1. 1. Summary

• Add parameter and return type annotations to all functions in `dictionary.py` (5 functions + 1 inner function) and `jscomment.py` (2 functions)
• `dictionary.py` uses `Any` for `merge_dicts` params since it handles both MutableMapping and non-MutableMapping inputs
• `jscomment.py` accepts `str | bytes` for `_strip_jscomments` matching the existing runtime check
• Part of an incremental effort to add type hints across resmoke Python code

1. 1. Test plan

• [x] All modified files pass `python -m py_compile`
• [ ] Verify resmoke `core` suite still passes with these changes

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