docs: update docs to match current codebase

docs/OUTPUT_CONFIG.md

@@ -38,7 +38,7 @@ This is **required** in your `unshackle.yaml` — a warning is shown if not conf
 Available variables: `{title}`, `{year}`, `{season}`, `{episode}`, `{season_episode}`, `{episode_name}`,
 `{quality}`, `{resolution}`, `{source}`, `{audio}`, `{audio_channels}`, `{audio_full}`,
 `{video}`, `{hdr}`, `{hfr}`, `{atmos}`, `{dual}`, `{multi}`, `{tag}`, `{edition}`, `{repack}`,
-`{lang_tag}`
+`{lang_tag}`, `{track_number}`, `{artist}`, `{album}`, `{disc}`
 
 Add `?` suffix to make a variable conditional (omitted when empty): `{year?}`, `{hdr?}`, `{repack?}`
 
@@ -70,17 +70,26 @@ If not configured, the default folder naming is used:
 - Series: Derived from the `series` template with episode-specific variables removed
 - Songs: `Artist - Album (Year)`
 
+`folder` accepts either a single string (applies to all title kinds) or a mapping with per-kind
+templates keyed by `movies`, `series`, and/or `songs`. Unknown keys are warned about and ignored.
+
 ```yaml
 output_template:
   movies: '{title}.{year}.{repack?}.{edition?}.{quality}.{source}.WEB-DL.{dual?}.{multi?}.{audio_full}.{atmos?}.{hdr?}.{hfr?}.{video}-{tag}'
   series: '{title}.{year?}.{season_episode}.{episode_name?}.{repack?}.{edition?}.{quality}.{source}.WEB-DL.{dual?}.{multi?}.{audio_full}.{atmos?}.{hdr?}.{hfr?}.{video}-{tag}'
   songs: '{track_number}.{title}.{repack?}.{edition?}.{source?}.WEB-DL.{audio_full}.{atmos?}-{tag}'
 
-  # Scene-style folder
+  # Scene-style folder (single template, applies to all kinds)
   folder: '{title}.{year?}.{repack?}.{edition?}.{lang_tag?}.{quality}.{source}.WEB-DL.{dual?}.{multi?}.{audio_full}.{atmos?}.{hdr?}.{hfr?}.{video}-{tag}'
 
   # Plex-friendly folder
   # folder: '{title} ({year?})'
+
+  # Per-kind folder templates
+  # folder:
+  #   movies: '{title} ({year})'
+  #   series: '{title} ({year?})'
+  #   songs: '{artist} - {album} ({year?})'
 ```
 
 Example outputs:
@@ -230,6 +239,7 @@ The following directories are available and may be overridden,
 - `cache` - Expiring data like Authorization tokens, or other misc data.
 - `cookies` - Expiring Cookie data.
 - `logs` - Logs.
+- `exports` - JSON sidecar exports written when `--export` is used on `dl`.
 - `wvds` - Widevine Devices.
 - `prds` - PlayReady Devices.
 - `dcsl` - Device Certificate Status List.