Behavior-preserving; 231 BattleNode tests green (capture-conformance suite drives
real prod frames, so a wrong constant would fail).
New Sessions/Dispatch/WireKeys.cs holds the 28 inbound-body read keys (orderList /
keyAction / targetList / uList field names). KnownListBuilder, PlayActionsHandler,
EchoHandler, and BattleFrames.ExtractIdxList now read through it instead of repeated
inline strings, so a parse-side typo ("isSelf" vs "IsSelf") can no longer silently
degrade token resolution. Outbound [JsonPropertyName] attributes left as-is (already
single-source per DTO).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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