Remove monthly pipeline from main

[Yuning598]

Keep chars_ciz_monthly on the dedicated yuning598/chars-ciz-monthly branch as a backup, rather than maintaining the folder on main. This PR only removes that folder from main.

[Copilot]

Pull request overview

This PR removes the chars_ciz_monthly/ pipeline from main, keeping it only on the dedicated backup branch (yuning598/chars-ciz-monthly) as described in the PR.

Changes:

• Deleted the entire chars_ciz_monthly/ folder contents (monthly pipeline scripts + helpers).
• Removed the WRDS SAS macro file that was part of that monthly pipeline tooling.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
chars_ciz_monthly/sue.py	Removed monthly SUE computation script from main.
chars_ciz_monthly/rolling_chars.py	Removed monthly rolling characteristics computation script from main.
chars_ciz_monthly/myre.py	Removed monthly analyst forecast revision (RE) script from main.
chars_ciz_monthly/merge_chars.py	Removed monthly merge step for accounting + satellite characteristics.
chars_ciz_monthly/impute_rank_output.py	Removed monthly impute/rank/output step from main.
chars_ciz_monthly/iclink_ciz.sas	Removed SAS macro used to generate IBES–CRSP link table for the monthly pipeline.
chars_ciz_monthly/functions.py	Removed monthly pipeline shared helpers/constants from main.
chars_ciz_monthly/download_data.py	Removed monthly pipeline WRDS download utility script from main.
chars_ciz_monthly/accounting.py	Removed monthly pipeline accounting characteristics build script from main.
chars_ciz_monthly/abr.py	Removed monthly ABR computation script from main.

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