Module state 

Progress persistence and resume for long-running workflows.

This module defines the data types for checkpointing and the CheckpointBackend trait that persistence engines (e.g. SQLite) implement.

Key features:

• Event log persistence
• Agent result caching
• Resume from last checkpoint
• Run state management

Structs

AgentResultCache

AgentSessionCheckpoint

PhaseSummary

RunCheckpoint

Run state persisted to the backend.

Enums

CheckpointStatus

Traits

CheckpointBackend

Persistence backend for a single run.

Functions

current_timestamp

Helper: current unix timestamp.

list_run_dirs

List all run directory names under the base dir. For SQLite backends, this is derived from the runs table. This helper remains for filesystem-based discovery.