docs: add lineage README mapping v1→v6 evolution

Overview table, engine evolution notes, and per-version caveats.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

README.md

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+# sing_detect
+
+Consolidated history of my singing/music-segment detection tools, gathered from
+across several projects and ranked by **technical & functional evolution** (not
+by file timestamp). The goal of every version is the same:
+
+> Take a long live-stream recording, find the segments where someone is singing,
+> and export markers (CSV / EDL / JSON) for fast editing in DaVinci Resolve.
+
+Each version lives in its own folder and was committed as a separate step so the
+git history reads as the evolution story.
+
+| Version | Folder | Engine | Interface | Leap |
+|---------|--------|--------|-----------|------|
+| v1 | `v1_svd_prototype/` | HuggingFace `matthijs/svd` (torch.jit) | tkinter file picker | First prototype — single file, proves the idea |
+| v2 | `v2_transformers_gui/` | `transformers` pipeline + pyannote | CustomTkinter GUI | Overlapping-chunk inference, CSV timecode export |
+| v3 | `v3_inaseg_cli/` | inaSpeechSegmenter | CLI (argparse) | Robust pipeline: gap-merge, min-duration, EDL+CSV |
+| v4 | `v4_inaseg_batch/` | inaSpeechSegmenter | CLI batch | Process whole folders, `--recursive`, `--auto-cut` |
+| v5 | `v5_stream_tools_app/` | inaSpeechSegmenter | CustomTkinter multi-tab app | Refactored into modular `core/` engine + UI tab, JSON + ffmpeg-script export |
+| v6 | `v6_stream_studio_tauri/` | inaSpeechSegmenter (Python sidecar) | Tauri (Rust + TS) | Cross-platform rewrite; Python reduced to a thin ML sidecar emitting line-JSON |
+
+## Engine evolution
+`svd model` → `transformers pipeline` → **`inaSpeechSegmenter`** (settled from v3 on,
+which classifies singing voice as "music").
+
+## Notes per version
+- **v4** includes a copy of `detect_singing.py` because `batch_detect.py` imports it at runtime.
+- **v5** keeps the original package layout (`core/`, `ui/`, `utils/`) so the relative imports resolve; it was extracted from the larger `stream_tools` app.
+- **v6** is the detection slice only (`sidecar_detect.py`, `detect.rs`, `detect.ts`), extracted from the `stream-studio` Tauri app — `detect.ts` still references the app's `../dom`, `../ui`, `../api` modules.
+
+## Excluded
+`song_detection_cn.py` (an ACRCloud-style fingerprint *song-identification* API client)
+was **not** included — it identifies/names a track rather than detecting singing segments.