pdf-to-image.test.ts`
+
+Total local integration skips: 217 tests across 7 files.