Function validate_spec_output_from_log 

pub fn validate_spec_output_from_log(
    spec_id: &str,
    schema_path: &Path,
    logs_dir: &Path,
) -> Result<Option<ValidationResult>>

Read the agent log file for a spec and validate its output against the schema.

This is useful for batch validation (e.g., in chant lint).

Arguments

• spec_id - The spec ID
• schema_path - Path to the JSON schema file
• logs_dir - Path to the logs directory (typically .chant/logs)

Returns

• Ok(Some(ValidationResult)) if log exists and validation was attempted
• Ok(None) if no log file exists for this spec
• Err if there was an error reading the log or schema