fix: add missing thought_signature field in tools tests

Fixes two test assertions that were missing the new Option<String>
field added to the pending_tools tuple.

Generated with https://github.com/Yeachan-Heo/gajae-code
Co-authored-by: Gajae Code <dev@gajae-code.com>

rust/crates/tools/src/lib.rs

@@ -8106,6 +8106,7 @@ mod tests {
                 "tool-1".to_string(),
                 "read_file".to_string(),
                 "{\"path\":\"src/main.rs\"}".to_string(),
+                None,
             ))
         );
         assert_eq!(
@@ -8114,6 +8115,7 @@ mod tests {
                 "tool-2".to_string(),
                 "grep_search".to_string(),
                 "{\"pattern\":\"TODO\"}".to_string(),
+                None,
             ))
         );
     }