Added comprehensive test coverage for the merger module (124 lines in `merger.test.ts`), covering the in-merge fix from this branch with assertions that verify the corrected behavior. Fusion-Task-Id: FN-3312
Added comprehensive test coverage for the merger module (124 lines in `merger.test.ts`), covering the in-merge fix from this branch with assertions that verify the corrected behavior. Fusion-Task-Id: FN-3312