B2Action_OnBoardStart

• Description
  * ===============
  * Starts boarding a surfboard. Sends an Enter on-board request to the character movement component's on-board handler with the posture supplied by the action data, and waits until that transition completes.
  * ===============
  * Param:
  * S1: PostureId applied when entering the board
  * S2: Board Tag
  * F1: -
  * F2: -
  * Note:
  * OnInit(): Stores Action.S1 as PostureId and clears AnimId.
  * CanStartCondition(): Requires a valid self character and movement component, then asks the on-board handler whether an Enter request with PostureId is currently allowed.
  * OnPlay(): Sends the Enter on-board request with PostureId to the on-board handler; finishes with InvalidSelfEntity if the character or movement component is missing.
  * OnTick(): Finishes the action once the on-board handler is no longer active; finishes with InvalidSelfEntity if the character or movement component is missing.
  * OnCanceled(): Handles cancellation directly instead of leaving it to the handler, since cancellation only happens on despawn and the posture was already switched when the request was sent: rolls the posture back to Swim, stops the current on-board montage and restores the anim transform, then resets the on-board handler.

Property	Type	Description	Metadata
PostureId	FName	Posture applied while boarding is in progress.
AnimId	FName	Animation played while boarding is in progress.
BoardId	FName	Board Tag for boarding. S2.
ActionId	FName	Identifier of this action instance (used for interaction tracking and mission time accounting)
State	EB2ActionState	Current lifecycle state of this action
MergeType	EB2ActionMergeType	Merge type flags for this action (e.g. interaction merge, checked in Finish())
Result	EB2InteractionResult	Result of this action once it stops playing (Finish/Failed/Canceled)
SelfEntityId	FB1EntityId	Entity id performing this action
TargetEntityId	FB1EntityId	Entity id targeted by this action
GrabEntityId	FB1EntityId	Entity id grabbed/carried by self entity for this action
NonTargetLocation	FVector	Location used for script/condition context when there is no target entity
Action	FB1ActionInfo	Action table data (S1/S2/F1/F2, script id lists, etc.) driving this instance
TickCalcValue	float	Accumulated tick delta time since this action started ticking
CurrentNotifyIndex	int32	Index into Action.NotifyScriptIds for the next notify script to run
AsyncLoadAnimInfo	TArray	Animations to async-load for this action's start/notify/tick/finish/cancel scripts
AddActionTimeInterval	float	Interval in seconds between OnTickAddActionExecuteTime() calls
AccumAddActionTime	float	Elapsed time accumulator compared against AddActionTimeInterval
StartActionTickTime	int64	Tick timestamp used to measure elapsed action execution time for mission tracking
ActionKey	FB2ActionKey	Key identifying this action's slot/queue within the interaction system
TimeTaskId	FB1TimeTaskId	Id of the scheduled time task used for delayed Determine/Finish
IsForceCancelable	bool	Whether this action is force-cancelable, copied from Action.IsForceCancelable
IsFirstAction	bool	Marks the first action in an interaction sequence; set on actions[0] by FB2InteractionPlayer::LinkActions(), read by FB2ActionPlayer
bMultiFlag	bool	Set by looping actions (PlayAnim, BookRead, Eat, WaitTalkSequence) once a loop iteration completes; read/reset by FB2ActionPlayer to gate multi-interaction selection
TalkInstanceId	FB1TalkInstanceId	Id of the talk instance this action is linked to, set externally by FB2InteractionPlayer::LinkActions()
TalkSubjectEntityId	FB1EntityId	Entity id of the talk subject linked to this action, set externally by FB2InteractionPlayer::LinkActions()/OnTalkSpaceParamChanged()
bIsWaitFinishEvent	bool	Cached copy of Action.IsWaitFinishAction taken at Init(); read directly by FB2ActionPlayer for sequencing (the IsWaitFinishAction() getter instead reads Action.IsWaitFinishAction live)
AutoInsertType	EB2ActionAutoInsertType	Type of action that was auto-inserted before this one (e.g. WalkTo, ChangePosture)