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>

Cargo.toml

@@ -0,0 +1,18 @@
+[package]
+name = "stems"
+version = "0.1.0"
+edition = "2021"
+description = "Multitrack PipeWire recorder: captures every source feeding the default sink into aligned per-source WAV stems"
+license = "MIT"
+repository = "https://project.uhhm.no/bl/stems"
+
+[profile.release]
+lto = true
+codegen-units = 1
+
+[dependencies]
+anyhow = "1"
+pipewire = { version = "0.10", features = ["v0_3_49"] }
+hound = "3.5"
+rtrb = "0.3"
+chrono = { version = "0.4", default-features = false, features = ["clock"] }