Module synthetic 

Synthetic data generation for shell completion training

Three strategies:

1. CLI Command Templates - realistic dev command patterns
2. Mutation Engine - variations on real history
3. Coverage-Guided - fill gaps in n-gram coverage

Structs

CommandGenerator

CLI command template generator

CommandMutator

Mutation engine for shell commands

CoverageGuidedGenerator

Coverage-guided generator that fills gaps in n-gram model

CoverageReport

Coverage statistics

SyntheticPipeline

Combined synthetic data pipeline

SyntheticResult

Result of synthetic data generation