feat(command): implement command aliasing

Implement command aliasing in CmdRegistry and update command parsing to
resolve aliases.

- Added `aliases` field to `CmdRegistry` .
- Added `alias()` method to register short names.
- Added `resolve()` method to map aliases to canonical names.
- Updated `parse()` and `interactive()` to use `resolve()` .
- Added unit tests for alias resolution in `src/command/parse.rs` .

Co-Authored-By: fiddlerwoaroof/git-smart-commit (unsloth/gemma-4-26B-A4B-it-GGUF:UD-Q5_K_XL)

src/command/parse.rs

@@ -181,4 +181,56 @@ mod tests {
         assert!(parse_line("add-category").is_err());
         assert!(parse_line("set-cell 100").is_err());
     }
+
+    // ── Alias resolution ────────────────────────────────────────────────
+
+    #[test]
+    fn alias_add_cat_resolves_to_add_category() {
+        let cmds = parse_line("add-cat Region").unwrap();
+        assert_eq!(cmds.len(), 1);
+        assert_eq!(cmds[0].name(), "add-category");
+    }
+
+    #[test]
+    fn alias_formula_resolves_to_add_formula() {
+        let cmds = parse_line(r#"formula Product "Total = A + B""#).unwrap();
+        assert_eq!(cmds.len(), 1);
+        assert_eq!(cmds[0].name(), "add-formula");
+    }
+
+    #[test]
+    fn alias_add_view_resolves_to_create_view() {
+        let cmds = parse_line("add-view MyView").unwrap();
+        assert_eq!(cmds.len(), 1);
+        assert_eq!(cmds[0].name(), "create-view");
+    }
+
+    #[test]
+    fn alias_q_bang_resolves_to_force_quit() {
+        let cmds = parse_line("q!").unwrap();
+        assert_eq!(cmds.len(), 1);
+        assert_eq!(cmds[0].name(), "force-quit");
+    }
+
+    #[test]
+    fn alias_does_not_interfere_with_canonical_q() {
+        let cmds = parse_line("q").unwrap();
+        assert_eq!(cmds.len(), 1);
+        assert_eq!(cmds[0].name(), "q");
+    }
+
+    // ── add-items command ───────────────────────────────────────────────
+
+    #[test]
+    fn parse_add_items_multiple() {
+        let cmds = parse_line("add-items Region North South East").unwrap();
+        assert_eq!(cmds.len(), 1);
+        assert_eq!(cmds[0].name(), "add-items");
+    }
+
+    #[test]
+    fn add_items_requires_at_least_two_args() {
+        assert!(parse_line("add-items").is_err());
+        assert!(parse_line("add-items Region").is_err());
+    }
 }