feat(mux): keep Audio Vivid beside the output and add wide_output listings

Audio Vivid skips the mux and its .ts is saved beside the output; a user's avs3Decoder adds a PCM copy. wide_output prints dl listings at the terminal width; cfg saves lowercase true/false as booleans.

docs/guide/output-and-naming.md

@@ -450,6 +450,19 @@ An MP4 title loses:
 - SubStation Alpha (`.ass`) subtitles
 - container tags (`mkvpropedit`)
 
+### Audio Vivid output
+
+No muxer carries Audio Vivid (AVS3-P3): Matroska has no CodecID for it, and FFmpeg and MP4Box cannot
+write it to MP4. unshackle leaves an Audio Vivid track out of the mux and saves its original MPEG-TS file
+beside the output, named like a `--no-mux` audio file (`<name>.<language>.AV3A.ts`).
+
+With an Audio Vivid decoder named `avs3Decoder` in a `binaries` folder or on `PATH`, unshackle also
+decodes the track to PCM and muxes that into the output. unshackle does not ship the decoder: the UWA
+reference decoder's licence limits its use. A service that delivers Audio Vivid can declare the decoder so
+that `unshackle env check` lists it.
+
+Without the decoder, a title whose only tracks are Audio Vivid is not muxed.
+
 ### 3D output
 
 A stereoscopic 3D (MV-HEVC) video track also muxes to MP4 with MP4Box, because Matroska has no

docs/reference/configuration/index.md

@@ -39,6 +39,6 @@ Where the file lives, how unshackle discovers it, and how to edit it:
 | [Post-scripts](post-scripts.md) | `post_scripts` |
 | [External API keys](misc.md#external-api-keys) | `omdb_api_key`, `tmdb_api_key`, `tvdb_api_key`, `tvdb_pin`, `tvdb_order`, `simkl_client_id`, `metadata_providers`, `anilist_title_language`, `disable_metadata`, `decrypt_labs_api_key`, `ipinfo_api_key` |
 | [Caching & updates](misc.md#caching-updates) | `title_cache_enabled`, `title_cache_time`, `title_cache_max_retention`, `update_checks`, `update_check_interval` |
-| [Appearance](misc.md#appearance) | `theme` |
+| [Appearance](misc.md#appearance) | `theme`, `wide_output` |
 | [Logging, privacy & debug](misc.md#logging-privacy-debug) | `redact_paths`, `debug`, `debug_keys`, `debug_requests`, `set_terminal_bg` |
 | [Deprecated & removed](misc.md#deprecated-removed-keys) | `curl_impersonate`, `downloader`, `scene_naming` |

docs/reference/configuration/misc.md

@@ -146,6 +146,7 @@ calls.
 | Key | Type | Default | Description |
 |-----|------|---------|-------------|
 | `theme` | str | `catppuccin-mocha` | Named colour theme for all CLI output: banner, logs, progress bars, and help screens. One of `catppuccin-mocha` (aliases `default`, `catppuccin`, `mocha`), `dracula`, `nord`, `gruvbox`, `one-dark` (alias `onedark`), `tokyo-night` (alias `tokyonight`), `monokai`, `flexoki`, `solarized-dark` (alias `solarized`). Case-insensitive; underscores work in place of hyphens. Unknown names fall back to the default with a warning. Preview them all with `unshackle env theme`. |
+| `wide_output` | bool | `false` | Print the `dl` title and track listings at the terminal width. When `false`, they fold at 80 columns, the width that logs and progress bars always use. |
 
 ---