feat: add persistent CPU search engine and CLI with lifecycle tests

docs/ROADMAP.md

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+# Production readiness roadmap
+
+Status: implementation started; no production release yet. Windows VM tests use CPU only.
+
+## 1. Search foundation
+- [x] Rust workspace, reusable engine, CLI, versioned SQLite storage.
+- [ ] Filename/path and ranked full-text retrieval with strict filters.
+- [ ] Safe folder discovery, exclusions, bounded extraction, passage locations.
+- [ ] Incremental updates, rename/deletion reconciliation, crash recovery.
+- [x] Persistence and filesystem lifecycle integration tests (Windows CPU).
+
+## 2. Document and semantic retrieval
+- [ ] Text, Markdown, code, PDF and DOCX extraction with fixtures.
+- [ ] Validate actual embedding model artifacts, license, CPU runtime and quantization.
+- [ ] Versioned embeddings, ANN index, exact-match priority and hybrid fusion.
+- [ ] English/German relevance corpus and measured top-10 recall.
+- [ ] Atomic model/index replacement and resumable persistent work queues.
+
+## 3. Desktop
+- [ ] Tauri shell, accessible keyboard search, progressive results and previews.
+- [ ] Folder selection, exclusion controls, resource budgets and indexing status.
+- [ ] Global shortcut, opening/revealing source files, PDF page navigation.
+- [ ] Watchers and reconciliation across Windows, macOS and Linux.
+
+## 4. Media
+- [ ] CPU OCR, image retrieval, audio transcription, video segment locations.
+- [ ] Isolated extraction workers with timeouts and resource ceilings.
+
+## 5. Release gates
+- [ ] Formatting, lint, tests and security/dependency review.
+- [ ] CPU benchmarks: filename p95 <50 ms/1M records; text <150 ms/100K documents; semantic <500 ms on declared hardware.
+- [ ] Measure cold start, indexing throughput, RAM, disk and idle CPU.
+- [ ] Test migrations, interrupted work, invalid documents, inaccessible/offline roots and cloud placeholders.
+- [ ] Automated native build matrix and documented supported cross-compilation paths.
+- [ ] Execute Linux/macOS platform tests; create Windows/macOS/Linux installers.
+- [ ] Signing/notarization configuration, upgrade/rollback validation, release instructions.
+
+Completion requires recorded evidence; targets are not measured results.
+
+## Completed foundation details
+
+- SQLite FTS5 with exact filename priority, text snippets and strict filters.
+- Default directory exclusions and protection against indexing the index itself.
+- Metadata reuse, atomic root reconciliation and schema-v1 migration coverage.
+- Actual CLI process integration tests and independent-reader concurrency test.
+- TypeScript desktop frontend build and dependency audit passed; native validation underway.
+- Initial README commit pushed to Gitea main via protected Infisical injection.
+
+The partial features above do not close broader production milestones such as
+crash-resumable jobs, fuzzy retrieval, watcher reliability or performance targets.