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Feature request: text wrapping filter for changelog templates

Feature request: text wrapping filter for changelog templates: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). I'm putting together a custom changelog template (via the template dir setting) and I'd like the generated CHANGELOG.md to stay within a fixed line width…

The task

I'm putting together a custom changelog template (via the `template_dir` setting) and I'd like the generated `CHANGELOG.md` to stay within a fixed line width — for me around 80 characters — so the raw markdown reads cleanly in a terminal and in code review diffs.

Part of FineEnvs/MiMo-V2.6-RL-harbor-code.