docs(changelog): document v12 -> v13 tab reset and pre-v13 backup
Adds a "Default tab layout sharpened" block between the Safety and Crash-class sections in both yaml and repo.json. Explains the new five-tab structure, calls out that the reset is one-time, that all non-tab settings are preserved, and that the live config is backed up to pluginConfigs/HellionChat.json.pre-v13-backup before the wipe so users can restore manually. The actual code change shipped in the previous commit; this commit is purely the user-facing communication so the in-game migration notification has matching written context.
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