feat(audio): exclusive output on Linux and macOS, and a name that is not WASAPI's

CLAUDE.md

@@ -56,7 +56,7 @@ React 19 + TypeScript. Entry: `src/main.tsx` → `src/App.tsx`.
 Inside `crates/app/src/`:
 
 - **`commands/`** — one module per domain (`library`, `playlist`, `smart_playlists`, `track`, `browse`, `player`, `scan`, `edit`, `profile`, `analysis`, `deezer`, `similar`, `lyrics`, `stats`, `wrapped`, `maintenance`, `radio`, `duplicates`, `preferences`, `plugins`, `canvas`, …), all registered in `lib.rs::generate_handler![]`. CRUD delegates to `waveflow_core::repository::sqlite::*`; IPC + state + filesystem + emit glue stays in the command.
-- **`audio/`** — 3-thread lock-free engine: `decoder.rs` (symphonia + rubato), `output.rs` (cpal callback on its own thread, SPSC `rtrb` ring), `state.rs` (`SharedPlayback` atomics), `analytics.rs`, `crossfade.rs`, `eq.rs`, `spectrum.rs`, `wasapi_exclusive.rs`. Topology: [`docs/architecture/audio.md`](docs/architecture/audio.md).
+- **`audio/`** — 3-thread lock-free engine: `decoder.rs` (symphonia + rubato), `output.rs` (cpal callback on its own thread, SPSC `rtrb` ring), `state.rs` (`SharedPlayback` atomics), `analytics.rs`, `crossfade.rs`, `eq.rs`, `spectrum.rs`, the three exclusive backends (`wasapi_exclusive.rs`, `alsa_exclusive.rs`, `coreaudio_exclusive.rs`). Topology: [`docs/architecture/audio.md`](docs/architecture/audio.md).
 - **`dlna/`** (axum + SSDP, opt-in) · **`mpd/`** (TCP MPD protocol, opt-in) · **`media_controls.rs`** (souvlaki → SMTC / MPRIS / MediaRemote) · **`discord_presence.rs`** · **`queue.rs`** · **`player_actions.rs`** (shared control sequence) · **`remote/`** (remote source + sync v2, feature `sync_v2`, now in the default feature set; `remote/mirror.rs` walks the server's catalogue into the projection so both sources can be browsed from one library; `remote/download.rs` keeps a track's bytes in a managed folder the scanner never sees while `remote/import.rs` copies them into a scanned one, where they become a local track linked to the server's; `remote/upload.rs` is the fourth direction — offering the server what it lacks, deduplicated offline against the mirror and hashed once via `remote/hashing.rs`; `mod sync` is now a permanent no-op stub — v1 was removed in the RFC-005 cutover) · **`backup.rs`** · **`db/`** (pool wiring + `migration_heal`).
 - **Scanner** — the orchestrator `scan_folder_inner` stays app-side (it emits `scan:progress`); every pure helper lives in `waveflow_core::scanner::{extract, upserts}`.
 - **Database** — per-profile SQLite via sqlx + a global `app.db` for the profile list and app-wide settings. Migrations at `src-tauri/migrations/{app,profile}/`, compiled in via `sqlx::migrate!`. Layout: [`docs/architecture/storage.md`](docs/architecture/storage.md).
@@ -92,7 +92,7 @@ Names in `commands/`, `audio/` and `src/components/` are predictable — read th
 
 | Area         | Doc                                                                                                     | Covers                                                                                                                                                                   |
 | ------------ | ------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
-| Playback     | [`playback.md`](docs/features/playback.md)                                                              | decoder + DSD pipeline, native DSD via DoP, crossfade (static / smart / dynamic), gapless, ReplayGain, EQ, speed, network pre-load, WASAPI exclusive, spectrum visualizer, A-B repeat, queue |
+| Playback     | [`playback.md`](docs/features/playback.md)                                                              | decoder + DSD pipeline, native DSD via DoP, crossfade (static / smart / dynamic), gapless, ReplayGain, EQ, speed, network pre-load, exclusive output (WASAPI / ALSA / CoreAudio), spectrum visualizer, A-B repeat, queue |
 | Library      | [`library.md`](docs/features/library.md)                                                                | scanner + watcher, folder covers, local artist images, search + filters, tag editor, ratings, duplicates, import, history, multi-artist split                            |
 | Playlists    | [`playlists.md`](docs/features/playlists.md) · [`smart-playlists.md`](docs/features/smart-playlists.md) | CRUD, sorting, auto-covers, M3U, Daily Mix + On Repeat generators, rule tree                                                                                             |
 | Integrations | [`integrations.md`](docs/features/integrations.md)                                                      | Deezer, Last.fm, TheAudioDB, lyrics providers + editor, artist overrides, Discord RPC, OS notifications, scrobbling                                                      |

README.md

@@ -65,7 +65,7 @@ WaveFlow is a desktop music player for the audio files you already own. It scans
 
 | Area                | Highlights                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | Deep dive                                                                     |
 | ------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------- |
-| **Playback**        | Symphonia + cpal, lock-free 3-thread engine, real dual-decoder crossfade, gapless, ReplayGain (file tags or BS.1770 analysis, with pre-amp and clipping prevention), 6-band EQ (20 presets), **WASAPI Exclusive** bit-perfect output (Windows, opt-in, transparent cpal fallback), DSD → PCM, variable playback speed (0.5×–2×), spectrum visualizer, sleep timer, seed + mood radio, A-B repeat, output-device picker, OS media controls (SMTC / MPRIS / MediaRemote), persistent queue with shuffle / repeat / auto-advance                                                                                                                                                         | [docs](docs/features/playback.md)                                             |
+| **Playback**        | Symphonia + cpal, lock-free 3-thread engine, real dual-decoder crossfade, gapless, ReplayGain (file tags or BS.1770 analysis, with pre-amp and clipping prevention), 6-band EQ (20 presets), **exclusive output** (opt-in, transparent cpal fallback — WASAPI Exclusive on Windows, a raw ALSA `hw:` device on Linux, CoreAudio hog mode on macOS), DSD → PCM, variable playback speed (0.5×–2×), spectrum visualizer, sleep timer, seed + mood radio, A-B repeat, output-device picker, OS media controls (SMTC / MPRIS / MediaRemote), persistent queue with shuffle / repeat / auto-advance                                                                                                                                                         | [docs](docs/features/playback.md)                                             |
 | **Library**         | Folder scanning + filesystem watcher, on-demand audio analysis (peak, BS.1770 loudness, ReplayGain, BPM), Hi-Res badges, multi-artist split, POPM 5-star ratings, A-Z navigator, multi-select action bar                                                                                                                                                                                                                                                                                                                                                                                                                | [docs](docs/features/library.md)                                              |
 | **Playlists**       | Drag-and-drop reorder (virtualised), bulk add from any source, M3U import / export with basename-fallback matching, likes, recently-played                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | [docs](docs/features/playlists.md)                                            |
 | **Smart playlists** | Auto-generated **Daily Mix** family bucketed by tempo, with composite artist-photo covers rendered from your Deezer cache                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | [docs](docs/features/smart-playlists.md)                                      |