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.

src/app/states/skirmish.rs

@@ -2,19 +2,19 @@ use crate::app::states::skirmish_states::BoardState;
 
 #[derive(Debug, Clone, PartialEq)]
 pub struct SkirmishState {
-    pub id: usize,
-    pub name: &'static str,
-    pub board: BoardState,
-    pub side_panel: bool,
-    pub turn_counter: u64,
+  pub id: usize,
+  pub name: &'static str,
+  pub board: BoardState,
+  pub side_panel: bool,
+  pub turn_counter: u64,
 }
 
 impl SkirmishState {
-    pub fn tick_update(&mut self) {
-        self.board.advance_turn();
+  pub fn tick_update(&mut self) {
+    self.board.advance_turn();
 
-        // if self.board.is_victory() {}
+    // if self.board.is_victory() {}
 
-        self.turn_counter += 1;
-    }
+    self.turn_counter += 1;
+  }
 }