[JohnnyWilson16]

Summary

• Schema Preservation & Execution Layer:
  • Implements SchemaEnvelope for lossless capture/restoration of extension dtypes, MultiIndex hierarchies, and non-monotonic index orders across Polars and DuckDB bridges.
  • Adds PandasEngine, PolarsEngine, and DuckDBEngine with row-survivorship index tracking, defensive unhashable object handling, and Polars streaming engine telemetry.
  • Adds imputation.py with finite-safe float64 matrix extraction, KNN imputation with correlation weighting, and identifier guards.
  • Updates api.py and __init__.py to expose clean, pipeline, plan, and apply.
• Packaging & CI Configuration:
  • Updates pyproject.toml and adds MANIFEST.in.
  • Adds .github/workflows/ci-verification-gates.yml cross-engine parity matrix with --no-cov guardrails and branch coverage gates.
• Verification Suites & Benchmarks:
  • Adds full test suites across extension dtypes, degenerate frames/indices, hostile object columns, streaming telemetry, README claims, and Hypothesis property invariants.
  • Adds artifact audit script (scripts/audit_artifacts.py), mutation testing audit (scripts/run_mutmut_audit.py), ground truth benchmark (benchmarks/run_ground_truth_bench.py), and scale profiling benchmark (benchmarks/run_scale_profile.py).

Verification Results

• Unit & Parity Suite: 20 passed
• Branch Coverage: 90.57% (exceeds 90% threshold)
• Artifact Audit: Clean-room isolated wheel & sdist smoke test passed
• Mutation Testing: 100% killed (36/36 mutants)
• Ground Truth & Scale Benchmarks: Passed

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