{"title":"Friendlier greeting and add bye helper","body":"## Summary\n\n- `greet` now returns `Hello, <name>!` instead of `hi <name>`\n- Added a `bye` helper that returns `Bye, <name>`\n\n## Testing\n\n- Not run (no test suite exercised for this change)\n- Suggested: type-check `greet.ts` and verify `greet(\"Ada\")` → `Hello, Ada!` and `bye(\"Ada\")` → `Bye, Ada`\n- Suggested: check callers that depend on the previous lowercase `hi ...` output"}
