counterexample-generator

# Counterexample Generator Systematically generate counterexamples that demonstrate why verification fails. Provides concrete input values, execution traces, and diagnostic information to help understand and fix specification or implementation issues. ## Core Capabilities ### 1. Precondition Violation Detection Generate inputs that violate preconditions: - **Invalid parameter values** - Out-of-range inputs - **Null/undefined references** - Missing required objects - **State violations** - Invalid object states - **Type mismatches** - Incorrect types - **Constraint violations** - Broken business rules ### 2. Postcondition Failure Analysis Find executions where postconditions fail: - **Return value violations** - Wrong return values - **State inconsistencies** - Incorrect final states - **Invariant breaks** - Invariants violated after execution - **Side effect errors** - Unexpected modifications - **Exception failures** - Wrong or missing exceptions ### 3. Invariant Violation Discovery Identify cases where invariants break: - **Class invariant violations** - Object consistency broken - **Loop invariant violations** - Invariant not maintained - **Data structure violations** - Consistency broken - **Temporal violations** - Time-based properties fail - **Concurrency violations** - Race conditions exposed ### 4. Execution Trace Generation Produce detailed execution paths: - **Step-by-step traces** - Line-by-line execution - **State snapshots** - Variable values at each st...