feat(mettagrid): add AlignToCollectiveMutation for direct collective alignment #4957
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This was referenced Jan 17, 2026
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…alignment Add AlignToCollectiveMutation that aligns target to a specific collective by name. Unlike AlignmentMutation (which aligns to actor's collective), this allows direct alignment to any named collective - useful for events that don't have an actor. Python: - AlignToCollectiveMutationConfig with mutation_type="align_to_collective" and collective field - AlignToCollective() helper function - Added to AnyMutation union C++: - AlignToCollectiveMutationConfig struct in handler_config.hpp - AlignToCollectiveMutation class in mutation.hpp with set_collective() method - Added to MutationConfig variant Tests: - test_align_to_collective_mutation.py with creation, helper, serialization tests Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Add AlignToCollectiveMutation that aligns target to a specific collective by name.
Unlike AlignmentMutation (which aligns to actor's collective), this allows direct
alignment to any named collective - useful for events that don't have an actor.
Co-Authored-By: Claude Opus 4.5 noreply@anthropic.com