Initial release: real-time voice changer in pure Rust

Phase-vocoder pitch/formant shifting, 12 presets, effect chain,
noise gate, WAV recording, full-screen TUI (arrow/mouse control)
and a built-in PipeWire/PulseAudio virtual mic (vois.rs).
GPL-3.0-or-later.

scripts/setup_virtual_mic.sh

@@ -0,0 +1,31 @@
+#!/usr/bin/env bash
+# Create the "vois" null sink and expose its monitor as a virtual mic.
+# The default sink is left untouched: vois routes only its own playback
+# stream to the "vois" sink, so other apps keep playing to your real output.
+set -eu
+
+SINK_NAME="vois.rs"
+SINK_DESC="vois.rs virtual mic"
+REMAP_NAME="vois.rs"
+
+# Idempotency check: field 2 of `pactl list short <x>` is the object name.
+if ! pactl list short sinks | awk -v n="${SINK_NAME}" '$2==n' | grep -q .; then
+    pactl load-module module-null-sink \
+        sink_name="${SINK_NAME}" \
+        sink_properties="device.description=${SINK_DESC}"
+    echo "created sink: ${SINK_NAME}"
+else
+    echo "sink already present: ${SINK_NAME}"
+fi
+
+if ! pactl list short sources | awk -v n="${REMAP_NAME}" '$2==n' | grep -q .; then
+    pactl load-module module-remap-source \
+        source_name="${REMAP_NAME}" \
+        master="${SINK_NAME}.monitor"
+    echo "created remapped source: ${REMAP_NAME}"
+else
+    echo "remapped source already present: ${REMAP_NAME}"
+fi
+
+echo "virtual mic source name(s): ${SINK_NAME}.monitor and ${REMAP_NAME}"
+echo 'use "vois.rs" (or "vois.rs.monitor") as your microphone in apps'