Add pose-switching system with continuous hold and sprint reset

New PlayerPose ScriptableObject (AnimationClip + ceiling Y-offset) and
PlayerPoseController that drives poses via a PlayableGraph, overriding the
Animator controller. Poses are held continuously (idle, moving, on wall/
ceiling) so cycle and sprint changes show immediately. Sprinting in any
state resets to pose 0. Non-keyed bones fall back to a captured rest pose
so empty/partial clips apply fully. Ceiling Y-offset is folded into the
controller's single mesh-offset writer.

PlayerCharacterController gains IsIdle / IsSprinting / IsOnCeiling /
AnimatorOverridden accessors and SetPoseLocalYOffset; SetAnimatorRunning is
guarded while a pose owns the Animator. Removed obsolete Paintman.controller.

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

Assets/ScriptableObjects/Poses/Pose_TPose.asset

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