Pin setuptools <81 to preserve pkg_resources for docxcompose

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Identify the Bug

Addresses feedback on PR #820 regarding setuptools version constraint.

Description of the Change

Added explicit setuptools<81 constraint to requirements/base.txt. The docxcompose dependency requires pkg_resources, which was removed in setuptools v81+.

Alternate Designs

Could pin to a specific setuptools version (e.g., setuptools==80.6.1), but using <81 allows patch updates while preventing the breaking v81+ versions.

Possible Drawbacks

Prevents use of setuptools v81+ features. This is acceptable as pkg_resources compatibility is required for core reporting functionality.

Verification Process

Verified setuptools<81 constraint is present in requirements/base.txt with appropriate inline comment explaining the version ceiling.

Release Notes

Not applicable - internal dependency constraint for pkg_resources compatibility.

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