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/Scripts/PlayerPose.cs

@@ -0,0 +1,28 @@
+using UnityEngine;
+
+/// <summary>
+/// A selectable player pose: an <see cref="AnimationClip"/> held while the player is idle, plus a
+/// y-offset applied to the visual model only while stuck to the ceiling (so the pose hangs at the
+/// right height). The first ScriptableObject in this project.
+///
+/// Named PlayerPose (not Pose) to avoid shadowing the built-in UnityEngine.Pose struct, mirroring
+/// why the controller is PlayerCharacterController and not just "PlayerController".
+/// </summary>
+[CreateAssetMenu(fileName = "NewPose", menuName = "Chameleon/Pose")]
+public class PlayerPose : ScriptableObject
+{
+    [Tooltip("Clip held while the player is idle in this pose (looped if the clip itself loops, " +
+             "otherwise frozen on its last frame). Authored for the paintman generic rig; clips for " +
+             "other hierarchies will not retarget.")]
+    [SerializeField] private AnimationClip clip;
+
+    [Tooltip("Local-up offset added to the visual model ONLY while stuck to the ceiling, so the pose " +
+             "hangs at the right height. Ignored on the ground and on walls. Meters.")]
+    [SerializeField] private float ceilingYOffset;
+
+    /// <summary>Idle clip for this pose (may be null).</summary>
+    public AnimationClip Clip => clip;
+
+    /// <summary>Local-up offset applied to the model only while on the ceiling.</summary>
+    public float CeilingYOffset => ceilingYOffset;
+}