Add -- separator to git diff commands for deleted files

.gitignore

@@ -22,3 +22,6 @@ target
 #  and can be added to the global gitignore or merged into this file.  For a more nuclear
 #  option (not recommended) you can uncomment the following to ignore the entire idea folder.
 #.idea/
+
+# Generated demo output
+demo/demo.ascii

README.md

@@ -14,8 +14,7 @@ A keyboard-driven git file manager for the terminal.
 
 ## The Problem
 
-When working with git, common workflows like staging files, viewing diffs, and editing changed files require typing full file paths repeatedly. Tab completion helps, but with many changed files it's still slow. 
-This can be exacerbated by AI driven workflows as the amount of time reviewing grows substantially relative writing code. 
+AI coding assistants generate changes across many files quickly, shifting the bottleneck from writing code to reviewing it. Staging files, viewing diffs, and editing requires typing full file paths repeatedly. Tab completion helps, but with many changed files it's still slow. 
 
 ## The Solution
 

crates/f/src/f.rs

@@ -189,13 +189,13 @@ fn cmd_diff(id: Option<String>, config: &Config) -> ! {
             &file.abs_path.to_string_lossy(),
         ])
     } else {
-        exec_git(&["diff", &file.abs_path.to_string_lossy()])
+        exec_git(&["diff", "--", &file.abs_path.to_string_lossy()])
     }
 }
 
 fn cmd_staged_diff(id: Option<String>, config: &Config) -> ! {
     let file = require_file(resolve_file(id, config));
-    exec_git(&["diff", "--staged", &file.abs_path.to_string_lossy()])
+    exec_git(&["diff", "--staged", "--", &file.abs_path.to_string_lossy()])
 }
 
 fn cmd_add(id: Option<String>, config: &Config) -> ! {
@@ -283,11 +283,11 @@ fn handle_id_first(id: &str, action: Option<&str>, config: &Config) {
                     &file.abs_path.to_string_lossy(),
                 ]);
             } else {
-                exec_git(&["diff", &file.abs_path.to_string_lossy()]);
+                exec_git(&["diff", "--", &file.abs_path.to_string_lossy()]);
             }
         }
         Some("sd" | "staged-diff") => {
-            exec_git(&["diff", "--staged", &file.abs_path.to_string_lossy()]);
+            exec_git(&["diff", "--staged", "--", &file.abs_path.to_string_lossy()]);
         }
         Some("e" | "v" | "edit") => {
             exec_editor(&file.abs_path.to_string_lossy(), config);
@@ -508,12 +508,12 @@ mod interactive {
                     }
                     'd' => {
                         let _ = Command::new("git")
-                            .args(["diff", &file.abs_path.to_string_lossy()])
+                            .args(["diff", "--", &file.abs_path.to_string_lossy()])
                             .exec();
                     }
                     's' => {
                         let _ = Command::new("git")
-                            .args(["diff", "--staged", &file.abs_path.to_string_lossy()])
+                            .args(["diff", "--staged", "--", &file.abs_path.to_string_lossy()])
                             .exec();
                     }
                     'e' => {