Update SoundType GitHub about metadata

Author: M3RCU3Y

docs/ENTER_DING_SOURCE_NOTES_UNTRACKED.md

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+# Enter Ding Sample Source Notes
+
+This note is intentionally untracked. It records where the Enter Ding samples in
+`assets/packs/SoundType-EnterDing` came from, based on the local source-of-truth
+files already in the repo.
+
+## Local Files Checked
+
+- `assets/packs/SoundType-EnterDing/pack.json`
+- `assets/packs/SoundType-EnterDing/SOURCE.txt`
+- `THIRD_PARTY_NOTICES.md`
+- `docs/SAMPLE_PROVENANCE.md`
+
+## Pack
+
+- Pack id: `soundtype-enter-ding`
+- Pack name: `SoundType Enter Ding`
+- Version: `1.2.0`
+- Local folder: `assets/packs/SoundType-EnterDing`
+- Shipped groups:
+  - `normal`: `ding-01.wav` through `ding-12.wav`
+  - `enter`: `ding-01.wav` through `ding-12.wav`
+  - individual groups: `ding-01` through `ding-12`
+
+The `normal` and `enter` folders contain matching copies of the twelve ding
+variants. The app exposes them in Settings as:
+
+- `ding-01`: Classic Typewriter Bell
+- `ding-02`: Bright Margin Bell
+- `ding-03`: Antique Return Bell
+- `ding-04`: Warm Carriage Bell
+- `ding-05`: Clean Line Bell
+- `ding-06`: Tiny Line Bell
+- `ding-07`: Reward Tap Bell
+- `ding-08`: Golden Margin Bell
+- `ding-09`: Pleasing Star Bell
+- `ding-10`: Warm Desk Bell
+- `ding-11`: Round Desk Bell
+- `ding-12`: Deep Typewriter Bell
+
+## Source Recordings Listed Locally
+
+`assets/packs/SoundType-EnterDing/SOURCE.txt` lists these source recordings:
+
+- `https://freesound.org/people/ramsamba/sounds/318687/`
+  - Local note: `Typewriter Bell.wav`
+- `https://freesound.org/s/318686/`
+  - Local note: `Typewriter Carriage Return.wav`
+- `https://freesound.org/people/knufds/sounds/345955/`
+  - Local note: `Typewriter bell & carriage reset`
+- `https://freesound.org/people/MasterNavigator/sounds/444813/`
+  - Local note: `typewriter bell`
+- `https://opengameart.org/content/point-bell`
+- `https://opengameart.org/content/bell-dingschimes`
+- `https://opengameart.org/content/pleasing-bell-sound-effect`
+  - Local note: `pleasing-bell.wav`
+- `https://opengameart.org/content/correct-bell`
+  - Local note: `bell.wav`
+
+The newer variants are processed from OpenGameArt downloads plus derivatives of
+the classic typewriter bell:
+
+- `sd_0.wav`
+- `pleasing-bell.wav`
+- `bell.wav`
+
+## License / Provenance Note
+
+The local pack metadata says:
+
+- `license`: `Processed CC0 source recordings. See SOURCE.txt and THIRD_PARTY_NOTICES.md.`
+
+The local `SOURCE.txt` says:
+
+- License: Creative Commons 0 / public domain source recordings.
+
+`THIRD_PARTY_NOTICES.md` also records the same Enter Ding source links and says
+the bundled WAV files are trimmed, filtered, mixed, and normalized derivatives
+for low-latency playback. The classic typewriter bell derivative keeps a longer
+residual tail so it can decay naturally instead of cutting off after the initial
+strike.
+
+## Processing Note
+
+The local source note says the source recordings were:
+
+- converted to mono 44.1 kHz 16-bit WAV
+- trimmed for short Enter overlays
+- high/low-pass filtered
+- lightly mixed with a typewriter carriage transient
+- normalized with limiter headroom
+- faded in/out to avoid clicks, crackle, clipping, repeated-tail buildup, or
+  harsh ringing
+
+## Confidence
+
+This document is based on local repository records, not a fresh web re-check of
+each source page. The repo-local attribution trail is internally consistent:
+`pack.json`, `SOURCE.txt`, `THIRD_PARTY_NOTICES.md`, and
+`docs/SAMPLE_PROVENANCE.md` all point to the same provenance story.