chore: add MIT license, record private-use scope

Add MIT LICENSE file (Cargo.toml already declares MIT). Record in
DECISIONS.md that the open-source publish/rename plan is dropped: the
tool is for personal use, distributed as an Arch package via the private
moonarch repo and used primarily as a Waybar widget.
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2026-06-10 16:38:10 +02:00
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- **Why**: Each headset vendor uses a proprietary HID protocol. No common standard exists. HeadsetControl already has tested implementations for SteelSeries, Logitech, HyperX, Corsair, etc.
- **Tradeoffs**: Porting C code to Rust takes effort, but the protocol logic is the hard part (byte sequences, timing, quirks) — and that's already documented in HeadsetControl's source.
- **How**: Modular backend architecture — each protocol as a separate module behind a common trait. Bragi is the first backend; others follow.
## 2026-06-10 Scope: private use only, revert to MIT (supersedes the three 2026-04-09 decisions)
- **Who**: Dom, F.R.I.D.A.Y.
- **Why**: The open-source publish plan (rename away from "Corsair", multi-protocol backend layer, crates.io, upstream to HeadsetControl) was dropped. The tool is for personal use across Dom's own machines, distributed as an Arch package via the private moonarch repo (Gitea registry at gitea.moonarch.de), used primarily as a Waybar widget.
- **Tradeoffs**: GPLv3 and the rename were only justified by public distribution and porting HeadsetControl (GPLv3) code. With no public release and no GPL-derived code in the tree, copyleft and the trademark rename buy nothing. MIT is simpler and reversible — switch to GPLv3 only if GPL code is later pulled in.
- **How**: Revert license to MIT (Cargo.toml + MIT LICENSE file). Keep the name `corsairctl`. PLAN.md retained as a record of the considered direction, no longer driving work.