Struct TimelineForker 

pub struct TimelineForker<S: KernelState> {
    pub events: Box<dyn EventStore>,
    pub reducer: Box<dyn Reducer<S>>,
}

Timeline forker: creates alternate execution timelines from checkpoints.

Fields

events: Box<dyn EventStore>

Event store (source of truth).

reducer: Box<dyn Reducer<S>>

Reducer to apply events to state.

Implementations

impl<S: KernelState> TimelineForker<S>

pub fn fork( &self, source_run_id: &RunId, branch_id: RunId, fork_at_seq: Seq, alternate_event: Event, initial_state: S, ) -> Result<ForkResult<S>, KernelError>

Forks the timeline at checkpoint fork_at_seq.

1. Replays source run up to fork_at_seq.
2. Injects alternate_event at the fork point.
3. Continues replaying remaining events under new branch_id.
4. Returns the fork metadata and final state.

pub fn clone_timeline( &self, source_run_id: &RunId, branch_id: RunId, initial_state: S, ) -> Result<ForkResult<S>, KernelError>

Creates a fork that starts fresh (no alternate event) - useful for simulation/audit. This replays the entire run under a new branch_id.