Function validate_checkpoint 

pub fn validate_checkpoint(
    checkpoint: &PipelineCheckpoint,
    current_config: &Config,
    registry: &AgentRegistry,
) -> ValidationResult

Validate a checkpoint before resuming.

Performs comprehensive validation to ensure the checkpoint can be safely resumed:

• Working directory matches
• PROMPT.md hasn’t changed (if checksum available)
• Agent configurations are compatible

Note: File system state validation is handled separately with recovery strategy in the resume flow (see validate_file_system_state_with_strategy).

Arguments

• checkpoint - The checkpoint to validate
• current_config - Current configuration to compare against
• registry - Agent registry for agent validation

Returns

A ValidationResult with any warnings or errors found.