[utsab345]

Failure Minimization

Adds stepfork minimize command that uses delta debugging to find minimal reproducible traces.

Usage

stepfork minimize failure.sftrace --entrypoint agent:run --output minimal.sftrace

Implementation

• Failure signature detection (exception, divergence, output mismatch)
• Delta debugging with dependency preservation
• Timeout and nondeterminism handling
• 29 new tests, all passing

Files Changed

• src/stepfork/minimize/ (4 new modules)
• src/stepfork/cli/minimize.py (CLI command)
• docs/minimize.md (user guide)
• Tests in tests/unit/ and tests/integration/