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/Scenes/SampleScene.unity

@@ -1356,7 +1356,7 @@ Animator:
   m_GameObject: {fileID: 341947179}
   m_Enabled: 1
   m_Avatar: {fileID: 0}
-  m_Controller: {fileID: 9100000, guid: db81cb9b04dc81e4bbb493a273d47245, type: 2}
+  m_Controller: {fileID: 0}
   m_CullingMode: 0
   m_UpdateMode: 0
   m_ApplyRootMotion: 0
@@ -3240,6 +3240,7 @@ GameObject:
   - component: {fileID: 1141039639}
   - component: {fileID: 1141039641}
   - component: {fileID: 1141039642}
+  - component: {fileID: 1141039643}
   m_Layer: 0
   m_Name: Player (Variant 1)
   m_TagString: Player
@@ -3336,6 +3337,26 @@ MonoBehaviour:
   wallTopOutBoost: 0.3
   cameraOrbit: {fileID: 0}
   meshOffsetTarget: {fileID: 0}
+--- !u!114 &1141039643
+MonoBehaviour:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 1141039638}
+  m_Enabled: 1
+  m_EditorHideFlags: 0
+  m_Script: {fileID: 11500000, guid: 324ce9a23e6a5144096a195460dd567f, type: 3}
+  m_Name: 
+  m_EditorClassIdentifier: Assembly-CSharp::PlayerPoseController
+  persistPose: 1
+  poseSaveId: 
+  poses:
+  - {fileID: 11400000, guid: 3b59c882f27d0d04a82d2db251af1728, type: 2}
+  - {fileID: 11400000, guid: 1545cfba9b5e06d41ae72c7ec766baaf, type: 2}
+  - {fileID: 11400000, guid: 649ecccdabb7ef9438addcec6663b037, type: 2}
+  defaultPoseIndex: 0
+  cycleKey: 17
 --- !u!1 &1238479929
 GameObject:
   m_ObjectHideFlags: 0