fix: return branch name with pr changes

# Motivation

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# Content

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# Testing

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# Please check the following before marking your PR as ready for review

- [ ] I have added tests for my changes
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needed

Author: kopekC

src/codegen/sdk/core/codebase.py

@@ -1527,13 +1527,13 @@ def from_files(
             logger.info("Codebase initialization complete")
             return codebase
 
-    def get_modified_symbols_in_pr(self, pr_id: int) -> tuple[str, dict[str, str], list[str]]:
+    def get_modified_symbols_in_pr(self, pr_id: int) -> tuple[str, dict[str, str], list[str], str]:
         """Get all modified symbols in a pull request"""
         pr = self._op.get_pull_request(pr_id)
         cg_pr = CodegenPR(self._op, self, pr)
         patch = cg_pr.get_pr_diff()
         commit_sha = cg_pr.get_file_commit_shas()
-        return patch, commit_sha, cg_pr.modified_symbols
+        return patch, commit_sha, cg_pr.modified_symbols, pr.head.ref
 
     def create_pr_comment(self, pr_number: int, body: str) -> None:
         """Create a comment on a pull request"""