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GROUP_CHAT_MAX_ROUNDS and its four siblings carry over at the values plugin.js shipped, so no rebase inherits a behavior change on top of a rewrite. Making them configurable is live contributor work — #92213 for per-room limits, #96842 for config plus a token budget — and both want the same single seam, so say so where the constants are instead of adding a config hook this PR has no consumer for.