Add rustfmt configuration and reformat code

- Document new Rust formatting standards in AGENTS, CODE_MAP, and
  PROGRESS.
- Add rustfmt.toml with style 2024, 2‑space indents, 100‑char width, LF
  endings.
- Apply consistent 2‑space indentation and ordering across source files.
- Minor clean‑up of imports and whitespace to match the new style.

tests/audio.rs

@@ -1,19 +1,19 @@
 use rodio::Decoder;
 use std::{
-    fs::read,
-    io::{BufReader, Cursor},
+  fs::read,
+  io::{BufReader, Cursor},
 };
 use war_in_tunnels::app::threads::{SoundrackParts, Soundtrack, load_audio};
 
 #[test]
 fn audio_repeats_after_end_of_file() {
-    let data = read("soundtracks/default/calm.ogg").unwrap();
-    let sample_count = Decoder::new(BufReader::new(Cursor::new(data)))
-        .unwrap()
-        .count();
-    assert!(sample_count > 0);
+  let data = read("soundtracks/default/calm.ogg").unwrap();
+  let sample_count = Decoder::new(BufReader::new(Cursor::new(data)))
+    .unwrap()
+    .count();
+  assert!(sample_count > 0);
 
-    let mut source = load_audio(&Soundtrack::Default, &SoundrackParts::Calm);
-    assert_eq!(source.by_ref().take(sample_count).count(), sample_count);
-    assert_eq!(source.take(1024).count(), 1024);
+  let mut source = load_audio(&Soundtrack::Default, &SoundrackParts::Calm);
+  assert_eq!(source.by_ref().take(sample_count).count(), sample_count);
+  assert_eq!(source.take(1024).count(), 1024);
 }