stems: multitrack PipeWire recorder

Records every source feeding the default sink into sample-aligned float WAV
stems plus the sink mix, so sessions can be mixed and mastered later.
Release flow mirrors galdr: tag -> build tarballs on both arches -> Gitea
release -> publish to the uhhm Arch registry (no AUR package).

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

aur/PKGBUILD

@@ -0,0 +1,21 @@
+# Maintainer: Bendik Aagaard Lynghaug <bendik.lynghaug@gmail.com>
+pkgname=stems
+pkgver=0.1.0
+pkgrel=1
+pkgdesc="Multitrack PipeWire recorder: every source feeding the default sink becomes an aligned WAV stem"
+arch=('x86_64' 'aarch64')
+options=('!strip')
+url="https://project.uhhm.no/bl/stems"
+license=('MIT')
+depends=('libpipewire')
+provides=('stems')
+conflicts=('stems-git' 'stems-bin')
+source_x86_64=("stems-v${pkgver}-x86_64.tar.gz::https://project.uhhm.no/bl/stems/releases/download/v${pkgver}/stems-v${pkgver}-x86_64.tar.gz")
+source_aarch64=("stems-v${pkgver}-aarch64.tar.gz::https://project.uhhm.no/bl/stems/releases/download/v${pkgver}/stems-v${pkgver}-aarch64.tar.gz")
+sha256sums_x86_64=('SKIP')
+sha256sums_aarch64=('SKIP')
+
+package() {
+    install -Dm755 stems "$pkgdir/usr/bin/stems"
+    install -Dm644 LICENSE "$pkgdir/usr/share/licenses/$pkgname/LICENSE"
+}