Animate the player: Rukhanka skeletal locomotion (client-derived)

Replace the capsule with a rigged Synty SciFiSpace soldier driven by Rukhanka 2.9 (netcode replication off; animation derived client-side from replicated state). Adds a slim top-down AnimatorController (idle / 2D-strafe locomotion / death) from Synty clips; client-only PlayerAnimationDriveSystem (local CC-velocity + remote position-delta paths); AnimParamMath (+10 EditMode tests); ServerStripAnimationSystem (disables Rukhanka on the server, zero server-side animation). Client.asmdef gains Rukhanka.Runtime/CharacterController/Physics. EditMode 204/204; Play-validated. See DR-022.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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