BattleXpGrantResult gains a LeveledUp bool set true iff at least one curve
threshold was crossed during the grant (comparing pre-Level to post-Level after
the level-up loop). Callers will gate class_level_up mission emits on this flag
rather than caching pre-state themselves.
No behavior change for existing callers — they read GetXp/TotalXp/Level today
and never check LeveledUp yet. Tests cover: unchanged level → false, single
threshold → true, multi-threshold within one grant → still true, unknown class
guardrail → false.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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