[codex] Improve chord export, diagnostics, and job reliability

CONTRIBUTING.md

@@ -1,18 +1,22 @@
-# Contributing to StemDeck
+# Contributing to LayerLab
 
-Thanks for your interest in StemDeck - free, local stem separation for musicians. Contributions of
-all kinds are welcome, whether you write code or not.
+Thanks for your interest in LayerLab, an unofficial modified StemDeck fork test
+build of StemDeck. Contributions of all kinds are welcome, whether you write
+code or not.
+
+This fork is not an official upstream release and is not affiliated with or
+endorsed by the original StemDeck project.
 
 By participating you agree to follow our [Code of Conduct](CODE_OF_CONDUCT.md).
 
 ## Ways to contribute
 
-- **Report a bug** - open a [Bug report](https://github.com/stemdeckapp/stemdeck/issues/new/choose).
-  Include your OS, the StemDeck version (Help icon -> About), and clear steps to reproduce.
-- **Suggest a feature** - open a [Feature request](https://github.com/stemdeckapp/stemdeck/issues/new/choose).
+- **Report a bug** - open an issue on [this fork](https://github.com/bassmicrobe/stemdeck/issues).
+  Include your OS, the LayerLab version (Help icon -> About), and clear steps to reproduce.
+- **Suggest a feature** - open an issue on [this fork](https://github.com/bassmicrobe/stemdeck/issues).
 - **Improve the docs** - fixes and clarifications to the README or these guides are always useful.
 - **Write code** - bug fixes and features. For anything large, please open an issue or a
-  [Discussion](https://github.com/stemdeckapp/stemdeck/discussions) first so we can agree on the
+  [Issue](https://github.com/bassmicrobe/stemdeck/issues) first so we can agree on the
   approach before you invest time.
 - **Found a security issue?** Do not open a public issue - see [SECURITY.md](SECURITY.md).
 
@@ -73,10 +77,12 @@ New API endpoints and pipeline stages should come with tests under `tests/`. The
 
 ## License
 
-StemDeck is licensed under the [Apache License 2.0](LICENSE). By contributing, you agree that your
+LayerLab is based on the original StemDeck project and is licensed
+under the [Apache License 2.0](LICENSE). See [NOTICE](NOTICE) for upstream
+attribution and the modification notice. By contributing, you agree that your
 contributions are licensed under the same terms.
 
 ## Questions
 
-Open a [Discussion](https://github.com/stemdeckapp/stemdeck/discussions) or join the
-[Discord](https://discord.gg/2MVsWqaPRe). Thanks for helping make StemDeck better.
+Open an issue on [this fork](https://github.com/bassmicrobe/stemdeck/issues).
+Thanks for helping make LayerLab better.

NOTICE

@@ -0,0 +1,51 @@
+LayerLab
+
+LayerLab is an unofficial modified fork test build based on the
+original StemDeck project.
+
+Original project:
+  StemDeck
+  https://github.com/stemdeckapp/stemdeck
+
+Original license:
+  Apache License, Version 2.0
+  See LICENSE in this distribution, or:
+  https://www.apache.org/licenses/LICENSE-2.0
+
+Attribution:
+  Portions of this software are based on StemDeck by the StemDeck contributors.
+  LayerLab retains the upstream Apache-2.0 license text and
+  attribution. This distribution is a modified fork and is not an official upstream release.
+  It is not affiliated with or endorsed by the original StemDeck project.
+
+Commercial use:
+  Apache License 2.0 permits commercial use and redistribution when its
+  conditions are satisfied. This notice does not grant trademark rights or
+  permission to present this fork as an official StemDeck release, official
+  commercial offering, certified build, or upstream-supported product.
+  Distributors remain responsible for retaining LICENSE/NOTICE files and for
+  verifying the licenses of all third-party components included in their
+  specific artifacts.
+
+Modification notice:
+  This fork uses the visible product branding LayerLab and includes
+  local changes for higher-quality stem separation, FFmpeg handling, UI
+  styling, asynchronous queue handling, bass dropout repair, and
+  phase-coherence repair. Additional changes include optional per-stem denoise,
+  progress/ETA surfacing, responsive neon UI refinements, desktop runtime
+  setup hardening, conservative cleanup/maintenance helpers, fork-separated
+  desktop storage paths, fork release update URLs, and optional release
+  signing/notarization hooks.
+  See the Git history for the complete change record.
+
+Third-party dependencies:
+  Runtime dependencies remain licensed by their respective authors. Packaged
+  builds include THIRD_PARTY_NOTICES.txt and generated dependency inventories
+  where available.
+
+Additional runtime helper:
+  imageio-ffmpeg
+  https://github.com/imageio/imageio-ffmpeg
+  License: BSD-2-Clause
+  Used as a portable FFmpeg executable fallback when no system or bundled
+  FFmpeg binary is available.