Baseline: full tree snapshot after git repository loss

The previous .git directory was found gutted (only info/ remained), so
history is unrecoverable locally. This commit restores version control
with the tree exactly as it stands: the working app, the preview-tracks
launcher on the artist hero, the scrollable-track-previews design bundle
(docs + approved mockups), and the Phase 0 validation artifacts.

crates/player/examples/wf.rs

@@ -0,0 +1,17 @@
+//! Print an ASCII preview of a file's waveform shape.
+//!   cargo run -p player --example wf -- "C:\path\to\file.flac"
+
+fn main() {
+    let path = std::path::PathBuf::from(std::env::args().nth(1).expect("usage: wf <file>"));
+    let t = std::time::Instant::now();
+    let peaks = player::compute_waveform(&path, 80);
+    println!("{} buckets in {:?}", peaks.len(), t.elapsed());
+    let glyphs = [' ', '▁', '▂', '▃', '▄', '▅', '▆', '▇', '█'];
+    let bars: String = peaks
+        .iter()
+        .map(|&v| glyphs[((v * 8.0) as usize).min(8)])
+        .collect();
+    println!("{bars}");
+    let flat = peaks.iter().filter(|&&v| v > 0.95).count();
+    println!("buckets >0.95: {flat}/{}", peaks.len());
+}