feat: 5x5 entity (27 bodies), terminal viewport up to 250x120

- Entity: 5x5 grid body + 2-cell arm = 27 sub-bodies, radius 0.5
- Terminal: default 200x60, max 250x120 (was 250x80)
- 31 constraints (full grid + arm)
- Spawn height adjusted for 5-tall body

src/render/terminal.rs

@@ -31,9 +31,9 @@ impl TerminalRenderer {
     }
 
     fn detect_size(&mut self) -> io::Result<()> {
-        let (w, h) = term_size().unwrap_or((120, 40));
-        self.width = (w as usize).min(250).max(60);
-        self.height = (h as usize).min(80).max(20);
+        let (w, h) = term_size().unwrap_or((200, 60));
+        self.width = (w as usize).min(250).max(80);
+        self.height = (h as usize).min(120).max(25);
         Ok(())
     }