Sync per-pose index and locomotion state across the network

Add PlayerAnimationSync NetworkBehaviour with owner-authoritative
NetworkVariables for pose index and locomotion category (idle/walk/run/fall).
Remote avatars switch their PlayerPoseController into network-controlled mode,
skipping local input, sprint reset, capsule resize and camera framing, and
take pose index plus locomotion externally. Disable pose persistence on
network-driven remotes so foreign avatars can't overwrite the local save.

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

Assets/Scripts/PlayerAnimationSync.cs.meta

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