fix(cli): handle bare /md command without trailing space

Typing /md without a space was falling through to chat instead of
showing usage. Match the exact "/md" token in addition to "/md ".

Signed-off-by: Matt Van Horn <mvanhorn@users.noreply.github.com>
Signed-off-by: Matt Van Horn <455140+mvanhorn@users.noreply.github.com>

Author: mvanhorn

crates/goose-cli/src/session/input.rs

@@ -308,8 +308,8 @@ fn handle_slash_command(input: &str) -> Option<InputResult> {
             println!("{}", console::style("⚠️  Note: /summarize has been renamed to /compact and will be removed in a future release.").yellow());
             Some(InputResult::Compact)
         }
-        s if s.starts_with("/md ") => {
-            let path = s.strip_prefix("/md ").unwrap_or("").trim();
+        s if s == "/md" || s.starts_with("/md ") => {
+            let path = s.strip_prefix("/md").unwrap_or("").trim();
             if path.is_empty() {
                 println!("Usage: /md <file>");
                 Some(InputResult::Retry)