chore: prune unnecessary code (automated weekly cleanup)

[Miyamura80]

Removed unnecessary dead functions and unused variables identified through Vulture static analysis and manual verification, following strictly the conservative UNNECESSARY_CODE_GUIDELINE.md constraints.

Removals:

• init/generate_logo.py (reduce_color_variance): Helper function never used within its own file or elsewhere.
• src/utils/logging_config.py (type_ and tb): Unused variables resulting from exception unpacking replaced with _.

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PR created automatically by Jules for task 5897270814753300085 started by @Miyamura80

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[greptile-apps]

Greptile Summary

This PR performs a conservative dead-code cleanup, removing an unused helper function (reduce_color_variance) and two unused exception-unpacking variables (type_, tb), plus a minor line-wrap reformatting in the file-length check script. All changes are safe and non-breaking.

• init/generate_logo.py: reduce_color_variance is confirmed unused — it was never called within its own file or imported elsewhere. Its removal leaves no gap in the existing generate_logo pipeline.
• src/utils/logging_config.py: type_ and tb from the exception tuple were indeed never referenced after unpacking; only value was used. Replacing them with _ is idiomatic and correct.
• scripts/check_file_length.py: A long print call was reformatted to fit within the project's line-length limit — purely cosmetic, no behavioural change.

Confidence Score: 5/5

• This PR is safe to merge — all changes are verified dead-code removals with no behavioural impact.
• Every removal is confirmed correct: the deleted function was genuinely unused, the suppressed exception variables were never read, and the reformatted print statement is functionally identical. There are no logic changes, no new dependencies, and no test coverage concerns.
• No files require special attention.

Important Files Changed

Filename	Overview
init/generate_logo.py	Removes the unused reduce_color_variance helper function, which was never called within the file or anywhere else in the codebase. Safe removal.
src/utils/logging_config.py	Replaces unused type_ and tb variables from exception unpacking with _. Only value is used downstream, making this a clean, correct cleanup.
scripts/check_file_length.py	Minor line-wrapping of a long print statement to comply with the project's line-length constraints. No logic change.

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