Add Doubles Battle Support to Engine#62

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sudo-owen wants to merge 16 commits into

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claude/merge-double-battle-main-EhNdh

Commits on Mar 1, 2026

docs: add implementation plan for doubles battle support
claude
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feat: add doubles battle data structures (GameMode, slot packing, expanded contexts)
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chore: remove accidentally committed doubles-only files
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feat: add doubles battle support to Engine, Validator, and CommitManager
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feat: port doubles tests from double-battle branch and fix matchmaker bug
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feat: add doubles slot 1 execution support to Engine
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fix: enable all 12 remaining doubles tests with Validator, AttackCalculator, and StaminaRegen fixes
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refactor: move doubles validation logic to ValidatorLogic library for inline gas savings
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refactor: unify move-setting, extract game-over check, fix doubles validator gap
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refactor: extract shared helpers to reduce Engine duplication
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Add doubles support for SignedCommitManager + optimize SLOADs
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fix: reconcile doubles code with main branch changes
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chore: update gas snapshots after rebase onto main
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chore: update forge-std submodule pointer
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refactor: unify move-setting through slot-aware _setMoveInternal
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chore: update gas snapshots after move-setting refactor
claude
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